CN207036908U - A kind of signal generator and handheld digital pulse and electric current tester - Google Patents
A kind of signal generator and handheld digital pulse and electric current tester Download PDFInfo
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- CN207036908U CN207036908U CN201720654861.0U CN201720654861U CN207036908U CN 207036908 U CN207036908 U CN 207036908U CN 201720654861 U CN201720654861 U CN 201720654861U CN 207036908 U CN207036908 U CN 207036908U
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Abstract
The utility model provides a kind of signal generator, includes multiplication DAC, two operational amplifiers, two low pass filters, impedance and the VI converters of master controller, two voltage output patterns；Wherein, master controller is formed by ARM chips and its peripheral circuit；One operational amplifier is concatenated into voltage pulse signal output branch road with a low pass filter and impedance successively；Another operational amplifier is concatenated into current signal output branch road with another low pass filter and VI converters successively；After the multiplication DAC phases of two voltage output patterns concatenate and with master controller phase and connecing, and one of multiplication DAC of two voltage output patterns also connects the operational amplifier of voltage pulse signal output branch road and current signal output branch road simultaneously.Implement the utility model, voltage pulse output signal and current signal can be used for the verification of instrument simultaneously, and there is higher precision, stability and reliability.
Description
Technical Field
The utility model relates to a signal check-up technical field especially relates to a signal generator and hand-held type digital pulse and current check gauge.
Background
All instruments that generate test signals are commonly referred to as signal generators and are widely used to generate electrical test signals of specific parameters required by a circuit under test. When testing, researching or adjusting electronic circuits and equipment, the signal generator provides electric signals meeting the determined technical conditions for some electric parameters (such as frequency response, noise coefficient, voltmeter accuracy and the like) of a measuring circuit so as to simulate the excitation signals of the equipment to be tested used in actual work, and parameters (such as frequency, waveform, output voltage or power and the like) of output signals can be accurately adjusted within a certain range, so that the electronic circuit and equipment have good stability. For example, when a steady state characteristic measurement of the system is required, the signal generator may simulate a sinusoidal signal source of known amplitude, frequency; as another example, when testing the transient characteristics of the system, the signal generator may simulate a rectangular pulse source with known leading edge time, pulse width, and repetition period.
In the prior art, the signal generator only generates one of the pulse voltage signal and the pulse current signal, and the generated signal strength is weak and cannot be used for the verification of the instrument.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a signal generator and hand-held type digital pulse and current check gauge are provided, can output pulse voltage signal and current signal simultaneously and be used for the check-up of instrument to have higher precision, stability and reliability.
In order to solve the above technical problem, the present invention provides a signal generator, which comprises a main controller, two multiplying DACs in voltage output mode, two operational amplifiers, two low pass filters, an impedance and a VI converter; wherein,
the main controller is formed by an ARM chip and a peripheral circuit thereof;
one of the two operational amplifiers is connected with one of the two low-pass filters and the impedance in series to form a voltage pulse signal output branch circuit;
the other one of the two operational amplifiers is connected with the other one of the two low-pass filters and the VI converter in series to form a current signal output branch circuit;
the multiplying DACs in the two voltage output modes are connected in series and then are connected with the main controller in parallel, and one of the multiplying DACs in the two voltage output modes is also connected with the operational amplifier of the voltage pulse signal output branch circuit and the operational amplifier of the current signal output branch circuit.
Wherein the reference voltage of the multiplying DAC simultaneously connected with the two operational amplifiers is generated by the other multiplying DAC connected with the same, and the reference voltage of the other multiplying DAC is generated by an internal voltage stabilizing current source of the signal generator.
Wherein, the multiplying DAC of the two voltage output modes adopts AD5546 with 16 bits.
The VI converter is provided with four control gears and is connected with the main controller to realize the adjustment of the four control gears.
Wherein, the internal voltage-stabilizing current source of the signal generator provides 5V direct current voltage.
Wherein the impedance is 50 Ω.
The embodiment of the utility model also provides a hand-held digital pulse and current calibrator, which comprises an FPGA, a liquid crystal screen, a key, a data communication module and the signal generator; the FPGA is respectively connected with the signal generator, the liquid crystal display, the keys and the data communication module.
And the data communication module is integrated with a USB interface, an Ethernet interface, an optical fiber interface and a WIFI wireless interface.
Compared with the prior art, the embodiment of the utility model provides a have following beneficial effect:
in the embodiment of the present invention, a voltage pulse signal output branch is formed by connecting an operational amplifier with a low pass filter and an impedance in series in turn, a current signal output branch is formed by connecting another operational amplifier with another low pass filter and a VI converter in series, and a voltage pulse signal and a current signal of the current signal output branch are generated by connecting a multiplying DAC in two voltage output modes in series, so that a weak pulse (uV level) and a weak current signal (10) generated by an analog detector can be generated simultaneously-11Class a) is used for verification of the instrument and has higher accuracy, stability and reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic plan view of a signal generator according to an embodiment of the present invention;
fig. 2 is a schematic view of a planar structure of the handheld digital pulse and current calibrator provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, in order to provide a signal generator according to a first embodiment of the present invention, the signal generator includes a main controller 1, two multiplying DACs 2 in voltage output mode, two operational amplifiers 3, two low pass filters 4, an impedance 5, and a VI converter 6; wherein,
the main controller 1 is formed by an ARM chip and a peripheral circuit thereof;
one of the two operational amplifiers 3 is connected in series with one of the two low-pass filters 4 and the impedance 5 in turn to form a voltage pulse signal output branch, namely, one operational amplifier 3 is connected in series with one of the low-pass filters 4 and the impedance 5 to form a voltage pulse signal output branch;
the other one of the two operational amplifiers 3 is connected in series with the other one of the two low pass filters 4 and the VI converter 6 in turn to form a current signal output branch, i.e. the other one of the operational amplifiers 3 is connected in series with the other one of the low pass filters 4 and the VI converter 6 to form a voltage pulse signal output branch;
the multiplying DACs 2 of the two voltage output modes are connected in series and then connected in parallel with the main controller 1, and one of the multiplying DACs 2 of the two voltage output modes is also connected with the operational amplifier 3 of the voltage pulse signal output branch and the current signal output branch at the same time.
It should be noted that the reference voltage of the multiplying DAC2 corresponding to the simultaneous connection of the two operational amplifiers 3 is generated by the other multiplying DAC2 connected thereto, and the reference voltage of the other multiplying DAC2 is generated by a signal generator internal regulated current source (e.g., a voltage source supplying a 5V dc voltage), so that the voltage accuracy of the serial output of the multiplying DAC2 of the two voltage output mode is doubled.
It should be noted that the VI converter 6 has a plurality of adjustable gears, and the adjustment of the gears is controlled by the main controller 1 through being connected to the main controller 1, for example, the adjustment of the four control gears is implemented by having four control gears, and being connected to the main controller 1.
In one embodiment, the multiplying DACs 2 of both voltage output modes employ a 16-bit AD5546, and the output of the multiplying DAC2 of each voltage output mode is REF _ D/216Thus, the final output of the multiplying DAC2 for the two voltage output modes is REF { D1, D2}/232Where { D1, D2} represents the concatenation of one multiplying DAC output control value D1 and the other multiplying DAC output control value D2 (connecting both the voltage pulse signal output branch and the current signal output branch), for 32 bits.
At this time, the multiplying DAC2 of the two voltage output modes finally generates a programmable voltage V, which follows into the voltage pulse signal output branch and the current signal output branch, respectively:
when the voltage pulse signal enters the voltage pulse signal output branch, the programmable voltage V is followed by the operational amplifier 3 and then is subjected to the low-pass filter 4, and the maximum output frequency is 106Hz. The filtered pulse waveform is output as a final programmable pulse after passing through an impedance of 5 (such as 50 omega);
when entering the current signal output branch, the programmable voltage V is followed by another operational amplifier 3, then another low-pass filter 4 is carried out, and then the programmable voltage V is sent to a VI converter 6, and then the programmable voltage V is converted into a voltage VAnd is changed to I. The VI conversion part has 4 gears which respectively correspond to the resistors (1G omega, 10M omega, 100K omega, 1K omega), V/R is the final current output, and 10 can be generated by controlling the V and the gear resistor R-11A~10-3Programmable current in the a range.
As shown in fig. 2, in order to implement the second embodiment of the present invention, a handheld digital pulse and current calibrator is provided, which includes an FPGAa, a liquid crystal display b, a key c, a data communication module d, and a signal generator e; the FPGAa is respectively connected with the signal generator e, the liquid crystal display b, the key c and the data communication module d; and a USB interface, an Ethernet interface, an optical fiber interface and a WIFI wireless interface are integrated on the data communication module d.
Because the embodiment of the present invention provides a signal generator in the second and the embodiment of the present invention provides a signal generator in the first having the same structure and connection relationship, please refer to fig. 1 specifically and the embodiment of the present invention provides a related content of signal generator in the first, which is not repeated here.
In the second embodiment of the present invention, the FPGAa is used for key acquisition, liquid crystal display control, signal generator output control, network data output, and the like; the liquid crystal screen b adopts a 3.5-inch liquid crystal module, is directly controlled by an SOC chip and visually displays the current pulse amplitude, pulse period, pulse width, current value, change period of pulse and current, temperature and other related parameters; and the key c adopts a mode of 4 function keys and 1 determination key to complete control commands of determining an output numerical value, restarting an output waveform and the like.
Compared with the prior art, the embodiment of the utility model provides a have following beneficial effect:
in the embodiment of the present invention, a voltage pulse signal output branch is formed by connecting an operational amplifier with a low pass filter and an impedance in series, a current signal output branch is formed by connecting another operational amplifier with another low pass filter and a VI converter in series, and a multiplying DAC using two voltage output modes is connected in series to generate different voltages for controlling the voltage pulse signal output branchesThe voltage pulse signal and the current signal of the current signal output branch are changed, so that a weak pulse (uV level) and a weak current signal (10) generated by the analog detector can be generated simultaneously-11Class a) is used for verification of the instrument and has higher accuracy, stability and reliability.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (8)
1. A signal generator is characterized by comprising a main controller, two multiplying DACs in a voltage output mode, two operational amplifiers, two low-pass filters, an impedance converter and a VI converter; wherein,
the main controller is formed by an ARM chip and a peripheral circuit thereof;
one of the two operational amplifiers is connected with one of the two low-pass filters and the impedance in series to form a voltage pulse signal output branch circuit;
the other one of the two operational amplifiers is connected with the other one of the two low-pass filters and the VI converter in series to form a current signal output branch circuit;
the multiplying DACs in the two voltage output modes are connected in series and then are connected with the main controller in parallel, and one of the multiplying DACs in the two voltage output modes is also connected with the operational amplifier of the voltage pulse signal output branch circuit and the operational amplifier of the current signal output branch circuit.
2. The signal generator according to claim 1, wherein the reference voltage of the multiplying DAC connected with two operational amplifiers at the same time is generated by another multiplying DAC connected therewith, and the reference voltage of the other multiplying DAC is generated by a signal generator internal regulated current source.
3. The signal generator of claim 2, wherein the multiplying DACs of the two voltage output modes each employ a 16-bit AD 5546.
4. The signal generator of claim 3, wherein the VI converter has four control gears and is coupled to the main controller to effect adjustment of the four control gears.
5. The signal generator of claim 4, wherein the signal generator internal regulated current source provides 5V DC voltage.
6. Signal generator according to claim 5, characterized in that the impedance is 50 Ω.
7. A hand-held digital pulse and current verifier comprising an FPGA, a liquid crystal display, a key, a data communication module, and a signal generator according to any one of claims 1-6; the FPGA is respectively connected with the signal generator, the liquid crystal display, the keys and the data communication module.
8. The calibrator according to claim 7, wherein the data communication module is integrated with a USB interface, an ethernet interface, a fiber interface, and a WIFI wireless interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720654861.0U CN207036908U (en) | 2017-06-07 | 2017-06-07 | A kind of signal generator and handheld digital pulse and electric current tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720654861.0U CN207036908U (en) | 2017-06-07 | 2017-06-07 | A kind of signal generator and handheld digital pulse and electric current tester |
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| CN207036908U true CN207036908U (en) | 2018-02-23 |
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| CN201720654861.0U Active CN207036908U (en) | 2017-06-07 | 2017-06-07 | A kind of signal generator and handheld digital pulse and electric current tester |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144711A (en) * | 2017-06-07 | 2017-09-08 | 中广核研究院有限公司 | A kind of signal generator and handheld digital pulse and electric current tester |
| CN109307806A (en) * | 2018-09-21 | 2019-02-05 | 北京东方计量测试研究所 | A high-accuracy standard signal source |
-
2017
- 2017-06-07 CN CN201720654861.0U patent/CN207036908U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144711A (en) * | 2017-06-07 | 2017-09-08 | 中广核研究院有限公司 | A kind of signal generator and handheld digital pulse and electric current tester |
| CN109307806A (en) * | 2018-09-21 | 2019-02-05 | 北京东方计量测试研究所 | A high-accuracy standard signal source |
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