CN206292382U - A kind of resistance meter calibrating installation - Google Patents

A kind of resistance meter calibrating installation Download PDF

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Publication number
CN206292382U
CN206292382U CN201621328545.6U CN201621328545U CN206292382U CN 206292382 U CN206292382 U CN 206292382U CN 201621328545 U CN201621328545 U CN 201621328545U CN 206292382 U CN206292382 U CN 206292382U
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China
Prior art keywords
resistance
resistance meter
voltage
calibrating installation
meter
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Active
Application number
CN201621328545.6U
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Chinese (zh)
Inventor
陈昕
周新华
周哲玲
刘高
李毅
吴萍
高培丰
黄璐雅
余英芝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changsha Tunkia Measurement And Control Technology Co ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
Original Assignee
Changsha Tunkia Measurement And Control Technology Co ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN201621328545.6U priority Critical patent/CN206292382U/en
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Abstract

The utility model embodiment discloses a kind of resistance meter calibrating installation, the high current that resistance meter is exported is converted into by low current by wideband DC comparator, then low current is converted into by small voltage by precision resistance, proportional voltage signal is zoomed into by voltage sample and gain module be input to division module again, its intrinsic standoff ratio is controlled so as to realize the digital regulated of resistance by controller, buffer circuit is eventually passed to export to the voltage sample end of tested instrument, form test loop, the resistance sizes that resistance meter is measured compare with the resistance that controller is calculated and resistance meter are calibrated, the ratio of precision solved in the prior art using analog regulation resistance is relatively low, and a certain class low-resistance value tester can only be calibrated, measure the technical problem of unitary function.

Description

A kind of resistance meter calibrating installation
Technical field
The utility model is related to resistance meter field, more particularly to a kind of resistance meter calibrating installation.
Background technology
Circuit resistance tester and straight resistance instrument are the common equipments of power equipment facility detection.Circuit resistance tester is to use In measurement switch, breaker, the contact resistance of the equipment such as transformer, loop resistance special test equipment, it is tested electric current and is 100A or bigger DC current, also referred to as " contact resistance tester ".Straight resistance instrument be for measuring transformer, transformer, The special test equipment of the D.C. resistance of the perception measurand such as machine winding, also referred to as " D.C. resistance high speed tester ". Earth-continuity tester is for measuring electric equipment that AC network powers (such as household electrical appliance, electronic electric heating appliance, doctor Electrical installation and measurement, control and use for laboratory electrical equipment etc.) accessible metal shell and equipment extraction safety The instrument of conducting resistance between earth terminal (line).Circuit resistance tester, straight resistance instrument and earth-continuity tester are all to survey The instrument of low resistance resistance is measured, they play very important effect in electric guarantee, therefore need to periodically be examined and determine And calibration.
Existing calibrating installation is to measure calibration for resistance meter using the size of analog regulation resistance.
However, prior art has certain defect, it is exactly relatively low using the ratio of precision of analog regulation resistance, and can only calibrate A certain class low-resistance value tester, measures unitary function.
Utility model content
The utility model embodiment discloses a kind of resistance meter calibrating installation, by wideband DC comparator by resistance The high current of tester output is converted into low current, and low current then is converted into small voltage by precision resistance, then by electricity Pressure sampling and gain module zoom into proportional voltage signal and are input to division module, and its intrinsic standoff ratio is controlled so as to realize by controller Resistance it is digital regulated, eventually pass buffer circuit and export to the voltage sample end of tested instrument, form test loop, will The resistance sizes that resistance meter is measured are calibrated compared with the resistance that controller is calculated and to resistance meter, are solved Ratio of precision in the prior art using analog regulation resistance is relatively low, and can only calibrate a certain class low-resistance value tester, measures The technical problem of unitary function.
The utility model embodiment provides a kind of resistance meter calibrating installation, including:A/D sampling modules, control mould Block, the wideband DC comparator being electrically connected with successively, precision resistance, voltage sample and gain module, division module;
The division module, the A/D sampling modules are communicated to connect with controller respectively;
The A/D sampling modules are communicated to connect with the voltage sample and gain module.
As can be seen from the above technical solutions, the utility model embodiment has advantages below:
1st, the high current that resistance meter is exported is converted into by low current by wideband DC comparator, then by precision Low current is converted into small voltage by resistance, then is zoomed into proportional voltage signal by voltage sample and gain module and be input to partial pressure Module, its intrinsic standoff ratio is controlled so as to realize the digital regulated of resistance by controller, is eventually passed buffer circuit and is exported to quilt The voltage sample end of instrument is surveyed, test loop, the electricity that the resistance sizes that resistance meter is measured are calculated with controller is formed Resistance compares and resistance meter is calibrated, and the ratio of precision solved in the prior art using analog regulation resistance is relatively low, And a certain class low-resistance value tester can only be calibrated, measure the technical problem of unitary function.
2nd, the utility model embodiment controls its intrinsic standoff ratio so as to realize the digital regulated of resistance by controller, no Only progress is high, and measurement range is wide.
The high current of resistance meter is converted into low current by the 3rd, setting of wideband DC comparator, compared to only collection electricity Pressure signal and the still very big voltage type active artifical resistance device of electric current, greatly reduce circuit power consumption, and avoid passive Calibration resistor temperature drift influence in high-current test.
4th, the resistance meter calibrating installation small volume, lightweight that the utility model embodiment is provided, is easy to carry, and even Line is simple, simple operation, can simultaneously be applied to scene and test in laboratory.
5th, the resistance meter calibrating installation complete function that the utility model embodiment is provided, is capable of achieving loop resistance test The calibration of the low-resistance value tester such as instrument, straight resistance instrument and earth-continuity tester.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of resistance meter calibrating installation of offer in the utility model embodiment.
Specific embodiment
The utility model embodiment discloses a kind of resistance meter calibrating installation, by wideband DC comparator by resistance The high current of tester output is converted into low current, and low current then is converted into small voltage by precision resistance, then by electricity Pressure sampling and gain module zoom into proportional voltage signal and are input to division module, and its intrinsic standoff ratio is controlled so as to realize by controller Resistance it is digital regulated, eventually pass buffer circuit and export to the voltage sample end of tested instrument, form test loop, will The resistance sizes that resistance meter is measured are calibrated compared with the resistance that controller is calculated and to resistance meter, are solved Ratio of precision in the prior art using analog regulation resistance is relatively low, and can only calibrate a certain class low-resistance value tester, measures The technical problem of unitary function.
Fig. 1 is referred to, a kind of one embodiment for the resistance meter calibrating installation provided in the utility model embodiment Including:A/D sampling modules 4, control module 6, the wideband DC comparator 1 being electrically connected with successively, precision resistance 2, voltage sample And gain module 3, division module 5;
Division module 5, A/D sampling modules 4 are communicated to connect with control module 6 respectively;
A/D sampling modules 4 are communicated to connect with voltage sample and gain module 3.
The above is the detailed description carried out to the structure and connected mode of a kind of resistance meter calibrating installation, for ease of reason Solution, will be illustrated with a concrete application scene to a kind of application of resistance meter calibrating installation below, and application examples includes:
The wideband DC comparator 1 of resistance meter calibrating installation is connected with the current output terminal of resistance meter, will The division module 5 of resistance meter calibrating installation is connected with the voltage input end of resistance meter, then wideband DC comparator 1 By resistance meter output high current I1It is converted into low current I2, the no-load voltage ratio k of wideband DC comparator 1 isThen low current I2Through Voltage U is obtained after crossing the circuit of precision resistance 22,R is the resistance of precision resistance 2, voltage U2Through overvoltage Voltage U is obtained after sampling and gain module 33,Wherein k1It is by voltage sample and gain mould The magnification ratio coefficient of voltage signal after block 3, then A/D sampling modules 4 obtain voltage U3, then by the computing of control module 6 With voltage U3Corresponding indicating value electric current simultaneously does corresponding analysis, voltage U3During by division module 5, division module 5 is according to control mould The partial pressure coefficient k of the setting of block 62Carry out partial pressure and output voltage values U1,Then resistance test Instrument calibrating installation equivalent toMeasuring resistance, then by R1The resistance phase measured with resistance meter Compare, resistance meter is calibrated.
A kind of resistance meter calibrating installation provided by the utility model is described in detail above, for ability The those skilled in the art in domain, according to the thought of the utility model embodiment, have in specific embodiments and applications Change part, in sum, this specification content should not be construed as to limitation of the present utility model.

Claims (1)

1. a kind of resistance meter calibrating installation, it is characterised in that including:A/D sampling modules, control module, electrically connect successively Wideband DC comparator, precision resistance, voltage sample and gain module, the division module for connecing;
The division module, the A/D sampling modules are communicated to connect with controller respectively;
The A/D sampling modules are communicated to connect with the voltage sample and gain module.
CN201621328545.6U 2016-12-02 2016-12-02 A kind of resistance meter calibrating installation Active CN206292382U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621328545.6U CN206292382U (en) 2016-12-02 2016-12-02 A kind of resistance meter calibrating installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621328545.6U CN206292382U (en) 2016-12-02 2016-12-02 A kind of resistance meter calibrating installation

Publications (1)

Publication Number Publication Date
CN206292382U true CN206292382U (en) 2017-06-30

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106918795A (en) * 2017-03-21 2017-07-04 哈尔滨工业大学 Precision resister calibration system based on FPGA and the resistance calibrating method using system realization
CN107728092A (en) * 2017-10-02 2018-02-23 国网山西省电力公司电力科学研究院 The automatic precision pre-check device and method of calibration of Transformer Winding no-load voltage ratio tester
CN107976647A (en) * 2018-01-24 2018-05-01 镇江市计量实验工厂 A kind of high-voltage high resistance calibrating instrument intelligence calibrating installation
CN108710096A (en) * 2018-08-22 2018-10-26 深圳德晋科技有限公司 Earth-continuity tester calibrating installation
CN109444544A (en) * 2018-11-02 2019-03-08 国网辽宁省电力有限公司丹东供电公司 A kind of portable constant temperature D.C. resistance calibration equipment
CN111044963A (en) * 2019-12-31 2020-04-21 长沙天恒测控技术有限公司 High-frequency current sensor calibration method and device adopting coaxial shunt
CN113504467A (en) * 2021-07-23 2021-10-15 国网江苏省电力有限公司宿迁供电分公司 High-precision waveform inversion system
US20220357380A1 (en) * 2020-02-05 2022-11-10 Megger Instruments Ltd Measuring loop resistance
CN116125163A (en) * 2022-12-05 2023-05-16 中国南方电网有限责任公司超高压输电公司广州局 Resistance testing device and resistance testing method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106918795A (en) * 2017-03-21 2017-07-04 哈尔滨工业大学 Precision resister calibration system based on FPGA and the resistance calibrating method using system realization
CN106918795B (en) * 2017-03-21 2019-04-12 哈尔滨工业大学 Precision resister calibration system based on FPGA and the resistance calibrating method using system realization
CN107728092A (en) * 2017-10-02 2018-02-23 国网山西省电力公司电力科学研究院 The automatic precision pre-check device and method of calibration of Transformer Winding no-load voltage ratio tester
CN107976647A (en) * 2018-01-24 2018-05-01 镇江市计量实验工厂 A kind of high-voltage high resistance calibrating instrument intelligence calibrating installation
CN108710096A (en) * 2018-08-22 2018-10-26 深圳德晋科技有限公司 Earth-continuity tester calibrating installation
CN109444544A (en) * 2018-11-02 2019-03-08 国网辽宁省电力有限公司丹东供电公司 A kind of portable constant temperature D.C. resistance calibration equipment
CN111044963A (en) * 2019-12-31 2020-04-21 长沙天恒测控技术有限公司 High-frequency current sensor calibration method and device adopting coaxial shunt
CN111044963B (en) * 2019-12-31 2021-12-21 长沙天恒测控技术有限公司 High-frequency current sensor calibration method and device adopting coaxial shunt
US20220357380A1 (en) * 2020-02-05 2022-11-10 Megger Instruments Ltd Measuring loop resistance
CN113504467A (en) * 2021-07-23 2021-10-15 国网江苏省电力有限公司宿迁供电分公司 High-precision waveform inversion system
CN116125163A (en) * 2022-12-05 2023-05-16 中国南方电网有限责任公司超高压输电公司广州局 Resistance testing device and resistance testing method

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