CN113899952A - Automatic impedance testing system and method - Google Patents
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses an automatic impedance test system and method, comprising a host, an impedance tester, a compensation correction circuit and a switch matrix; the switch matrix is arranged on the long-line test cable, the long-line test cable is connected with the input end of the impedance tester, the output end of the impedance tester is connected with the host, the impedance tester is used for automatically testing the impedance of the gated channel, and the compensation calibration circuit is used for eliminating the impedance introduced by the long-line test cable and the switch matrix; the output end of the compensation calibration circuit is connected with the input end of the host, and the host is used for correcting the data measured by the impedance test circuit according to the data obtained by the compensation calibration circuit, comparing the corrected data with a preset impedance criterion, and storing the data. The invention solves the problems of poor static impedance testing precision and low testing efficiency of the existing satellite-borne product, saves the testing time, shortens the development period, reduces the cost, improves the testing precision and enhances the safety and the reliability of the product.
Description
Technical Field
The invention belongs to the technical field of electronic testing, and particularly belongs to an automatic impedance testing system and method.
Background
At present, the impedance test of the satellite-borne computer products is mainly carried out in a mode of manual measurement after cable switching, and the measurement result needs to be manually recorded, so that the satellite-borne computer products have the defects of low efficiency and unsafe performance; the signal on the external plug-in is usually designed by double points, and the impedance between the double points is required to be less than 0.1 omega. In the existing testing process, the testing cable is usually long, the self internal resistance of the tested cable is influenced, the precision of the impedance testing result is not high, and sometimes the impedance between two points is larger than 0.1 omega, so that the precision of the impedance influence caused by the introduction of the testing cable can not be ignored on the occasions with higher requirements on the impedance testing precision.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an automatic impedance testing system and method, which are used for solving the problems of poor static impedance testing precision and low testing efficiency of the conventional satellite-borne product.
In order to achieve the purpose, the invention provides the following technical scheme:
an automatic impedance test system comprises a host, an impedance tester, a compensation correction circuit and a switch matrix;
the switch matrix is arranged on the long-line testing cable, the long-line testing cable is connected with the input end of the impedance tester, the output end of the impedance tester is connected with the host, the impedance tester is used for automatically testing the impedance of the gated channel,
the compensation calibration circuit is used for eliminating impedance introduced by the long-line test cable and the switch matrix; the output end of the compensation calibration circuit is connected with the input end of the host, and the host is used for correcting the data measured by the impedance test circuit according to the data obtained by the compensation calibration circuit, comparing the corrected data with a preset impedance criterion, and storing the data.
Preferably, the impedance testing device further comprises a display device, an input end of the display device is connected with an output end of the host, and the display device is used for displaying the corrected impedance testing data and a preset criterion result.
Preferably, the impedance tester adopts a two-line impedance test method, two channels gated by the switch matrix are respectively connected to the red test point and the black test point of the impedance tester, the impedance tester can automatically match a reasonable range and perform testing, and the test result is transmitted to the host computer for data processing.
Preferably, the compensation correction circuit comprises an input unit, a data processing and storing unit, a high-precision AD acquisition unit and a circuit of an RS232 communication serial port;
the input unit is used for inputing the length of long line test cable and the specification model of wire, the input of data processing memory cell is connected to the output of input unit, the input of high accuracy AD acquisition unit is connected to the output of data processing memory cell, the input of the circuit of RS232 communication serial ports is connected to the output of high accuracy AD acquisition unit, the input of host computer is connected to the output of the circuit of RS232 communication serial ports.
Preferably, the impedance tester adopts a 6.5-bit high-precision digital multimeter DM3068, the measuring ranges are respectively six shifts of 200 Ω, 2K Ω, 20K Ω, 1M Ω, 10M Ω and 100M Ω, and the maximum resolution is 0.1M Ω.
Preferably, the switch matrix adopts an independent board card type structure, each independent board card adopts a relay to realize independent gating of 128 channels, and the expansion of the board cards of the switch matrix is carried out according to actual channel requirements.
An automatic impedance test method comprises the following steps,
step 1, connecting a signal to be tested to a switch matrix through a long-line test cable;
step 2, powering up the system, inputting the length of the long-line test cable and the specification model of the conducting wire in the compensation correction circuit, and setting an impedance criterion;
step 3, controlling the switch matrix, accessing the channel to be tested into the system, automatically completing the test by the impedance test circuit and transmitting the test result to the host; the compensation correction circuit also automatically calculates the impedance introduced on the whole test path according to the input parameters and transmits the impedance value to the host;
step 4, the host machine subtracts the data transmitted by the compensation correction circuit from the data transmitted by the impedance tester to obtain calibrated impedance data, compares, analyzes and judges the calibrated data with a preset impedance criterion, and if the calibrated data meets the impedance criterion condition, displays the data correctly on a criterion result list; if the calibrated data does not meet the requirement of the impedance criterion, displaying an error in a criterion result list; and all data is saved.
Preferably, in step 4, the calibrated data, the impedance criterion and the criterion result are displayed through a display device and automatically stored in a file form; and storing error information which does not meet the requirement of the impedance criterion in a separate file.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the automatic impedance testing system provided by the invention, the automation level of the system is improved through the extensible switch matrix and the data interpretation and storage mechanism, the impedance testing precision is improved by using the compensation and correction circuit, the problems of poor testing precision and low testing efficiency of the traditional manual testing method are solved, the development cycle of a product is shortened, the cost is reduced, and the reliability of the product is improved. The invention solves the problems of poor static impedance testing precision and low testing efficiency of the existing satellite-borne product, saves the testing time, shortens the development period and reduces the cost; meanwhile, the risk of manual operation is reduced, the testing precision is improved, and the safety and the reliability of the product are enhanced. The test system and the test method are already applied to the test of the model task, so that the test efficiency of the product is obviously improved; meanwhile, the method is very suitable for occasions with higher impedance test precision requirements (such as impedance between double points is less than 0.1 omega).
Drawings
FIG. 1 is a schematic block diagram of an automated impedance testing system of the present invention;
FIG. 2 is a flow chart of an automated impedance testing method according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides an automatic impedance test system which comprises a host, an impedance tester, a compensation correction circuit, an expandable switch matrix and a display device.
The switch matrix is used for multi-channel selection control, and according to the instruction of an upper computer, the opening or closing operation of the related channel is executed. The switch matrix adopts the form of independent integrated circuit board, and 128 passageways are independently gated to each independent integrated circuit board by adopting the relay, and when in actual application, the switch matrix integrated circuit board can be expanded according to the number of actual passageways, so that the flexibility is higher.
The impedance tester is used for automatically testing the impedance of the gated channel and transmitting the test result to the host. The impedance tester adopts a 6.5-bit high-precision digital multimeter DM3068 developed by Beijing Puyuan smart electrical technology Limited, the measuring range can be divided into six steps of 200 omega, 2K omega, 20K omega, 1M omega, 10M omega and 100M omega, and the maximum resolution is 0.1M omega. When the channel to be tested is connected to the impedance tester through the matrix switch, the impedance tester can automatically select a proper measuring range and transmit the test result to the host through the RS232 serial port. The device has wide range and high resolution, and can be used for impedance test of common satellite-borne electronic products and machine-borne lapping impedance (milliohm level) test of the satellite-borne products.
The compensation correction circuit can automatically calculate impedance errors introduced by the test cable and the internal circuit of the equipment according to the length and the line type of the accessed test cable, and sends the calculation result to the host. The compensation calibration circuit is a circuit which comprises a data processing and storing unit (comprising a processor and a memory), a high-precision AD acquisition unit, a parameter input interface and an RS232 communication serial port and is used for eliminating impedance introduced by a test cable and a switch matrix in a link. Since the known relays are arranged in the switch matrix, the impedance of the part of the line can be obtained by looking up a manual and exists in a fixed value, so that the impedance of the cable connected to the system only needs to be calculated in the actual test process. The tester only needs to input the length of the cable and the specification and the model of the lead through the parameter input interface, and the circuit can automatically calculate the impedance of the cable; the impedance introduced to the whole test path can be calculated through the impedance of the matrix switch and the impedance of the cable, and then the impedance is transmitted to the host through the RS232 serial port.
The host is used for processing and storing the impedance test result. Correcting the data measured by the impedance test circuit by using the data obtained by the compensation correction circuit, comparing the corrected data with a preset impedance criterion, and storing the data;
the display device is used for displaying the corrected impedance test data and a preset criterion result.
An automated impedance testing method comprising the steps of:
step 1, connecting a signal to be tested to a switch matrix of the test system through a test cable;
step 2, powering up the system, and inputting the length of the cable and the specification and model of the lead on a parameter input interface of the compensation correction circuit; setting an impedance criterion of a product to be detected on a display device;
step 3, controlling the switch matrix, accessing the channel to be tested into the system, automatically completing the test by the impedance test circuit and transmitting the test result to the host through the RS232 serial port; the compensation correction circuit also automatically calculates the impedance introduced on the whole test path according to the input parameters, and transmits the impedance value to the host through the RS232 serial port;
and 4, subtracting the data transmitted by the compensation correction circuit from the data transmitted by the impedance tester by the host machine to obtain the real impedance data, thereby realizing the calibration of the impedance test result. Comparing, analyzing and judging the calibrated data with a preset impedance criterion, and if the corrected data meets the impedance criterion condition, displaying the corrected data in a criterion result list correctly; if the impedance criterion requirement is not met, displaying errors in a criterion result list;
step 5, displaying the corrected data, the impedance criterion and the criterion result on an interface together, and automatically storing the data, the impedance criterion and the criterion result in a file form; error information which is not required by the impedance criterion is also stored in a separate file.
According to the automatic impedance testing system and the testing method provided by the invention, the automation level of the system is improved through the switch matrix and the data interpretation and storage mechanism, the impedance testing precision is improved by using the compensation correction circuit, the problems of poor testing precision and low testing efficiency of the traditional manual testing method are solved, the development cycle of a product is shortened, the cost is reduced, and the reliability of the product is improved.
Examples
FIG. 1 is a schematic block diagram of a self-calibrating, expandable automated impedance testing system according to the present invention, which includes a host, an impedance tester, a compensation calibration circuit, an expandable switch matrix, and a display device.
The switch matrix can set the opening or closing of any channel switch through a visual software interface, and can also be controlled by a program. When the impedance between certain two points is tested, the signals of the two points can be transmitted to an impedance tester only by closing the switches of the channels corresponding to the two points;
the impedance tester adopts a two-line impedance test method, two channels gated by the switch matrix are respectively connected to red and black test points of the impedance tester, the impedance tester can automatically match a reasonable range and perform testing, and a test result is transmitted to a host through an RS232 serial port;
the compensation correction circuit is a visual intelligent circuit integrating collection, storage and processing, a tester only needs to input the length of a test cable and the specification and model of a lead into a parameter input interface of the circuit, the circuit can automatically calculate the impedance introduced by the speed measuring cable, the impedance added by the matrix switch is the impedance introduced on the whole test path, and finally the impedance value is transmitted to a host through an RS232 serial port;
the data transmitted by the compensation correction circuit is subtracted from the data transmitted by the impedance tester by the host computer, so that the real impedance value between the two points can be obtained. Then, comparing and judging the impedance value with a preset impedance criterion, and if the impedance value meets the criterion requirement, displaying the impedance value correctly on a criterion result list; if the impedance criterion requirement is not met, displaying errors in a criterion result list, distinguishing the row of test information (comprising test data, test criteria and criterion results) by special characters and special colors (such as red), and storing the error information separately in the form of another file;
the display device mainly displays key information such as test data, test criteria and results, and testers can intuitively master related information.
Fig. 2 is a flow chart of the impedance test of the present invention, in which the length, specification and model of the cable and the impedance criterion are set by visual software, then the software test is started, when the channel to be tested is gated by the switch matrix, the impedance tester will automatically test the impedance of the access channel, and simultaneously the compensation and correction circuit will automatically calculate the impedance introduced by the cable and the switch matrix, and the test data is corrected in the host. Then, whether the test data meet the requirement of an impedance criterion or not is judged by comparison, if the test data meet the requirement of the criterion, the test data are displayed correctly on a criterion result list, and the test data are stored; if the criterion requirement is not met, displaying errors in the criterion result list, storing the test data and storing error information in the form of a single file.
Claims (8)
1. An automatic impedance test system is characterized by comprising a host, an impedance tester, a compensation correction circuit and a switch matrix;
the switch matrix is arranged on the long-line testing cable, the long-line testing cable is connected with the input end of the impedance tester, the output end of the impedance tester is connected with the host, the impedance tester is used for automatically testing the impedance of the gated channel,
the compensation calibration circuit is used for eliminating impedance introduced by the long-line test cable and the switch matrix; the output end of the compensation calibration circuit is connected with the input end of the host, and the host is used for correcting the data measured by the impedance test circuit according to the data obtained by the compensation calibration circuit, comparing the corrected data with a preset impedance criterion, and storing the data.
2. The automated impedance testing system of claim 1, further comprising a display device, wherein an input terminal of the display device is connected to an output terminal of the host, and the display device is configured to display the modified impedance testing data and a result of a predetermined criterion.
3. The automated impedance testing system of claim 1, wherein the impedance tester adopts a two-wire impedance testing method, two channels gated by the switch matrix are respectively connected to the red test point and the black test point of the impedance tester, the impedance tester automatically matches a reasonable range and tests, and the test result is transmitted to the host computer for data processing.
4. The automatic impedance testing system of claim 1, wherein the compensation correction circuit comprises an input unit, a data processing and storing unit, a high-precision AD acquisition unit and an RS232 communication serial port circuit;
the input unit is used for inputing the length of long line test cable and the specification model of wire, the input of data processing memory cell is connected to the output of input unit, the input of high accuracy AD acquisition unit is connected to the output of data processing memory cell, the input of the circuit of RS232 communication serial ports is connected to the output of high accuracy AD acquisition unit, the input of host computer is connected to the output of the circuit of RS232 communication serial ports.
5. The automated impedance testing system of claim 1, wherein the impedance tester uses a 6.5-bit high-precision digital multimeter DM3068 with six ranges of 200 Ω, 2K Ω, 20K Ω, 1M Ω, 10M Ω and 100M Ω, respectively, and a maximum resolution of 0.1M Ω.
6. The automatic impedance testing system of claim 1, wherein the switch matrix is of an independent board card type structure, each independent board card is independently gated for 128 channels by using a relay, and expansion of the board cards of the switch matrix is performed according to actual channel requirements.
7. An automatic impedance test method is characterized by comprising the following steps,
step 1, connecting a signal to be tested to a switch matrix through a long-line test cable;
step 2, powering up the system, inputting the length of the long-line test cable and the specification model of the conducting wire in the compensation correction circuit, and setting an impedance criterion;
step 3, controlling the switch matrix, accessing the channel to be tested into the system, automatically completing the test by the impedance test circuit and transmitting the test result to the host; the compensation correction circuit also automatically calculates the impedance introduced on the whole test path according to the input parameters and transmits the impedance value to the host;
step 4, the host machine subtracts the data transmitted by the compensation correction circuit from the data transmitted by the impedance tester to obtain calibrated impedance data, compares, analyzes and judges the calibrated data with a preset impedance criterion, and if the calibrated data meets the impedance criterion condition, displays the data correctly on a criterion result list; if the calibrated data does not meet the requirement of the impedance criterion, displaying an error in a criterion result list; and all data is saved.
8. The automated impedance testing method according to claim 7, wherein in step 4, the calibrated data, the impedance criterion and the criterion result are displayed by a display device and automatically stored in a file form; and storing error information which does not meet the requirement of the impedance criterion in a separate file.
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| CN116153214A (en) * | 2023-02-27 | 2023-05-23 | 格兰菲智能科技有限公司 | Detection circuit for display panel crack detection, detection method and system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116153214A (en) * | 2023-02-27 | 2023-05-23 | 格兰菲智能科技有限公司 | Detection circuit for display panel crack detection, detection method and system thereof |
| CN116153214B (en) * | 2023-02-27 | 2025-07-15 | 格兰菲智能科技股份有限公司 | Detection circuit for detecting display panel splinter, and detection method and system thereof |
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