CN206292382U - Calibration device for resistance tester - Google Patents
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Abstract
Description
技术领域technical field
本实用新型涉及电阻测试仪领域，尤其涉及一种电阻测试仪校准装置。The utility model relates to the field of resistance testers, in particular to a calibration device for resistance testers.
背景技术Background technique
回路电阻测试仪和直阻仪是电力设备设施检测的常用设备。回路电阻测试仪是用于测量开关、断路器、变压器等设备的接触电阻、回路电阻的专用测试设备，其测试电流为100A或更大的直流电流，也被称为“接触电阻测试仪”。直阻仪是用于测量变压器、互感器、电机绕组等感性被测对象的直流电阻的专用测试设备，也被称为“直流电阻快速测试仪”。接地导通电阻测试仪是用于测量交流电网供电的电器设备(如家用电器、电动电热器具、医用电气设备及测量、控制和实验室用电气设备等)的可触及金属壳体与该设备引出的安全接地端(线)之间导通电阻的仪器。回路电阻测试仪、直阻仪和接地导通电阻测试仪都是测量低阻值电阻的仪器，它们在电子电气保障中起着非常重要的作用，因此需定期进行检定和校准。Loop resistance tester and direct resistance meter are common equipment for testing electric equipment and facilities. The loop resistance tester is a special test equipment used to measure the contact resistance and loop resistance of switches, circuit breakers, transformers and other equipment. Its test current is 100A or greater DC current, also known as "contact resistance tester". The direct resistance tester is a special test equipment for measuring the direct current resistance of inductive test objects such as transformers, transformers, and motor windings. It is also called "direct current resistance tester". The ground connection resistance tester is used to measure the contact between the accessible metal casing and the outlet of the electrical equipment powered by the AC grid (such as household appliances, electric heating appliances, medical electrical equipment, and electrical equipment for measurement, control and laboratory use, etc.). An instrument that measures the on-resistance between the safety ground terminals (lines). Loop resistance tester, direct resistance tester and grounding resistance tester are all instruments for measuring low-value resistance. They play a very important role in electronic and electrical protection, so they need to be verified and calibrated regularly.
现有的校准装置是采用模拟调节电阻的大小供电阻测试仪测量校准。The existing calibration device uses analog to adjust the size of the resistance for the resistance tester to measure and calibrate.
然而，现有技术有一定缺陷，就是采用模拟调节电阻的精度比较低，而且只能校准某一类低阻值测试仪，测量功能单一。However, the existing technology has certain defects, that is, the accuracy of the analog adjustment resistor is relatively low, and only a certain type of low resistance tester can be calibrated, and the measurement function is single.
实用新型内容Utility model content
本实用新型实施例公开了一种电阻测试仪校准装置，通过宽频直流比较仪将电阻测试仪输出的大电流转换成小电流，然后通过精密电阻将小电流转换成小电压，再经过电压采样及增益模块放大成比例电压信号输入到分压模块，由控制器控制其分压比从而实现电阻阻值的数字调节，最后经过缓冲电路输出给被测仪器的电压采样端，形成测试回路，将电阻测试仪测出的电阻大小与控制器运算出的电阻相比较并对电阻测试仪进行校准，解决了现有技术中采用模拟调节电阻的精度比较低，而且只能校准某一类低阻值测试仪，测量功能单一的技术问题。The embodiment of the utility model discloses a resistance tester calibration device, which converts the large current output by the resistance tester into a small current through a broadband DC comparator, and then converts the small current into a small voltage through a precision resistor, and then undergoes voltage sampling and The gain module amplifies the proportional voltage signal and inputs it to the voltage divider module. The controller controls the voltage divider ratio to realize the digital adjustment of the resistance value, and finally outputs it to the voltage sampling terminal of the instrument under test through the buffer circuit to form a test loop. The resistance measured by the tester is compared with the resistance calculated by the controller and the resistance tester is calibrated, which solves the problem that the accuracy of analog adjustment resistance in the prior art is relatively low, and only a certain type of low resistance test can be calibrated instrument, a technical problem with a single measurement function.
本实用新型实施例提供了一种电阻测试仪校准装置，包括：A/D采样模块、控制模块、依次电性连接的宽频直流比较仪、精密电阻、电压采样及增益模块、分压模块；The embodiment of the utility model provides a calibration device for a resistance tester, comprising: an A/D sampling module, a control module, a broadband DC comparator electrically connected in sequence, a precision resistor, a voltage sampling and gain module, and a voltage dividing module;
所述分压模块、所述A/D采样模块分别与控制器通信连接；The voltage dividing module and the A/D sampling module are respectively connected to the controller in communication;
所述A/D采样模块与所述电压采样及增益模块通信连接。The A/D sampling module is communicatively connected with the voltage sampling and gain module.
从以上技术方案可以看出，本实用新型实施例具有以下优点：As can be seen from the above technical solutions, the utility model embodiment has the following advantages:
1、通过宽频直流比较仪将电阻测试仪输出的大电流转换成小电流，然后通过精密电阻将小电流转换成小电压，再经过电压采样及增益模块放大成比例电压信号输入到分压模块，由控制器控制其分压比从而实现电阻阻值的数字调节，最后经过缓冲电路输出给被测仪器的电压采样端，形成测试回路，将电阻测试仪测出的电阻大小与控制器运算出的电阻相比较并对电阻测试仪进行校准，解决了现有技术中采用模拟调节电阻的精度比较低，而且只能校准某一类低阻值测试仪，测量功能单一的技术问题。1. Convert the large current output by the resistance tester into a small current through a broadband DC comparator, and then convert the small current into a small voltage through a precision resistor, and then amplify the proportional voltage signal through the voltage sampling and gain module and input it to the voltage divider module. The controller controls the voltage division ratio to realize the digital adjustment of the resistance value, and finally outputs it to the voltage sampling terminal of the instrument under test through the buffer circuit to form a test loop, and compares the resistance measured by the resistance tester with the value calculated by the controller. The resistance is compared and the resistance tester is calibrated, which solves the technical problems in the prior art that the accuracy of the analog adjustment resistance is relatively low, and only a certain type of low resistance tester can be calibrated, and the measurement function is single.
2、本实用新型实施例通过控制器控制其分压比从而实现电阻阻值的数字调节，不仅进度高，而且测量范围广。2. The embodiment of the utility model realizes the digital adjustment of the resistance value through the controller to control the voltage division ratio, which not only has a high progress, but also has a wide measurement range.
3、宽频直流比较仪的设置将电阻测试仪的大电流转换成小电流，相比于只采集电压信号而电流依然很大的电压型有源模拟电阻器，大大降低了电路功耗，而且避免了无源标准电阻器在大电流测试时温漂影响。3. The setting of the broadband DC comparator converts the large current of the resistance tester into a small current, which greatly reduces the power consumption of the circuit and avoids The effect of temperature drift of passive standard resistors in high current testing is eliminated.
4、本实用新型实施例提供的电阻测试仪校准装置体积小、重量轻，便于携带，且连线简单、操作便捷，可同时适用于现场和实验室检测。4. The resistance tester calibration device provided by the embodiment of the utility model is small in size, light in weight, easy to carry, simple in connection and convenient in operation, and can be applied to field and laboratory testing at the same time.
5、本实用新型实施例提供的电阻测试仪校准装置功能完备，可实现回路电阻测试仪、直阻仪和接地导通电阻测试仪等低阻值测试仪的校准。5. The resistance tester calibration device provided by the embodiment of the utility model has complete functions, and can realize the calibration of low-resistance testers such as loop resistance testers, direct resistance testers, and grounding resistance testers.
附图说明Description of drawings
为了更清楚地说明本实用新型实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其它的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.
图1为本实用新型实施例中提供的一种电阻测试仪校准装置的结构示意图。FIG. 1 is a schematic structural diagram of a calibration device for a resistance tester provided in an embodiment of the present invention.
具体实施方式detailed description
本实用新型实施例公开了一种电阻测试仪校准装置，通过宽频直流比较仪将电阻测试仪输出的大电流转换成小电流，然后通过精密电阻将小电流转换成小电压，再经过电压采样及增益模块放大成比例电压信号输入到分压模块，由控制器控制其分压比从而实现电阻阻值的数字调节，最后经过缓冲电路输出给被测仪器的电压采样端，形成测试回路，将电阻测试仪测出的电阻大小与控制器运算出的电阻相比较并对电阻测试仪进行校准，解决了现有技术中采用模拟调节电阻的精度比较低，而且只能校准某一类低阻值测试仪，测量功能单一的技术问题。The embodiment of the utility model discloses a resistance tester calibration device, which converts the large current output by the resistance tester into a small current through a broadband DC comparator, and then converts the small current into a small voltage through a precision resistor, and then undergoes voltage sampling and The gain module amplifies the proportional voltage signal and inputs it to the voltage divider module. The controller controls the voltage divider ratio to realize the digital adjustment of the resistance value, and finally outputs it to the voltage sampling terminal of the instrument under test through the buffer circuit to form a test loop. The resistance measured by the tester is compared with the resistance calculated by the controller and the resistance tester is calibrated, which solves the problem that the accuracy of analog adjustment resistance in the prior art is relatively low, and only a certain type of low resistance test can be calibrated instrument, a technical problem with a single measurement function.
请参阅图1，本实用新型实施例中提供的一种电阻测试仪校准装置的一个实施例包括：A/D采样模块4、控制模块6、依次电性连接的宽频直流比较仪1、精密电阻2、电压采样及增益模块3、分压模块5；Please refer to Fig. 1, an embodiment of a resistance tester calibration device provided in the embodiment of the present invention includes: A/D sampling module 4, control module 6, broadband DC comparator 1 electrically connected in turn, precision resistance 2. Voltage sampling and gain module 3. Voltage divider module 5;
分压模块5、A/D采样模块4分别与控制模块6通信连接；The voltage divider module 5 and the A/D sampling module 4 are respectively connected to the control module 6 by communication;
A/D采样模块4与电压采样及增益模块3通信连接。The A/D sampling module 4 is communicatively connected with the voltage sampling and gain module 3 .
上面是对一种电阻测试仪校准装置的结构和连接方式进行的详细说明，为便于理解，下面将以一具体应用场景对一种电阻测试仪校准装置的应用进行说明，应用例包括：The above is a detailed description of the structure and connection method of a resistance tester calibration device. For ease of understanding, the application of a resistance tester calibration device will be described below in a specific application scenario. Application examples include:
将电阻测试仪校准装置的宽频直流比较仪1与电阻测试仪的电流输出端连接，将电阻测试仪校准装置的分压模块5与电阻测试仪的电压输入端连接，然后宽频直流比较仪1将电阻测试仪输出大电流I1转换成小电流I2，宽频直流比较仪1变比k为然后小电流I2经过精密电阻2电路后得到电压U2，R为精密电阻2的阻值，电压U2经过电压采样及增益模块3后得到电压U3，其中k1为经过电压采样及增益模块3后电压信号的放大比例系数，然后A/D采样模块4获取电压U3，然后通过控制模块6运算与电压U3对应的示值电流并做相应的分析，电压U3经过分压模块5时，分压模块5按照控制模块6设定的分压系数k2进行分压并输出电压值U1，则电阻测试仪校准装置相当于的标准电阻，然后将R1与电阻测试仪测量的电阻相比较，对电阻测试仪进行校准。Connect the broadband DC comparator 1 of the resistance tester calibration device with the current output terminal of the resistance tester, connect the voltage divider module 5 of the resistance tester calibration device with the voltage input terminal of the resistance tester, and then the broadband DC comparator 1 will The resistance tester outputs a large current I 1 and converts it into a small current I 2 , and the conversion ratio k of the broadband DC comparator 1 is Then the small current I 2 passes through the precision resistor 2 circuit to get the voltage U 2 , R is the resistance value of the precision resistor 2, the voltage U 2 is obtained after the voltage sampling and the gain module 3, the voltage U 3 , Among them, k 1 is the amplification ratio coefficient of the voltage signal after the voltage sampling and gain module 3, and then the A/D sampling module 4 obtains the voltage U 3 , and then calculates the indication current corresponding to the voltage U 3 through the control module 6 and performs corresponding Analysis, when the voltage U 3 passes through the voltage divider module 5, the voltage divider module 5 divides the voltage according to the voltage divider coefficient k 2 set by the control module 6 and outputs the voltage value U 1 , Then the resistance tester calibration device is equivalent to The standard resistance, and then compare R1 with the resistance measured by the resistance tester to calibrate the resistance tester.
以上对本实用新型所提供的一种电阻测试仪校准装置进行了详细介绍，对于本领域的一般技术人员，依据本实用新型实施例的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本实用新型的限制。The calibration device for a resistance tester provided by the utility model has been introduced in detail above. For those of ordinary skill in the art, according to the idea of the utility model embodiment, there will be changes in the specific implementation and application range. In summary, the contents of this specification should not be construed as limiting the utility model.
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| 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 |
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| 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 |
| CN116368388A (en) * | 2020-07-27 | 2023-06-30 | 技术应用股份公司 | Self-calibration system and procedure for automatic loop resistance measuring device |
| CN116413491A (en) * | 2023-03-02 | 2023-07-11 | 上海肇芾精工电子仪器有限公司 | A wide-range high-precision self-adaptive measurement system and method |
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| 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 |
| US12019107B2 (en) * | 2020-02-05 | 2024-06-25 | Megger Instruments Ltd | Measuring loop resistance |
| CN116368388A (en) * | 2020-07-27 | 2023-06-30 | 技术应用股份公司 | Self-calibration system and procedure for automatic loop resistance measuring device |
| CN116368388B (en) * | 2020-07-27 | 2025-11-14 | 技术应用股份公司 | Self-calibration system and program for automatic loop resistance measuring device |
| 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 |
| CN116413491A (en) * | 2023-03-02 | 2023-07-11 | 上海肇芾精工电子仪器有限公司 | A wide-range high-precision self-adaptive measurement system and method |
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