CN111693922A - Automatic calibration system of impedance tester - Google Patents
Automatic calibration system of impedance tester Download PDFInfo
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- CN111693922A CN111693922A CN202010773828.6A CN202010773828A CN111693922A CN 111693922 A CN111693922 A CN 111693922A CN 202010773828 A CN202010773828 A CN 202010773828A CN 111693922 A CN111693922 A CN 111693922A
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- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000012795 verification Methods 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims abstract description 6
- 238000013473 artificial intelligence Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The application discloses an automatic calibration system of an impedance tester, which comprises a standard resistor group, a program-controlled line selection device and an upper computer; each group of standard resistors in the standard resistor group respectively corresponds to different standard resistance values; the upper computer is configured to send an instruction to the program control line selection device according to a standard resistance value to be tested; the impedance tester is also configured to receive test data from the impedance tester to be verified for calculation to obtain a verification result; the program control line selection device is configured to automatically select one or more groups of standard resistors to be detected to be connected in the standard resistor group according to an instruction sent by the upper computer; the impedance tester is simple to operate and convenient to use, does not need manual intervention in the calibration process, does not need data processing, and can achieve the purpose of simply, conveniently and intelligently calibrating the impedance tester; the checking result is accurate and clear; the invention is convenient for popularization, and can realize automatic verification of the impedance tester no matter whether the impedance tester has a communication interface or not.
Description
Technical Field
The application relates to the field of automatic calibration systems, in particular to an automatic calibration system of an impedance tester.
Background
Impedance testing is a basic test item in the technical field of power systems, and an impedance tester is a main tool for impedance testing. At present, a plurality of impedance tester manufacturers have long design principles and precision, but the verification result is within the error allowable range, and the impedance tester is qualified. Because the precision of the impedance tester directly determines whether the measured impedance value is accurate, the impedance tester needs to be checked after production is finished; the instrument is also required to be checked at any time in the using process, so that the accuracy of the instrument is ensured to be within the required range.
In the prior art, digital grounding resistance measuring equipment is checked, firstly, a measuring range is selected, a standard resistance is selected, and wiring is completed according to a wiring diagram; then recording data and carrying out related calculation; and finally, listing a table, comparing the precision and obtaining a result. When different measuring ranges are checked, the steps need to be repeated continuously, and the working efficiency is greatly influenced.
Moreover, the work of the existing impedance tester is manually operated, and whether the impedance tester is qualified or not can be manually recorded and calculated by adopting the mode that different standard resistance values corresponding to different ranges can be manually switched. It is significant to establish an automatic calibration system for impedance tester.
Disclosure of Invention
The application provides an automatic calibration system of an impedance tester, which aims to solve the problems that the existing impedance tester needs manual operation, has long working time and low working efficiency and can not be automatically processed.
The application provides an automatic calibration system of an impedance tester, which comprises a standard resistor group, a program-controlled line selection device and an upper computer; one end of the program control line selection device is connected with the standard resistor group, and the other end of the program control line selection device is connected with the upper computer;
the standard resistor group consists of a plurality of groups of standard resistors, wherein each group of standard resistors respectively corresponds to different standard resistance values;
the upper computer is configured to send an instruction to the program control line selection device according to a standard resistance value to be tested; the program control line selection device is also configured to send an instruction to the impedance tester to be verified after being connected with the standard resistor, so that the impedance tester to be verified measures the standard resistor, and simultaneously receives test data from the impedance tester to be verified for calculation and comparison to obtain a verification result;
the program-controlled line selection device is configured to select corresponding standard resistor connections in a standard resistor group according to instructions sent by the upper computer.
Optionally, a communication interface is arranged on the program control line selection device, and the communication interface is used for communicating with the upper computer and the impedance tester to be verified.
Optionally, the upper computer is provided with a memory, and the memory is configured to store the test data from the impedance tester to be verified.
Optionally, the automatic calibration system for the impedance tester is provided with an artificial intelligence image recognition device, and the artificial intelligence image recognition device is configured to read out a test value of the impedance tester through intelligent image recognition and send the test value to the upper computer when the impedance tester to be calibrated cannot communicate with the upper computer.
According to the technical scheme, the automatic calibration system of the impedance tester is provided, and the automatic calibration system of the impedance tester comprises a plurality of groups of standard resistors, a program-controlled line selection device and an upper computer; the program control line selection device selects among a plurality of groups of standard resistors to realize automatic measurement of a plurality of groups of data, outputs test data and uploads the data to an upper computer. If the impedance tester is not provided with a built-in processor and a communication interface, the upper computer can read data on the impedance tester through the artificial intelligence image recognition device. The upper computer can automatically analyze the error between the data uploaded by the impedance tester and the R value of the standard resistor, and record and store the data in the upper computer. And the upper computer analyzes the plurality of groups of errors and then obtains whether the impedance tester is qualified or not. The method has the advantages that the automatic calibration of the impedance tester can be realized by automatically switching, automatically processing and storing the test data in real time according to the preset calibration requirement in the calibration process, so that the impedance tester is automatically calibrated; the checking result is accurate and clear; this application facilitate promotion, no matter whether the impedance tester has communication interface can all realize the automatic check-up of impedance tester.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic diagram of an automatic calibration system of an impedance tester.
The system comprises a standard resistor group 1, a program-controlled line selection device 2, an upper computer 3 and an artificial intelligent image recognition device 4.
Detailed Description
As shown in fig. 1, the present application provides an automatic calibration system for an impedance tester, so as to solve the problems that the existing impedance tester needs manual operation, has long working time and low working efficiency, and cannot perform automatic processing.
The application provides an automatic calibration system of an impedance tester, which comprises a standard resistor group 1, a program-controlled line selection device 2 and an upper computer 3; one end of the program control line selection device 2 is connected with the standard resistor group 1, and the other end of the program control line selection device 2 is connected with the upper computer 3;
the standard resistor group 1 consists of a plurality of groups of standard resistors, wherein each group of standard resistors respectively corresponds to different standard resistance values;
the upper computer 3 is configured to send an instruction to the program-controlled line selection device 2 according to a standard resistance value to be tested; the program control line selection device 2 is also configured to send an instruction to the impedance tester to be verified after being connected with the standard resistor, so that the impedance tester to be verified measures the standard resistor, and meanwhile, test data from the impedance tester to be verified is received for calculation and comparison to obtain a verification result;
the program control line selection device 2 is configured to select corresponding standard resistor connections in the standard resistor group 1 according to instructions sent by the upper computer 3.
Further, a communication interface is arranged on the program control line selection device 2, and the communication interface is used for communicating with the upper computer 3 and the impedance tester to be verified.
Further, the upper computer 3 is provided with a memory configured to store test data from the impedance tester to be verified.
Further, the automatic calibration system of the impedance tester is provided with an artificial intelligence image recognition device 4, and the artificial intelligence image recognition device 4 is configured to read out a test value of the impedance tester through intelligent image recognition and send the test value to the upper computer 3 when the impedance tester to be calibrated cannot communicate with the upper computer 3.
Referring to fig. 1, an impedance tester to be verified is connected to an impedance tester automatic verification system. A user inputs an instruction to the program-controlled line selection device 2 from the upper computer 3, and the program-controlled line selection device 2 selects a set of standard resistance values from a plurality of sets of standard resistance R connecting lines to check through a plurality of program-controlled relays built in the program-controlled line selection device 2 according to the instruction of the upper computer 3; and the impedance tester to be verified receives the instruction of the upper computer 3 to start testing. And the impedance tester outputs test data after the program control line selection device 2 finishes selecting the standard resistor R. If the impedance tester is internally provided with a processor and a communication interface, the impedance tester can directly communicate with the upper computer 3 and upload output data to the upper computer 3. If the impedance tester is not provided with a built-in processor and a communication interface, the upper computer 3 can acquire data on the impedance tester through the artificial intelligence image recognition device 4. And the upper computer performs related data processing on the data acquired from the impedance tester and the standard resistance value selected by the upper computer 3 at the moment through a built-in program, records and stores the data in the upper computer, and outputs the data through the upper computer.
The utility model provides an impedance tester that awaits measuring under the embodiment is by the process of the automatic check-up system check-up of the impedance tester that this application provided, at first will treat the impedance tester access of check-up impedance tester automatic check-up system, treat the one end of check-up impedance tester with host computer 3 is connected, the other end of impedance tester with programme-controlled route selection device 2 is connected, and the impedance tester that treats the check-up is right through programme-controlled route selection device 2 multiunit standard resistance in the standard resistance group measures the back, with measured information send to host computer 3, the following data processing can be accomplished automatically to host computer 3 built-in procedure, including calculation, analysis, contrast to whether qualified result of output impedance tester:
the accuracy grade of the device is assumed to be 2.0 grade, and the maximum allowable error of the device is expressed by an absolute error delta R or a relative error R.
Absolute error Δ R:
ΔR＝±(a％·Rx+b％·Rm) (B.1)
or Δ R ═ ± (±) (% a · R)x+ n words (B.2)
Relative error r:
in the formula: rx-reading of the ground resistance meter;
Rm-full scale value of the earth resistance measuring device;
a-error coefficient associated with the reading;
b-error coefficients associated with full scale;
n-an absolute error term expressed in numbers,
assuming that the 2 conditions that the accuracy grade of the device is known to be 2.0, and "a/b is 4" and "a + b is a numerical value corresponding to the accuracy grade" are available, then a is 1.6%, b is 0.4%, these data are set and calculated by the upper computer 3, and assuming that 3 sets of standard resistors Rn and the device measurement display values Rx, the upper computer 3 can calculate Δ R, r, absolute errors and relative errors of the device at different measuring ranges, and these data are recorded and stored in the upper computer as shown in table a.1.
TABLE A.1 basic error test results of certain digital ground resistance measuring equipment
Taking the range of 0-2 Ω as an example, the upper computer 3 inputs an instruction, and when the program control line selection device 2 selects the standard resistor Rn with the value of 0.500 Ω, Rx ═ Rn ═ 0.500 Ω is taken. The maximum allowable absolute error of the upper computer 3 can be +/-0.016 omega according to the formula (B.1), and the maximum allowable relative error of the upper computer can be +/-3.2% according to the formula (B.2); at the moment, the data of the display value of the impedance tester of 0.515 omega is uploaded to the upper computer through a data interface on the impedance tester or an artificial intelligent image recognition device of the upper computer, and the upper computer analyzes to obtain that the absolute error of the data is 0.015 omega and the relative error is 3.0 percent, so that the equipment error at the point of 0.500 omega meets the requirement of the precision grade. The upper computer 3 outputs a qualified result P of the impedance tester with the measuring range.
Taking the range of 2 Ω to 20 Ω as an example, when the upper computer 3 inputs a command, the program control line selection device 2 selects the standard resistance Rn value of 10.00 Ω, the maximum allowable absolute error of Rx ═ Rn ═ 10.00 Ω is obtained, the upper computer internal control program is according to the formula (b.1), and the maximum allowable absolute error is ± 0.24 Ω, and according to the formula (b.2), the maximum allowable relative error is ± 2.4%; at this time, the data of the impedance tester display value of 10.53 Ω is uploaded to the upper computer 3 through the data interface on the impedance tester or the artificial intelligence image recognition device 4 of the upper computer, and the upper computer 3 analyzes that the absolute error is 0.53 Ω and the relative error is 5.3%, so that the equipment error at the point of 10.00 Ω does not meet the requirement of precision grade. The upper computer outputs the unqualified result F of the impedance tester of the range.
According to the technical scheme, the automatic calibration system of the impedance tester comprises a standard resistor group 1, a program control line selection device 2 and an upper computer 3; the program control line selection device 2 selects from the standard resistor group 1 to realize automatic measurement of multiple groups of data, and the program control line selection device 2 outputs test data and uploads the data to the upper computer 3. If the impedance tester is not provided with a built-in processor and a communication interface, the upper computer 3 can read data on the impedance tester through the artificial intelligence image recognition device 4. The upper computer 3 can automatically analyze the error between the data uploaded by the impedance tester and the R value of the standard resistor, and record and store the data in the upper computer 3. And the upper computer 3 obtains whether the impedance tester is qualified or not after analyzing the plurality of groups of errors. The method has the advantages that the automatic calibration of the impedance tester can be realized by automatically switching, automatically processing and storing the test data in real time according to the preset calibration requirement in the calibration process, so that the impedance tester is automatically calibrated; the checking result is accurate and clear; this application facilitate promotion, no matter whether the impedance tester has communication interface can all realize the automatic check-up of impedance tester.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (4)
1. An automatic calibration system of an impedance tester is characterized by comprising a standard resistor group (1), a program control line selection device (2) and an upper computer (3); one end of the program control line selection device (2) is connected with the standard resistor group (1), and the other end of the program control line selection device (2) is connected with the upper computer (3);
the standard resistor group (1) consists of a plurality of groups of standard resistors, wherein each group of standard resistors respectively corresponds to different standard resistance values;
the upper computer (3) is configured to send instructions to the program-controlled line selection device (2) according to standard resistance values to be tested; the program control line selection device (2) is also configured to send an instruction to the impedance tester to be verified after being connected with the standard resistor, so that the impedance tester to be verified measures the standard resistor, and meanwhile, test data from the impedance tester to be verified is received for calculation and comparison to obtain a verification result;
the program control line selection device (2) is configured to select corresponding standard resistor connections in the standard resistor group (1) according to instructions sent by the upper computer (3).
2. The automatic calibration system of the impedance tester according to claim 1, wherein a communication interface is arranged on the program-controlled line selection device (2), and the communication interface is used for communicating with the upper computer (3) and the impedance tester to be calibrated.
3. The impedance tester automatic verification system according to claim 1, wherein the upper computer (3) is provided with a memory configured to store test data from the impedance tester to be verified.
4. The impedance tester automatic calibration system according to claim 1, wherein the impedance tester automatic calibration system is provided with an artificial intelligence image recognition device (4), and the artificial intelligence image recognition device (4) is configured to read out a test value of the impedance tester through intelligent image recognition and send the test value to the upper computer (3) when the impedance tester to be calibrated cannot communicate with the upper computer (3).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946394A (en) * | 2021-02-04 | 2021-06-11 | 国网湖北省电力有限公司检修公司 | Transformation detection test data unified communication standard interface conversion method |
| CN113280847A (en) * | 2021-04-20 | 2021-08-20 | 苏州华兴源创科技股份有限公司 | Verification method and verification system of test device, computer equipment and medium |
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|---|---|---|---|---|
| CN112946394A (en) * | 2021-02-04 | 2021-06-11 | 国网湖北省电力有限公司检修公司 | Transformation detection test data unified communication standard interface conversion method |
| CN113280847A (en) * | 2021-04-20 | 2021-08-20 | 苏州华兴源创科技股份有限公司 | Verification method and verification system of test device, computer equipment and medium |
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Application publication date: 20200922 |
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