CN103424656B - Double potentiometer electrical parameter comprehensive detector - Google Patents

Abstract

The invention provides a comprehensive detector for electrical parameters of a double potentiometer, including a first detection unit for detecting the total resistance, zero resistance and synchronous characteristics of a double potentiometer, and a second detection unit for detecting dynamic noise of a double potentiometer. Detection unit, information integrated processing unit for control and information processing, touch display screen for parameter setting and detection result display, indicator light and buzzer for indicating detection status, horn for listening to noise, providing The power supply module of the power supply and the constant voltage source module providing constant voltage; the first and second detection units, and the touch screen are electrically connected to the bidirectional signal of the integrated information processing unit; the indicator light and the buzzer are electrically connected to the signal of the integrated information processing unit ; The horn is electrically connected to the signal of the second detection unit. The invention integrates the detection of total resistance, zero resistance, synchronization and dynamic noise characteristics of a double potentiometer, has high detection accuracy, is convenient to use, can effectively reduce the detection cost of double potentiometer manufacturers, and improve production efficiency.

Description

Double potentiometer electrical parameter comprehensive detector

technical field

The invention relates to the technical field of potentiometer detection equipment, in particular to a comprehensive detector for electrical parameters of a double potentiometer.

Background technique

Manufacturers of dual potentiometers need to detect electrical parameters such as total resistance, zero resistance, synchronization characteristics, and dynamic noise characteristics of dual potentiometers on the production line. At present, enterprises test the electrical parameters of the double potentiometer, and most of them use multiple stations to test the different electrical parameters of the double potentiometer separately. For example: the first station detects the total resistance and zero resistance of the duplex potentiometer; the second station uses a synchronous characteristic tester to detect the synchronous characteristics of the duplex potentiometer; the third station uses 2 dynamic noise testers Detect the dynamic noise of the double potentiometer, etc. There are obvious defects and deficiencies in this method of detecting the electrical parameters of the double-connected potentiometer: first, more testing instruments are required, and most of them are pointer-type testing instruments of pure analog circuits, and the accuracy is low; The testers at each station need to insert the double potentiometer into the special fixture for corresponding measurement, and then pull out the double potentiometer and hand it over to the next process to continue testing, which seriously reduces the work efficiency; the third is that it requires more labor, which increases the cost for the enterprise. Larger labor cost burden.

Contents of the invention

The purpose of the present invention is: to overcome the deficiencies of the prior art, to provide a low cost, convenient and intuitive to use, high precision and the total resistance, zero resistance, synchronization and dynamic noise characteristics of the dual potentiometer can be fully realized by one operation. A comprehensive detector capable of measuring electrical parameters of dual potentiometers.

The technical solution of the present invention is: the double-connected potentiometer electric parameter comprehensive detector of the present invention, its structural characteristics are: comprising a first detection unit, a second detection unit, an information integrated processing unit, a touch display screen, an indicator light, a buzzer Inverter, power module, constant voltage source module and speaker;

The above-mentioned first detection unit is provided with first to fourth input interface terminals, signal input and output terminals, first to fourth power supply terminals and first to third constant voltage input terminals; the second detection unit is provided with a first input interface terminal, the second input interface terminal, signal input and output terminals, horn signal output terminals and the first to third power supply terminals; Communication terminal, indicator light control terminal, buzzer control terminal and power supply terminal; the touch screen has a signal communication terminal and a power supply terminal; the indicator light has a control signal input terminal and a power supply terminal; the buzzer has a control signal input terminal and a power supply terminal; the power supply module is provided with a power supply input terminal and the first to fourth power supply output terminals; the constant voltage source module is provided with a power supply input terminal and the first to third constant voltage output terminals; the speaker is provided with a signal input terminal;

The first detection signal communication terminal of the information comprehensive processing unit is electrically connected with the signal input and output terminals of the first detection unit with bidirectional signal; the second detection signal communication terminal of the information comprehensive processing unit is electrically connected with the signal input and output terminal of the second detection unit. Connection; the signal communication terminal of the touch display screen is electrically connected with the human-computer interaction signal communication terminal of the integrated information processing unit; the control signal input terminal of the indicator light is electrically connected with the signal control terminal of the indicator light control terminal of the integrated information processing unit; the buzzer The control signal input end of the control signal is electrically connected with the buzzer control end signal of the information integrated processing unit; the signal input end of the horn is electrically connected with the horn signal output end of the second detection unit;

The first to fourth power supply terminals of the first detection unit are respectively electrically connected to the first to fourth power supply output terminals of the power supply module; the first to third constant voltage input terminals of the first detection unit are respectively corresponding to the constant voltage power supply module The first to third constant voltage output terminals of the second detection unit are electrically connected to the first to third power supply terminals of the second detection unit, respectively, and are respectively electrically connected to the first to third power supply output terminals of the power supply module; the power supply terminals of the information integrated processing unit, The power supply end of the touch display screen, the power supply end of the indicator light and the power supply end of the buzzer are all electrically connected to the first power output end of the power supply module; the power input end of the constant voltage source module is electrically connected to the fourth power output end of the power supply module. connect;

When in use, the power input terminal of the power supply module is connected to the AC 220V mains; the first and second input interface terminals of the first detection unit correspond to a fixed one of the first potentiometer Ra of the dual potentiometer Wx to be detected respectively. The terminal and the sliding terminal are electrically connected; the third and fourth input interface terminals of the first detection unit are respectively electrically connected to a fixed terminal and a sliding terminal of the second potentiometer Rb of the double potentiometer Wx; the second detection unit The first input interface end of the second detection unit is electrically connected to the sliding end of the first potentiometer Ra; the second input interface end of the second detection unit is electrically connected to the sliding end of the second potentiometer Rb; the first potentiometer Ra and the second potential The other fixed terminal of the device Rb is grounded.

A further solution is: the first power output terminal of the above-mentioned power supply module outputs +5V power supply; the second power supply output terminal of the power supply module outputs +12V power supply; the third power supply output terminal of the power supply module outputs -12V power supply; Four power output terminals output +18V power supply;

The first constant voltage output terminal of the constant voltage source module outputs a +10V constant voltage; the second constant voltage output terminal of the constant voltage source module 8 outputs a +5V constant voltage; the third constant voltage output terminal of the constant voltage source module 8 outputs +0.1V V constant voltage.

A further solution is: the above-mentioned first detection unit includes a first detection module, a second detection module, an A/D conversion module and a single-chip microcomputer control processing module;

The above-mentioned first detection module and second detection module are respectively provided with voltage measurement control signal input terminals, current measurement control signal input terminals, first to third range control signal input terminals, total resistance signal output terminals, zero resistance/stroke Signal output terminal, open circuit signal output terminal, first to fourth power supply terminals, and first to third constant voltage input terminals; the A/D conversion module is provided with a first total resistance signal input terminal, a first zero resistance/stroke signal input Terminal, the second total resistance signal input terminal, the second zero resistance/stroke signal input terminal, signal communication terminal, the first to the third power supply terminal; the single-chip control processing module is provided with a voltage measurement control signal output terminal and a current measurement control signal output terminal terminal, the first to the third range control signal output terminal, the first open-circuit signal input terminal, the second open-circuit signal input terminal, the internal communication terminal, the external communication terminal and the power supply terminal;

The voltage measurement control signal input terminal of the first detection module and the voltage measurement control signal input terminal of the second detection module are all electrically connected with the voltage measurement control signal output terminal signal of the single-chip microcomputer control processing module; the first detection module current measurement control signal input terminal and The current measurement control signal input terminals of the second detection module are all electrically connected with the current measurement control signal output terminals of the single-chip microcomputer control processing module; The control signal input terminals to the third range are respectively correspondingly connected with the first to the third range control signal output terminals of the single-chip microcomputer control processing module;

The first total resistance signal input end and the second total resistance signal input end of the A/D conversion module are respectively corresponding to the total resistance signal output end of the first detection module and the total resistance signal output end signal of the second measurement module; A The first zero-resistance/stroke signal input terminal and the second zero-resistance/stroke signal input terminal of the /D conversion module correspond to the zero-resistance/stroke signal output terminal of the first detection module and the zero-resistance/stroke signal of the second detection module respectively Electrical connection of the output signal;

The first open-circuit signal input terminal and the second open-circuit signal input terminal of the single-chip microcomputer control processing module are respectively corresponding to the open-circuit signal output terminal of the first detection module and the open-circuit signal output terminal signal of the second detection module are electrically connected; The internal communication terminal is electrically connected to the signal communication terminal of the A/D conversion module for bidirectional signals; the external communication terminal of the single-chip microcomputer control processing module is the signal input and output terminal of the above-mentioned first detection unit;

The first power supply terminal of the first detection module, the first power supply terminal of the second detection module, the first power supply terminal of the A/D conversion module and the power supply terminal of the single-chip microcomputer control processing module jointly constitute the first power supply terminal of the first detection unit; The second power supply terminal of the first detection module, the second power supply terminal of the second detection module and the second power supply terminal of the A/D conversion module together constitute the second power supply terminal of the first detection unit; the third power supply of the first detection module Terminal, the third power supply terminal of the second detection module and the third power supply terminal of the A/D conversion module together constitute the third power supply terminal of the first detection unit; the fourth power supply terminal of the first detection module and the first detection module of the second detection module The four power supply terminals jointly constitute the fourth power supply terminal of the first detection unit; the first to third constant voltage input terminals of the first detection module and the second detection module jointly constitute the first to third constant voltage input terminals of the first detection unit .

A further solution is: the above-mentioned first detection module includes a first range selection module, a first detection mode selection switch, a first constant voltage measurement total resistance module, a first constant current measurement zero resistance/stroke module and a first open circuit detection module ;

The first range selection module is provided with first to third range control signal input terminals, a first voltage signal output terminal, a second voltage signal output terminal, a first power supply terminal, a second power supply terminal, a constant voltage input terminal and a constant voltage output end; the first detection mode selection switch has 14 connection pins in total from 1 to 14; the first constant voltage measuring total resistance module is provided with a first voltage signal input end, a second voltage signal input end, a detection signal output end, a first The power supply terminal and the second power supply terminal; the first constant current measuring zero resistance/stroke module is provided with a constant voltage input terminal, a current output terminal, a voltage signal input terminal and a detection signal output terminal; the first open circuit detection module is provided with a constant voltage input terminal , signal input terminal and signal output terminal;

The first voltage signal input end of the first constant voltage measuring total resistance module is electrically connected with the first voltage signal output end of the first range selection module; the second voltage signal input end of the first constant voltage measuring total resistance module, the first range The second voltage signal output terminal of the selection module and the No. 2 terminal of the first detection mode selection switch are in line; the No. 1 terminal of the first detection mode selection switch, the No. 11 terminal and a fixed connection of the first potentiometer Ra Terminals are in line; No. 10 terminal of the first detection mode selection switch is electrically connected to the constant voltage output terminal of the first range selection module; No. 3 terminal, No. 9 terminal of the first detection mode selection switch and the first constant current The current output terminals of the measuring zero resistance/travel module are collinear; the No. 4 and No. 8 connecting pins of the first detection mode selection switch, the voltage signal input terminals of the first constant current measuring zero resistance/travel module and the first potentiometer The sliding terminal of Ra is collinear; the signal input terminal of the first open circuit detection module is electrically connected with the detection signal output terminal of the first constant voltage measuring total resistance module;

The No. 12 terminal pin and the No. 13 terminal pin of the first detection mode selection switch jointly constitute the voltage measurement control signal input end of the first detection module; the No. 5 terminal pin and the No. 6 terminal pin of the first detection mode selection switch jointly constitute the The current measurement control signal input terminal of the first detection module; the first to third range control signal input terminals of the first range selection module are the first to third range control signal input terminals of the first detection module; the first range selection The first power supply terminal of the module is the first power supply terminal of the first detection module; the first power supply terminal of the first constant voltage measuring total resistance module is the second power supply terminal of the first detection module; the first constant voltage measuring total resistance The second power supply terminal of the module is the third power supply terminal of the first detection module; the second power supply terminal of the first range selection module is the fourth power supply terminal of the first detection module; the constant voltage input terminal of the first range selection module That is, the first constant voltage input end of the first detection module; the constant voltage input end of the first constant current measurement zero resistance/stroke module is the second constant voltage input end of the first detection module; the constant voltage input end of the first open circuit detection module The voltage input end is the third constant voltage input end of the first detection module; the detection signal output end of the first constant voltage measurement total resistance module is the total resistance signal output end of the first detection module; the first constant current measurement zero resistance The detection signal output end of the /stroke module is the zero resistance/stroke signal output end of the first detection module; the signal output end of the first open circuit detection module is the open circuit signal output end of the first detection module.

The second detection module of the first detection unit includes a second range selection module, a second detection mode selection switch, a second constant voltage measurement total resistance module, a second constant current measurement zero resistance/stroke module and a second open circuit detection module; The functions of each module of the two detection modules are identical with the corresponding module functions of the first detection module; the mutual electrical connection modes of each module of the second detection module and the corresponding electrical connection mode with the A/D conversion module and the single-chip microcomputer control processing module Same as the first detection module. When the second detection module is in use, it is electrically connected with the second potentiometer Rb.

A further solution is: the first range selection module of the above-mentioned first detection module includes 3 relay switches and 3 precision reference resistors with different resistance values; the first detection mode selection switch is a four-way analog switch of the CD4066 model; the single-chip microcomputer control The core device of the processing module is a single-chip microcomputer of the STC90C54RD type.

A further scheme is: the above-mentioned second detection unit includes a first preamplifier filter circuit, a first mid-amplifier circuit, a first peak detection circuit, a second preamplifier filter circuit, a second mid-amplifier circuit, a second Peak detection circuit, microcontroller processing circuit and noise sampling and power amplifier circuit;

The above-mentioned first preamplifier filter circuit, the first middle amplifier circuit, the first peak detection circuit, the second preamplifier filter circuit, the second middle amplifier circuit and the second peak detector circuit are respectively provided with signal input terminals , a signal output terminal, a first power supply terminal and a second power supply terminal; the single-chip processing circuit is provided with a first signal input terminal, a second signal input terminal, a communication terminal and a power supply terminal; the noise sampling and power amplifier circuit is provided with a first signal input terminal , a second signal input terminal, a signal output terminal, a first power supply terminal and a second power supply terminal;

The signal input end of the first preamplification filter circuit is the first input interface end of the above-mentioned second detection unit; the signal input end of the first intermediate amplifier circuit is electrically connected with the signal output end of the first preamplifier filter circuit ; The signal input end of the first peak detection circuit is electrically connected to the signal output end of the first intermediate amplifier circuit;

The signal input end of the second preamplification filter circuit is the second input interface end of the above-mentioned second detection unit; the signal input end of the second intermediate amplifier circuit is electrically connected with the signal output end of the second preamplifier filter circuit ; The signal input end of the second peak detection circuit is electrically connected with the signal output end of the second intermediate amplifier circuit;

The first signal input end of the single-chip processing circuit is electrically connected with the signal output end of the first peak detection circuit; the second signal input end of the single-chip processing circuit is electrically connected with the signal output end of the second peak detection circuit; the communication end of the single-chip processing circuit It is the signal input and output ends of the above-mentioned second detection unit; the first signal input end of the noise sampling and power amplifier circuit is electrically connected with the signal output end of the first intermediate amplifier circuit; the second signal input end of the noise sampling and power amplifier circuit It is electrically connected to the signal output end of the second mid-amplification circuit; the signal output end of the noise sampling and power amplifier circuit is the horn signal output end of the above-mentioned second detection unit;

The power end of the single-chip processing circuit is the first power end of the second detection unit; the first preamplifier filter circuit, the first mid-amplifier circuit, the first peak detection circuit, the second preamplifier filter circuit, the first Two intermediate amplifier circuits, the second peak detection circuit, and the first power supply end of the noise sampling and power amplifier circuit together constitute the second power end of the second detection unit; the first preamplifier filter circuit, the first intermediate amplifier circuit , the first peak detection circuit, the second preamplifier filter circuit, the second middle amplifier circuit, the second peak detection circuit and the second power supply end of the noise sampling and power amplifier circuit together constitute the third power supply end of the second detection unit.

A further solution is: the core component of the single-chip microcomputer processing circuit of the second detection unit is a single-chip microcomputer of the STC12C5410AD model.

A further solution is: the core device of the above-mentioned integrated information processing unit is a single-chip microcomputer of the STC12C5A60S2 type.

The present invention has positive effects: (1) The dual potentiometer electrical parameter comprehensive detector of the present invention can integrate the total resistance, zero resistance, synchronization characteristics and dynamic noise characteristics detection of the dual potentiometer, so that it can effectively Reduce the testing equipment and labor on the production line of the enterprise, greatly save the cost of the enterprise and improve the production efficiency of the enterprise. (2) The dual potentiometer electrical parameter comprehensive detector of the present invention can conveniently pre-set parameters before detection by setting a touch display screen, and can intuitively display relevant technical parameters and curves during the detection process, and the detection personnel can From the displayed data and graphics, it is quick and convenient to judge whether the relevant indicators are qualified or not. (3) The dual potentiometer electrical parameter comprehensive detector of the present invention can clearly prompt the inspector whether the index of the detected dual potentiometer is qualified by setting the buzzer and the indicator light, and by setting the horn, it can detect the double potentiometer When using a potentiometer, skilled inspectors can judge whether the dynamic noise index of the double potentiometer is qualified by the sound from the horn, which can greatly improve work efficiency. (4) The dual potentiometer electric parameter comprehensive detector of the present invention is combined with an analog circuit and a single-chip microcomputer. Compared with the detection equipment with a full analog circuit, the detection accuracy has been significantly improved.

Description of drawings

Fig. 1 is a schematic block diagram of the circuit configuration of the present invention, also shows the electric connection relationship with the first potentiometer Ra of the detected dual potentiometer Wx and the second potentiometer Rb among the figure;

Fig. 2 is a schematic block diagram of the circuit configuration of the first detection unit in Fig. 1; Also shown in the figure with the first potentiometer Ra and the second potentiometer Rb of the detected dual potentiometer Wx The electrical connection relationship;

Fig. 3 is a schematic block diagram of the circuit configuration of the second detection unit in Fig. 1;

Fig. 4 is the parameter setting interface diagram when the present invention is used for detection displayed on the touch screen in Fig. 1;

Fig. 5 is the interface diagram displayed on the touch screen of the present invention after setting parameters and before starting detection;

Fig. 6 is a diagram of the detection results displayed on the touch screen after the detection of a type of double potentiometer by the present invention is completed.

The reference signs in the above-mentioned accompanying drawings are as follows:

the first detection unit 1,

The first detection module 11, the first range selection module 111, the first detection mode selection switch 112, the first constant voltage measurement total resistance module 113, the first constant current measurement zero resistance/stroke module 114, the first open circuit detection module 115,

The second detection module 12, the second range selection module 121, the second detection mode selection switch 122, the second constant voltage measurement total resistance module 123, the second constant current measurement zero resistance/stroke module 124, the second open circuit detection module 125,

A/D conversion module 13, single-chip microcomputer control processing module 14;

The second detection unit 2, the first preamplifier filter circuit 21, the first mid-amplifier circuit 22, the first peak detection circuit 23; the second preamplifier filter circuit 24, the second mid-amplifier circuit 25, the second peak value Detection circuit 26; Single-chip microcomputer processing circuit 27, noise sampling and power amplifier circuit 28;

Integrated information processing unit 3, touch screen 4, indicator light 5, buzzer 6, power module 7, constant voltage source module 8, speaker 9;

Double potentiometer Wx, the first potentiometer Ra, the second potentiometer Rb.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

(Example 1)

See Fig. 1, the dual potentiometer electrical parameter comprehensive detector of the present embodiment is used for the detection and testing of the total resistance, zero resistance, dynamic noise and synchronous characteristics of the dual potentiometer Wx of the dual potentiometer Wx, the dual potentiometer The device Wx is composed of a coaxial first potentiometer Ra and a second potentiometer Rb, both of which have two fixed terminals and one sliding terminal.

The dual potentiometer electrical parameter comprehensive detector of this embodiment is mainly composed of a first detection unit 1, a second detection unit 2, an information integrated processing unit 3, a touch display screen 4, an indicator light 5, a buzzer 6, and a power supply module. 7. The constant voltage source module 8 and the casing are composed. The housing is not shown in Figure 1.

The first detection unit 1, the second detection unit 2, the integrated information processing unit 3, the power supply module 7 and the constant voltage source module 8 are all arranged in the casing; the touch display screen 4, the indicator light 5, the buzzer 6 and the horn 9 are set on the shell.

The first detection unit 1 is provided with first to fourth input interface terminals, signal input and output terminals, first to fourth power supply terminals and first to third constant voltage input terminals; the second detection unit 2 is provided with a first input interface end, the second input interface end, the signal input and output end, the horn signal output end, and the first to third power supply ends; the integrated information processing unit 3 is provided with a first detection signal communication end, a second detection signal communication end, human-computer interaction Signal communication terminal, indicator light control terminal, buzzer control terminal and power supply terminal; touch display screen 4 is provided with signal communication terminal and power supply terminal; indicator light 5 is provided with control signal input terminal and power supply terminal; buzzer 6 is provided with control signal input terminal and power supply terminal; power supply module 7 is provided with power supply input terminal and first to fourth power supply output terminal; constant voltage source module 8 is provided with power supply input terminal and first to third constant voltage output terminal; speaker 9 is provided with There is a signal input terminal.

The first and second input interface ends of the first detection unit 1 are respectively corresponding to a fixed terminal and a sliding end of the first potentiometer Ra of the double potentiometer Wx when used; the third and the sliding ends of the first detection unit 1 When the fourth input interface is in use, it is respectively electrically connected to a fixed terminal and a sliding terminal of the second potentiometer Rb of the dual potentiometer Wx; the first to fourth power supply terminals of the first detection unit 1 are respectively corresponding to the power supply module The first to fourth power supply output terminals of 7 are electrically connected; the first to third constant voltage input terminals of the first detection unit 1 are respectively electrically connected to the first to third constant voltage output terminals of the constant voltage source module 8 . The other fixed terminal of the first potentiometer Ra and the other fixed terminal of the second potentiometer Rb are both grounded.

The first input interface end of the second detection unit 2 is electrically connected with the sliding end of the first potentiometer Ra of the double potentiometer Wx when in use; the second input interface end of the second detection unit 2 is connected with the double potentiometer Wx when it is in use The sliding end of the second potentiometer Rb is electrically connected; the first to third power supply terminals of the second detection unit 2 are respectively electrically connected to the first to third power supply output terminals of the power module 7 .

The first detection signal communication terminal of the information comprehensive processing unit 3 is electrically connected with the signal input and output terminals of the first detection unit 1 with bidirectional signals; the second detection signal communication terminal of the information comprehensive processing unit 3 is connected with the signal input and output of the second detection unit 2 The terminals are electrically connected with bidirectional signals; the power supply terminal of the information integrated processing unit 3 is electrically connected with the first power supply output terminal of the power supply module 7 .

The signal communication end of the touch screen 4 is electrically connected with the human-computer interaction signal communication end of the integrated information processing unit 3 for bidirectional signals; the power end of the touch screen 4 is electrically connected with the first power output end of the power module 7 .

The control signal input end of the indicator light 5 is electrically connected to the signal control end of the indicator light of the integrated information processing unit 3 ; the power supply end of the indicator light 5 is electrically connected to the first power output end of the power module 7 .

The control signal input terminal of the buzzer 6 is electrically connected to the buzzer control terminal signal of the information integrated processing unit 3 ; the power supply terminal of the buzzer 6 is electrically connected to the first power output terminal of the power module 7 .

The power input end of power supply module 7 is connected with AC 220V mains when using; the first power output end of power supply module 7 outputs +5V power; the second power output end of power supply module 7 outputs +12V power; The three power output terminals output -12V power; the fourth power output terminal of the power module 7 outputs +18V power.

The power input end of the constant voltage source module 8 is electrically connected to the fourth power output end of the power supply module 7; the first constant voltage output end of the constant voltage source module 8 outputs a +10V constant voltage; the second constant voltage of the constant voltage source module 8 The output end outputs a constant voltage of +5V; the third constant voltage output end of the constant voltage source module 8 outputs a constant voltage of +0.1V.

The signal input end of the horn 9 is electrically connected with the horn signal output end of the second detection unit 2 .

Referring to FIG. 2 , the first detection unit 1 is mainly composed of a first detection module 11 , a second detection module 12 , an A/D conversion module 13 and a single-chip microcomputer control processing module 14 . The first detection unit 1 is used to detect the total resistance, zero resistance and synchronous characteristics of the first potentiometer Ra and the second potentiometer Rb of the double potentiometer Wx.

The first detection module 11 and the second detection module 12 are respectively provided with voltage measurement control signal input terminals, current measurement control signal input terminals, first to third range control signal input terminals, total resistance signal output terminals, zero resistance/stroke Signal output terminal, open circuit signal output terminal, first to fourth power supply terminals and first to third constant voltage input terminals; A/D conversion module 13 is provided with a first total resistance signal input terminal, a first zero resistance/stroke signal Input terminal, the second total resistance signal input terminal, the second zero resistance/stroke signal input terminal, signal communication terminal, the first to the third power supply terminal; the single-chip microcomputer control processing module 14 is provided with voltage measurement control signal output terminal, current measurement control Signal output terminals, first to third range control signal output terminals, first open circuit signal input terminal, second open circuit signal input terminal, internal communication terminal, external communication terminal and power supply terminal.

The voltage measurement control signal input end of the first detection module 11 and the second detection module 12 are all electrically connected with the voltage measurement control signal output terminal signal of the single-chip microcomputer control processing module 14; the current measurement of the first detection module 11 and the second detection module 12 The control signal input ends are all connected with the current measurement control signal output end signal of the single-chip microcomputer control processing module 14; The first to third range control signal output ends of the processing module 14 are electrically connected to each other.

The first total resistance signal input end and the second total resistance signal input end of the A/D conversion module 13 correspond to the total resistance signal output end of the first detection module 11 and the total resistance signal output end signal voltage of the second measurement module 12 respectively. Connection; the first zero resistance/stroke signal input end and the second zero resistance/stroke signal input end of the A/D conversion module 13 correspond to the zero resistance/stroke signal output end of the first detection module 11 and the second detection module 12 respectively The zero-resistance/travel signal output terminal signal is electrically connected.

The first open-circuit signal input end and the second open-circuit signal input end of the single-chip microcomputer control processing module 14 are respectively corresponding to the open-circuit signal output end of the first detection module 11 and the open-circuit signal output end signal of the second detection module 12; The internal communication terminal of the module 14 is electrically connected with the signal communication terminal of the A/D conversion module 13 for bidirectional signals; the external communication terminal of the single-chip control processing module 14 is the signal input and output terminal of the aforementioned first detection unit 1 .

The first power supply terminal of the first detection module 11, the first power supply terminal of the second detection module 12, the first power supply terminal of the A/D conversion module 13 and the power supply terminal of the single-chip microcomputer control processing module 14 constitute the first detection unit 1 together. The first power supply terminal, which connects the +5V power supply output by the first power supply output terminal of the power supply module 7; the second power supply terminal of the first detection module 11, the second power supply terminal of the second detection module 12 and the A/D conversion module 13 The second power supply terminal of the first detection unit 1 jointly constitutes the second power supply terminal, which is connected to the +12V power supply output by the second power supply output terminal of the power supply module 7; the third power supply terminal of the first detection module 11, the second detection module The third power supply end of 12 and the third power supply end of A/D conversion module 13 jointly constitute the third power supply end of the first detection unit 1, which is connected to the -12V power supply output by the third power supply output end of the power supply module 7; the first The fourth power supply terminal of the detection module 11 and the fourth power supply terminal of the second detection module 12 jointly constitute the fourth power supply terminal of the first detection unit 1, which is connected to the +18V power supply output by the fourth power supply output terminal of the power supply module 7; The first constant voltage input end of the first detection module 11 and the second detection module 12 jointly constitute the first constant voltage input end of the first detection unit 1, which is connected to the +10V output from the first constant voltage output end of the constant voltage source module 8 Constant voltage; the second constant voltage input end of the first detection module 11 and the second detection module 12 jointly constitute the second constant voltage input end of the first detection unit 1, which is connected to the second constant voltage output end of the constant voltage source module 8 Output +5V constant voltage; the third constant voltage input terminal of the first detection module 11 and the second detection module 12 jointly constitute the third constant voltage input terminal of the first detection unit 1, which is connected to the third constant voltage source module 8 The +0.1V constant voltage output from the constant voltage output terminal.

Still see Fig. 2, the first detection module 11 of the first detection unit 1 is mainly composed of a first range selection module 111, a first detection mode selection switch 112, a first constant voltage measuring total resistance module 113, a first constant current measuring zero resistance The /travel module 114 and the first open circuit detection module 115 are composed.

The first range selection module 111 is provided with first to third range control signal input terminals, a first voltage signal output terminal, a second voltage signal output terminal, a first power supply terminal, a second power supply terminal, a constant voltage input terminal and a constant voltage Output terminal; the first constant voltage measurement total resistance module 113 is provided with a first voltage signal input terminal, a second voltage signal input terminal, a detection signal output terminal, a first power supply terminal and a second power supply terminal; the first constant current measurement zero resistance The stroke module 114 is provided with a constant voltage input terminal, a current output terminal, a voltage signal input terminal and a detection signal output terminal; the first open circuit detection module 115 is provided with a constant voltage input terminal, a signal input terminal and a signal output terminal.

The first detection mode selection switch 112 preferably adopts a four-way bidirectional analog switch model CD4066 in this embodiment, which is internally packaged with 4 independent analog switches, each switch has an input terminal, an output terminal and a control terminal, and it has 1 to 2 There are 14 wiring pins in total on No. 14; among them, No. 1, No. 2 and No. 13 pins are 3 wiring pins of an analog switch, and No. 13 pin is a control pin; No. 10, No. 11 and No. 12 are the pins of an analog switch. 3 wiring pins, pin 12 is the control pin; pins 3, 4 and 5 are 3 wiring pins of an analog switch, pin 5 is the control pin; pins 6, 8 and 9 are an analog switch There are 3 wiring pins of the switch, and pin 6 is the control pin.

The first voltage signal input end of the first constant voltage measuring total resistance module 113 is electrically connected with the first voltage signal output end of the first range selection module 111; the second voltage signal input end of the first constant voltage measuring total resistance module 113, The second voltage signal output terminal of the first range selection module 111 and the No. 2 connection pin of the first detection mode selection switch 112 are in line; the No. 1 connection pin, the No. 11 connection pin of the first detection mode selection switch 112 and the first potential A fixed terminal of the device Ra is collinear; the No. 10 terminal of the first detection mode selection switch 112 is electrically connected to the constant voltage output terminal of the first range selection module 111; the No. 3 terminal of the first detection mode selection switch 112, Pin No. 9 and the current output terminal of the first constant current measuring zero resistance/stroke module 114 are in line; pin No. 4 of the first detection mode selection switch 112, pin No. The voltage signal input terminal of the module 114 and the sliding terminal of the first potentiometer Ra are collinear; the signal input terminal of the first open circuit detection module 115 is electrically connected with the detection signal output terminal of the first constant voltage measuring total resistance module 113 .

No. 12 connection pins and No. 13 connection pins of the first detection mode selection switch 112 jointly constitute the voltage measurement control signal input end of the first detection module 11; No. 5 connection pins and No. 6 connection pins of the first detection mode selection switch 112 The connecting pins together constitute the current measurement control signal input end of the first detection module 11; the first to third range control signal input ends of the first range selection module 111 are the first to third range control signals of the first detection module 11 Input terminal; the first power supply terminal of the first range selection module 111 is the first power supply terminal (+5V) of the first detection module 11; the first power supply terminal of the first constant voltage measuring total resistance module 113 is the first detection The second power supply terminal (+12V) of the module 11; the second power supply terminal of the first constant voltage measuring total resistance module 113 is the third power supply terminal (-12V) of the first detection module 11; the first range selection module 111 The second power supply terminal is the fourth power supply terminal (+18V) of the first detection module 11; the constant voltage input terminal of the first range selection module 111 is the first constant voltage input terminal (+10V constant voltage) of the first detection module 11 voltage); the constant voltage input terminal of the first constant current measuring zero resistance/stroke module 114 is the second constant voltage input terminal (+5V constant voltage) of the first detection module 11; the constant voltage input terminal of the first open circuit detection module 115 terminal is the third constant voltage input terminal (+0.1V constant voltage) of the first detection module 11; the detection signal output terminal of the first constant voltage measurement total resistance module 113 is the total resistance signal output terminal of the first detection module 11 The detection signal output end of the first constant current measurement zero resistance/stroke module 114 is the zero resistance/stroke signal output end of the first detection module 11; the signal output end of the first open circuit detection module 115 is the first detection module 11 The open circuit signal output terminal.

The first range selection module 111 of the first detection module 11 mainly includes three relay switches and three precision reference resistors with different resistance values, or three sampling resistors with different resistance values. A relay switch and a sampling resistor form a range selection unit. The single-chip microcomputer control processing module 14 selects the corresponding sampling resistor to be connected in series with the measured first potentiometer Ra by controlling the on-off of the corresponding relay switch, so as to realize the selection of the measuring range. The single-chip microcomputer control processing module 14 selects the detection of the total resistance, zero resistance and stroke of the first potentiometer Ra by controlling the first detection mode selection switch 112 to be turned on or off. The first constant voltage measuring total resistance module 113 applies a constant voltage of +10V to the first potentiometer Ra to be tested, and the generated current flows through the sampling resistor of the first range selection module 111, and the voltage on the sampling resistor is amplified and sent to The A/D conversion module 13 sends the conversion to the single-chip microcomputer control processing module 14 after conversion.

The first constant current measuring zero resistance/stroke module 114 outputs a 5mA constant current and flows through the first potentiometer Ra to be tested, and the generated voltage is amplified and then converted by the A/D conversion module 13 and then sent to the single chip microcomputer control processing module 14.

The first open circuit detection module 115 is used to detect whether the potentiometer to be detected is connected to the dual potentiometer comprehensive electric parameter detector of this embodiment. The detection signal of the first open circuit detection module 115 is directly output to the single chip microcomputer control processing module 14 .

Still referring to Fig. 2, the second detection module 12 of the first detection unit 1 is mainly composed of a second range selection module 121, a second detection mode selection switch 122, a second constant voltage measuring total resistance module 123, a second constant current measuring zero resistance The /travel module 124 and the second open circuit detection module 125 are composed.

The function of each module of the second detection module 12 is identical with the corresponding module function of the first detection module 11; The electrical connection mode of 14 is correspondingly the same as that of the first detection module 11 . The second detection module 12 is electrically connected to the second potentiometer Rb when in use.

The A/D conversion module 13 of the first detection unit 1 is used for performing analog/digital conversion on the signals transmitted by the first detection module 11 and the second detection module 12 and then transmitting them to the single-chip microcomputer control processing module 14 . The core device of the A/D conversion module 13 is an integrated A/D converter chip of AD574 type.

The core device of the single-chip microcomputer control processing module 14 of the first detection unit 1 is a single-chip microcomputer. In this embodiment, the single-chip microcomputer of the single-chip microcomputer control processing module 14 preferably adopts a single-chip microcomputer whose model is STC90C54RD.

The single-chip microcomputer control processing module 14 receives the data transmitted by the A/D conversion module 13 and calculates the total resistance and zero resistance of the first potentiometer Ra and the second potentiometer Rb of the detected double potentiometer Wx, as well as the first potentiometer Ra and the second potentiometer Rb. Synchronous characteristics of two potentiometers Rb:

Single-chip microcomputer control processing module 14 according to formula:

Calculate the total resistance of the first potentiometer Ra and the second potentiometer Rb. In the formula, the V _{sampling voltage} is the voltage signal output by the first constant voltage measuring total resistance module 113 or the second constant voltage measuring total resistance module 123 and converted by the A/D conversion module 13 and then sent to the single chip microcomputer control processing module 14 The R _{sampling resistor} is the resistance value of one of the three sampling resistors of the first range selection module 111 or the second range selection module 121 .

Single-chip microcomputer control processing module 14 according to formula:

$R=\frac{V}{5\mathrm{mA}}$ (Formula 2)

Calculate the zero resistance of the first potentiometer Ra and the second potentiometer Rb. In the formula, V is the voltage output by the first constant current measuring zero resistance/stroke module 114 or the second constant current measuring zero resistance/stroke module 124, which is amplified and converted by the A/D conversion module 13 and then sent to the single chip microcomputer control processing module 14. Signal.

When measuring the synchronization characteristics of the first potentiometer Ra and the second potentiometer Rb, the single-chip microcomputer control processing module 14 first according to the formula:

Calculate the voltage attenuation on the first potentiometer Ra, which is stroke A; the voltage attenuation B on the second potentiometer Rb is stroke B, where V is measured by the first constant current zero resistance/stroke module 114 or the second The constant current measuring zero resistance/stroke module 124 outputs the voltage signal sent to the single-chip microcomputer control processing module 14 after being amplified and converted by the A/D conversion module 13, and VCC is a +10V constant voltage;

Then, the single-chip microcomputer control processing module 14 calculates the synchronization difference of the first potentiometer Ra and the second potentiometer Rb according to the following formula:

Synchronization difference (dB) = stroke B - stroke A (Formula 4)

The single-chip microcomputer control processing module 14 will calculate the total resistance, zero resistance and synchronization difference (dB) of the first potentiometer Ra and the second potentiometer Rb, and the first open circuit detection module 115 and the second open circuit detection module 125 received by it. The output detection signal is sent to the information comprehensive processing unit 3 in real time. The single-chip control processing module 14 implements control to the first range selection module 111 and the second range selection module 121 to select the range according to the instruction of the information comprehensive processing unit 3, and implements the first detection mode selection switch 112 and the first detection mode selection switch 112. Control to select total resistance or zero resistance/travel.

The information comprehensive processing unit 3 receives the information of the total resistance, zero resistance and synchronization difference (dB) of the first potentiometer Ra and the second potentiometer Rb transmitted by the single-chip microcomputer control processing module 14 in real time, and sends it to the touch screen after processing 4 for real-time display. When the first open-circuit detection module 115 and the second open-circuit detection module 125 of the first detection unit 1 detect that there is no potentiometer to be detected is inserted, after the information integrated processing unit 3 receives the signal transmitted by the single-chip control processing module 14 , to control the dual potentiometer electrical parameter comprehensive detector of this embodiment to be in the standby state.

1 and 3, the second detection unit 2 is used to detect the dynamic noise characteristics of the first potentiometer Ra and the second potentiometer Rb of the dual potentiometer Wx.

The second detection unit 2 is mainly composed of a first preamplifier filter circuit 21, a first mid-amplifier circuit 22, a first peak detection circuit 23, a second preamplifier filter circuit 24, a second mid-amplifier circuit 25, and a second preamplifier circuit 25. The peak detection circuit 26, the single-chip microcomputer processing circuit 27 and the noise sampling and power amplifier circuit 28 are composed.

The first preamplifier filter circuit 21, the first middle amplifier circuit 22, the first peak detection circuit 23, the second preamplifier filter circuit 23, the second middle amplifier circuit 25 and the second peak detector circuit 26 are all set respectively Signal input terminal, signal output terminal, first power supply terminal and second power supply terminal are arranged; SCM processing circuit 27 is provided with first signal input terminal, second signal input terminal, communication terminal and power supply terminal; noise sampling and power amplifier circuit 28 are set There are a first signal input terminal, a second signal input terminal, a signal output terminal, a first power supply terminal and a second power supply terminal.

The signal input end of the first preamplification filter circuit 21 is the first input interface end of the aforementioned second detection unit 2, and is electrically connected with the sliding end of the first potentiometer Ra of the dual potentiometer Wx during use; the first The signal input end of the middle amplifier circuit 22 is electrically connected with the signal output end of the first preamplification filter circuit 21; the signal input end of the first peak detection circuit 23 is electrically connected with the signal output end of the first middle amplifier circuit 22;

The signal input end of the second preamplification filter circuit 24 is the second input interface end of the aforementioned second detection unit 2, and is electrically connected with the sliding end of the second potentiometer Rb of the dual potentiometer Wx during use; the second The signal input end of the middle amplifier circuit 25 is electrically connected with the signal output end of the second preamplifier filter circuit 24; the signal input end of the second peak detection circuit 26 is electrically connected with the signal output end of the second middle amplifier circuit 25;

The first signal input end of the single-chip processing circuit 27 is electrically connected with the signal output end of the first peak detection circuit 23; the second signal input end of the single-chip processing circuit 27 is electrically connected with the signal output end of the second peak detection circuit 26; The communication terminal of circuit 27 is the signal input and output terminal of the aforementioned second detection unit 2; the first signal input terminal of noise sampling and power amplifier circuit 28 is electrically connected with the signal output terminal of the first intermediate amplifier circuit 22; noise sampling and The second signal input end of the power amplifier circuit 28 is electrically connected to the signal output end of the second intermediate amplifier circuit 25 ; the signal output end of the noise sampling and power amplifier circuit 28 is the speaker signal output end of the aforementioned second detection unit 2 .

The power supply end of the single-chip processing circuit 27 is the first power supply end (connected to +5V) of the aforementioned second detection unit 2; , the second preamplifier filter circuit 24, the second middle amplifier circuit 25, the second peak detection circuit 26 and the noise sampling and the first power supply end of the power amplifier circuit 28 jointly constitute the second power supply end of the aforementioned second detection unit 2 (connected to +12V); the first preamplifier filter circuit 21, the first mid-amplifier circuit 22, the first peak detection circuit 23, the second preamplifier filter circuit 24, the second mid-amplifier circuit 25, and the second peak value The second power supply terminal of the detection circuit 26 and the noise sampling and power amplifier circuit 28 jointly constitute the third power supply terminal (connected to -12V) of the aforementioned second detection unit 2 .

The core device of the single-chip processing circuit 27 is a single-chip microcomputer. In this embodiment, the single-chip microcomputer of the single-chip processing circuit 27 preferably adopts a single-chip microcomputer whose model is STC12C5410AD. The single-chip processing circuit 27 processes the received 2-way signals and uploads the corresponding data to the integrated information processing unit 3, and accepts the control of the integrated information processing unit 3.

Still see Fig. 1, the core device of integrated information processing unit 3 is single-chip microcomputer, in the present embodiment, the single-chip microcomputer of information integrated processing unit 3 preferably adopts the high-speed micro-controller that model is STC12C5A60S2, and the instruction code of this type single-chip microcomputer is fully compatible with traditional 8051 , but the speed is 8-12 times faster, with 60K user application space, 1280 bytes of RAM integrated on the chip, with EEPROM function, which can conveniently realize the power-off storage of the set allowable value. This type of single-chip microcomputer has two full-duplex serial communication interfaces adopting UART working mode for real-time two-way communication with the single-chip microcomputer control processing module 14 of the first detection unit 1 and the single-chip microcomputer processing circuit 29 of the second detection unit 2.

Referring to Fig. 4 to Fig. 6, the touch screen 4 is used for parameter setting and information display. The user sets the test parameter allowable value by touching the display screen and saves it in the single-chip microcomputer of the information comprehensive processing unit 3, and the information comprehensive processing unit 3 sends corresponding information to the single-chip microcomputer control processing module 14 of the first detection unit 1 and the second detection unit 2. The single-chip processing circuit 29 and the touch display screen 4 simultaneously display the data transmitted by the information comprehensive processing unit 3 in the form of characters and curves in real time.

Indicator lamp 5 is used for light alarm. Indicator light 5 is provided with 2, and one of them is green light, and another is red light. Whether the indicator light 5 is lit or not is controlled by the information comprehensive processing unit 3: when the measured data of the double potentiometer Wx received by the information comprehensive processing unit 3 is compared with the preset value, the green light is turned on for qualified products; Unqualified products will light up the red light and flash the alarm. In this embodiment, the indicator light 5 is preferably an LED light.

The buzzer 6 is controlled by the integrated information processing unit 3, and is used for sound prompts during parameter setting, and different sounds for alarming unqualified products during detection.

The horn 9 is used to display the dynamic noise through the sound. During the detection process, skilled and experienced testers can roughly judge whether the dynamic noise of the tested dual potentiometer Wx is within the preset range through the sound from the horn 9 .

The working process of the double-connected potentiometer electrical parameter comprehensive detector (hereinafter referred to as the detector) in this embodiment is briefly described as follows:

The tester is connected to 220V mains, touch the display screen 4 to enter the setting interface as shown in Figure 4, and each parameter value displayed at this time is the preset parameter value stored in the tester's memory. The user pre-sets according to the relevant parameters of the tested dual potentiometer Wx:

The user sets the parameters by touching the button below the screen of the display screen 4 and adopting the method of modifying the current data. The specific method is: first touch the "Setting" button, a cursor will appear under the data item number of the total resistance at the top of the screen, touch the "Setting" button again, the cursor will move down one line, and when it moves to the bottom line, it will cycle back to The uppermost row; if you touch the "Shift" button, the cursor will move to the right, and when it moves to the rightmost end, it will move to the leftmost end circularly; move the cursor up and down, left and right, let the cursor point to the number to be modified, and then touch " Add 1” button to modify the value indicated by the cursor. After modifying all the parameters in this way, touch the "Confirm" button at last, and hear the buzzer 6 beep, indicating that the modified preset parameter values have been stored in the memory, and the instrument enters the test state, touch the display 4 The test interface displayed on the screen is shown in Figure 5, and the user can continue to perform test operations at this time.

When the double potentiometer Wx is electrically connected to the tester (in actual use, a special fixture electrically connected to the tester is usually used to insert the double potentiometer Wx), the tester will first test and display on the screen of the touch screen 4 Immediately display the respective total resistance values of the first potentiometer Ra and the second potentiometer Rb of the dual potentiometer Wx. Buzzer 6 sends out a "beep" sound to show that the total resistance is qualified; if the total resistance of one or two connections exceeds the preset range, the liquid crystal will display the total resistance in reverse white, and the buzzer will not sound. If no sound is heard, it can be known that the total resistance of the dual potentiometer is unqualified.

Then test the zero resistance of the dual potentiometer Wx. When the dual potentiometer Wx is rotated counterclockwise to the end, the instrument will test the zero resistance, and the first potentiometer Ra and the second potentiometer Rb of the dual potentiometer Wx will appear at the corresponding position of the "front zero resistance" data item on the screen. Two-connection zero-resistance measured data, if the two-connection zero-resistance is within the preset value range, the buzzer will hear a "beep" sound to show that the zero-resistance is qualified; such as the double-connection potentiometer Wx If one of the first potentiometer Ra and the second potentiometer Rb fails, there will be no sound.

Next, the synchronous characteristics and dynamic noise tests of the first potentiometer Ra and the second potentiometer Rb of the dual potentiometer Wx are performed. The user only needs to turn the dual potentiometer Wx clockwise to the end. In the process of rotation, on the one hand: the current measured synchronization difference and the corresponding B-link stroke appear at the corresponding positions of the "synchronization" and "travel" data items above the screen of the touch display 4, and the potentiometer is clockwise at the bottom of the screen. The "synchronous characteristic curve" is drawn from right to left during the rotation process. The abscissa of the curve is the B-link travel, the unit is "dB"; the ordinate is the synchronization difference (the difference between the B-link and A-link travel), the unit is "dB" . There are two dotted lines above and below the abscissa, indicating the allowable allowable range of the synchronous difference between A and B (with the allowable preset value of the synchronous difference), if the drawn curve is between the two dotted lines, it means that the synchronization is qualified; if it exceeds The range defined by the dotted line indicates that the stroke position is out of sync. The curve intuitively reflects the degree of synchronous out-of-tolerance and the position of out-of-tolerance. On the other hand: the current measured maximum value of the linkage noise of A and B appears at the corresponding position of the data item "Dynamic Noise" at the top of the screen; the user can also hear the "Dynamic Noise" emitted from the speaker 9 during the rotation of the dual potentiometer Wx ", the size of the sound can intuitively reflect the size of the dynamic noise of the dual potentiometer Wx.

When the double potentiometer Wx is rotated clockwise to the end, the detection process of a double potentiometer is all over, and the detector will make a qualified judgment on all the measured parameters: when the total resistance, zero resistance, dynamic Noise and synchronization performance are consistent with the allowable value of the preset parameters, then the buzzer 6 will send out three prompts of "beep...beep...beep", and at the same time, the green light of the indicator light 5 will flash to show that it is qualified; if one or more If the parameters are unqualified (unqualified data items are displayed in reverse video on the screen of the touch display 4), the buzzer 6 will not sound, and the red light of the indicator light 5 will be on and flickering at the same time. Distinguish whether the product is qualified or not. The result data after the test of a certain type of double potentiometer is shown in Figure 6.

Finally, pull out the double potentiometer, the screen data will be cleared, and the detection of the next double potentiometer can be continued.

In summary, the dual potentiometer electrical parameter comprehensive detector of this embodiment can integrate the detection of the total resistance, zero resistance, synchronous characteristics and dynamic noise characteristics of the dual potentiometer, thereby effectively reducing the number of inspections on the production line of the enterprise. Equipment and labor can greatly save the cost of the enterprise and improve the production efficiency of the enterprise; by setting the touch screen, it is convenient to pre-set the parameters before the inspection, and can intuitively display the relevant technical parameters and curves during the inspection process. It is fast and convenient to judge whether the relevant indicators are qualified by the data and graphics intuitively; by setting the buzzer and the indicator light, it can clearly prompt the inspector whether the index of the double-connected potentiometer to be tested is qualified, and improve work efficiency; When using a potentiometer, skilled inspectors can judge whether the dynamic noise index of the double potentiometer is qualified by the sound from the horn, which can greatly improve work efficiency; through the combination of analog circuits and single-chip computers, compared with full analog Circuit detection equipment, detection accuracy has been significantly improved.

The above embodiments are descriptions of specific implementations of the present invention, rather than limitations of the present invention. Those skilled in the relevant technical fields can also make various transformations and changes without departing from the spirit and scope of the present invention. Corresponding equivalent technical solutions, therefore all equivalent technical solutions should fall into the patent protection scope of the present invention.

Claims (8)

1. A dual potentiometer comprehensive detector for electrical parameters, characterized in that it includes a first detection unit (1), a second detection unit (2), an information comprehensive processing unit (3), a touch display screen (4), Indicator light (5), buzzer (6), power supply module (7), constant voltage source module (8) and horn (9); The first detection unit (1) is provided with first to fourth input interface terminals, signal input and output terminals, first to fourth power supply terminals and first to third constant voltage input terminals; the second detection unit (2 ) is provided with a first input interface terminal, a second input interface terminal, a signal input and output terminal, a horn signal output terminal, and first to third power supply terminals; the integrated information processing unit (3) is provided with a first detection signal communication terminal, a second 2. Detection signal communication terminal, human-computer interaction signal communication terminal, indicator light control terminal, buzzer control terminal and power supply terminal; the touch display screen (4) has a signal communication terminal and a power supply terminal; the indicator light (5) has a control terminal A signal input terminal and a power supply terminal; the buzzer (6) is provided with a control signal input terminal and a power supply terminal; the power supply module (7) is provided with a power supply input terminal and the first to fourth power supply output terminals; the constant voltage source module (8) It is provided with a power supply input terminal and the first to third constant voltage output terminals; the speaker (9) is provided with a signal input terminal; The first detection signal communication terminal of the information comprehensive processing unit (3) is electrically connected with the signal input and output terminals of the first detection unit (1) in a bidirectional signal; the second detection signal communication terminal of the information comprehensive processing unit (3) is connected to the second detection signal The signal input and output ends of the unit (2) are electrically connected with two-way signals; the signal communication end of the touch display screen (4) is electrically connected with the human-computer interaction signal communication end of the integrated information processing unit (3); The control signal input terminal is electrically connected to the indicator light control terminal signal of the information comprehensive processing unit (3); the control signal input terminal of the buzzer (6) is electrically connected to the buzzer control terminal signal of the information comprehensive processing unit (3); The signal input end of the horn (9) is electrically connected to the horn signal output end of the second detection unit (2); The first to fourth power supply terminals of the first detection unit (1) are respectively electrically connected to the first to fourth power supply output terminals of the power supply module (7); the first to third constant voltage terminals of the first detection unit (1) The input terminals are respectively electrically connected to the first to third constant voltage output terminals of the constant voltage source module (8); the first to third power supply terminals of the second detection unit (2) are respectively corresponding to the first to third power supply terminals of the power supply module (7). One to the third power supply output terminal are electrically connected; the power supply terminal of the integrated information processing unit (3), the power supply terminal of the touch display screen (4), the power supply terminal of the indicator light (5) and the power supply terminal of the buzzer (6) are all It is electrically connected to the first power output end of the power supply module (7); the power input end of the constant voltage power supply module (8) is electrically connected to the fourth power output end of the power supply module (7); When in use, the power input terminal of the power supply module (7) is connected to the AC 220V mains; the first and second input interface terminals of the first detection unit (1) respectively correspond to the first two-connection potentiometer Wx to be detected. A fixed terminal of the potentiometer Ra is electrically connected to the sliding terminal; the third and fourth input interface terminals of the first detection unit (1) respectively correspond to a fixed terminal of the second potentiometer Rb of the double potentiometer Wx and The sliding end is electrically connected; the first input interface end of the second detection unit (2) is electrically connected to the sliding end of the first potentiometer Ra; the second input interface end of the second detection unit (2) is connected to the second potentiometer Rb The sliding end of the first potentiometer Ra is electrically connected; the other fixed terminal of the first potentiometer Ra and the other fixed terminal of the second potentiometer Rb are grounded. 2. The dual potentiometer electric parameter comprehensive detector according to claim 1, characterized in that: the first power output terminal of the power module (7) outputs +5V power; the second power supply module (7) The power supply output terminal outputs +12V power supply; the third power supply output terminal of the power supply module (7) outputs -12V power supply; the fourth power supply output terminal of the power supply module (7) outputs +18V power supply; The first constant voltage output terminal of the constant voltage source module (8) outputs a +10V constant voltage; the second constant voltage output terminal of the constant voltage source module 8 outputs a +5V constant voltage; the third constant voltage output terminal of the constant voltage source module 8 Output +0.1V constant voltage. 3. The dual potentiometer electrical parameter comprehensive detector according to claim 1, characterized in that: the first detection unit (1) includes a first detection module (11), a second detection module (12), A/D conversion module (13) and single-chip microcomputer control processing module (14); The first detection module (11) and the second detection module (12) are respectively equipped with a voltage measurement control signal input terminal, a current measurement control signal input terminal, a first to a third range control signal input terminal, a total resistance signal Output terminal, zero resistance/stroke signal output terminal, open circuit signal output terminal, first to fourth power supply terminals and first to third constant voltage input terminals; the A/D conversion module (13) is provided with a first total resistance signal input end, the first zero resistance/stroke signal input end, the second total resistance signal input end, the second zero resistance/stroke signal input end, the signal communication end, the first to the third power supply end; the single-chip control processing module (14) is set There are voltage measurement control signal output terminals, current measurement control signal output terminals, the first to third range control signal output terminals, the first open circuit signal input terminal, the second open circuit signal input terminal, internal communication terminal, external communication terminal and power supply end; Both the voltage measurement control signal input terminal of the first detection module (11) and the voltage measurement control signal input terminal of the second detection module (12) are electrically connected to the voltage measurement control signal output terminal of the single-chip microcomputer control processing module (14); the first The current measurement control signal input terminal of the detection module (11) and the current measurement control signal input terminal of the second detection module (12) are electrically connected to the current measurement control signal output terminal signal of the single-chip control processing module (14); the first detection module (11) The first to third range control signal input terminals and the first to third range control signal input terminals of the second detection module (12) respectively correspond to the first to third ranges of the single-chip microcomputer control processing module (14) Signal electrical connection of the control signal output terminal; The first total resistance signal input terminal and the second total resistance signal input terminal of the A/D conversion module (13) respectively correspond to the total resistance signal output terminal of the first detection module (11) and the total resistance of the second measurement module (12). The resistance signal output terminal is electrically connected to the signal; the first zero resistance/stroke signal input terminal and the second zero resistance/stroke signal input terminal of the A/D conversion module (13) correspond to the zero resistance/stroke signal input terminal of the first detection module (11) respectively. The travel signal output terminal is electrically connected to the zero-resistance/travel signal output terminal of the second detection module (12); The first open-circuit signal input terminal and the second open-circuit signal input terminal of the single-chip microcomputer control processing module (14) respectively correspond to the open-circuit signal output terminal of the first detection module (11) and the open-circuit signal output terminal signal of the second detection module (12). Electrically connected; the internal communication end of the single-chip microcomputer control processing module (14) is electrically connected with the signal communication end of the A/D conversion module (13); the external communication end of the single-chip microcomputer control processing module (14) is the first described A signal input and output terminal of the detection unit (1); The first power supply terminal of the first detection module (11), the first power supply terminal of the second detection module (12), the first power supply terminal of the A/D conversion module (13) and the power supply terminal of the single-chip microcomputer control processing module (14) Together constitute the first power supply terminal of the first detection unit (1); the second power supply terminal of the first detection module (11), the second power supply terminal of the second detection module (12) and the A/D conversion module (13) The second power supply terminal jointly constitutes the second power supply terminal of the first detection unit (1); the third power supply terminal of the first detection module (11), the third power supply terminal of the second detection module (12) and the A/D conversion module The third power terminal of (13) jointly constitutes the third power terminal of the first detection unit (1); the fourth power terminal of the first detection module (11) and the fourth power terminal of the second detection module (12) jointly constitute The fourth power supply terminal of the first detection unit (1); the first to third constant voltage input terminals of the first detection module (11) and the second detection module (12) together constitute the first detection unit (1) To the third constant voltage input terminal. 4. The dual potentiometer comprehensive electric parameter detector according to claim 3, characterized in that: the first detection module (11) includes a first range selection module (111), a first detection mode selection switch ( 112), the first constant voltage measuring total resistance module (113), the first constant current measuring zero resistance/stroke module (114) and the first open circuit detection module (115); The first range selection module (111) is provided with first to third range control signal input terminals, a first voltage signal output terminal, a second voltage signal output terminal, a first power supply terminal, a second power supply terminal, a constant voltage input terminal and Constant voltage output terminal; the first detection mode selection switch (112) has a total of 14 connection pins from 1 to 14; the first constant voltage measuring total resistance module (113) is provided with a first voltage signal input terminal and a second voltage signal input Terminal, detection signal output terminal, first power supply terminal and second power supply terminal; the first constant current measuring zero resistance/stroke module (114) is provided with constant voltage input terminal, current output terminal, voltage signal input terminal and detection signal output terminal ; The first open circuit detection module (115) is provided with a constant voltage input terminal, a signal input terminal and a signal output terminal; The first voltage signal input end of the first constant voltage measuring total resistance module (113) is electrically connected to the first voltage signal output end of the first range selection module (111); the first constant voltage measuring total resistance module (113) second The two voltage signal input terminals, the second voltage signal output terminal of the first range selection module (111) and the No. 2 connection pin of the first detection mode selection switch (112) are in line; the first detection mode selection switch (112) 1 Pin 11, pin 11, and a fixed terminal of the first potentiometer Ra are in line; pin 10 of the first detection mode selection switch (112) is connected to the constant voltage output terminal of the first range selection module (111) Electrical connection; No. 3 and No. 9 connecting pins of the first detection mode selection switch (112) and the current output terminal of the first constant current measurement zero resistance/stroke module (114) are collinear; the first detection mode selection switch ( 112), the No. 4 terminal pin, the No. 8 terminal pin, the voltage signal input terminal of the first constant current measuring zero resistance/stroke module (114) and the sliding terminal of the first potentiometer Ra are collinear; the first open circuit detection module ( The signal input end of 115) is electrically connected to the detection signal output end of the first constant voltage measuring total resistance module (113); The No. 12 and No. 13 terminals of the first detection mode selection switch (112) jointly constitute the voltage measurement control signal input terminal of the first detection module (11); the 5th connection pin of the first detection mode selection switch (112) Terminal pin No. 6 and terminal pin No. 6 together constitute the current measurement control signal input terminal of the first detection module (11); the first to third range control signal input terminals of the first range selection module (111) are the first detection module The first to third range control signal input terminals of (11); the first power supply terminal of the first range selection module (111) is the first power supply terminal of the first detection module (11); the first constant voltage measuring total resistance The first power supply terminal of the module (113) is the second power supply terminal of the first detection module (11); the second power supply terminal of the first constant voltage measuring total resistance module (113) is the first detection module (11) The third power supply terminal; the second power supply terminal of the first range selection module (111) is the fourth power supply terminal of the first detection module (11); the constant voltage input terminal of the first range selection module (111) is the first The first constant voltage input terminal of the detection module (11); the constant voltage input terminal of the first constant current measuring zero resistance/stroke module (114) is the second constant voltage input terminal of the first detection module (11); the first The constant voltage input terminal of the open circuit detection module (115) is the third constant voltage input terminal of the first detection module (11); the detection signal output terminal of the first constant voltage total resistance measurement module (113) is the first detection module (11) total resistance signal output end; the detection signal output end of the first constant current measuring zero resistance/stroke module (114) is the zero resistance/stroke signal output end of the first detection module (11); the first open circuit detection The signal output end of the module (115) is the open circuit signal output end of the first detection module (11). 5. The dual potentiometer electrical parameter comprehensive detector according to claim 4, characterized in that: the first range selection module (111) of the first detection module (11) includes 3 relay switches and 3 Precision reference resistors with different resistance values; the first detection mode selection switch (112) is a four-way analog switch of the CD4066 type; the core device of the single-chip microcomputer control processing module (14) is a single-chip microcomputer of the STC90C54RD type. 6. The dual potentiometer electrical parameter comprehensive detector according to claim 1, characterized in that: the second detection unit (2) includes a first preamplifier filter circuit (21), a first mid-amplifier Circuit (22), first peak detection circuit (23), second preamplifier filter circuit (24), second middle amplifier circuit (25), second peak detection circuit (26), single-chip processing circuit (27) and noise sampling and power amplifier circuit (28); The first preamplifier filter circuit (21), the first mid-amplifier circuit (22), the first peak detection circuit (23), the second preamplifier filter circuit (24), and the second mid-amplifier circuit (25) and the second peak detection circuit (26) are respectively provided with a signal input terminal, a signal output terminal, a first power supply terminal and a second power supply terminal; the single-chip processing circuit (27) is provided with a first signal input terminal, a second Signal input terminal, communication terminal and power supply terminal; the noise sampling and power amplifier circuit (28) is provided with a first signal input terminal, a second signal input terminal, a signal output terminal, a first power supply terminal and a second power supply terminal; The signal input end of the first pre-amplification filter circuit (21) is the first input interface end of the second detection unit (2); The signal output end of the amplifier filter circuit (21) is electrically connected; the signal input end of the first peak detection circuit (23) is electrically connected with the signal output end of the first middle amplifier circuit (22); The signal input end of the second pre-amplification filter circuit (24) is the second input interface end of the second detection unit (2); The signal output end of the amplifier filter circuit (24) is electrically connected; the signal input end of the second peak detection circuit (26) is electrically connected with the signal output end of the second intermediate amplifier circuit (25); The first signal input end of the single-chip processing circuit (27) is electrically connected to the signal output end of the first peak detection circuit (23); the second signal input end of the single-chip processing circuit (27) is connected to the second peak detection circuit (26) The signal output end is electrically connected; the communication end of the single-chip processing circuit (27) is the signal input and output end of the second detection unit (2); the first signal input end of the noise sampling and power amplifier circuit (28) is connected to the first The signal output end of the middle amplifier circuit (22) is electrically connected; the second signal input end of the noise sampling and power amplifier circuit (28) is electrically connected with the signal output end of the second middle amplifier circuit (25); the noise sampling and power amplifier circuit The signal output terminal of (28) is the horn signal output terminal of the second detection unit (2); The power supply terminal of the single-chip processing circuit (27) is the first power supply terminal of the second detection unit (2); the first preamplifier filter circuit (21), the first mid-amplifier circuit (22), the first The peak detection circuit (23), the second preamplifier filter circuit (24), the second mid-amplification circuit (25), the second peak detection circuit (26) and the first power supply terminal of the noise sampling and power amplifier circuit (28) Together constitute the second power terminal of the second detection unit (2); the first pre-amplification filter circuit (21), the first mid-amplification circuit (22), the first peak detection circuit (23), the second The second power terminal of the pre-amplification filter circuit (24), the second middle amplifier circuit (25), the second peak detection circuit (26) and the noise sampling and power amplifier circuit (28) together constitute the second detection unit (2) The third power terminal. 7. The comprehensive detector for electrical parameters of dual potentiometers according to claim 6, characterized in that: the core component of the single-chip processing circuit (27) of the second detection unit (2) is a single-chip microcomputer of STC12C5410AD type. 8. The comprehensive detector of electrical parameters of dual potentiometers according to claim 1, characterized in that: the core device of the integrated information processing unit (3) is a single-chip microcomputer of STC12C5A60S2 type.