CN201477160U - Resistance box automatic calibration system - Google Patents

Resistance box automatic calibration system Download PDF

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CN201477160U
CN201477160U CN2009201731441U CN200920173144U CN201477160U CN 201477160 U CN201477160 U CN 201477160U CN 2009201731441 U CN2009201731441 U CN 2009201731441U CN 200920173144 U CN200920173144 U CN 200920173144U CN 201477160 U CN201477160 U CN 201477160U
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resistance
resistance box
standard
voltage
calibration system
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臧景茹
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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North China Electric Power Research Institute Co Ltd
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Abstract

本实用新型涉及一种电阻箱自动校验系统。所述电阻箱自动校验系统包括:电压测量装置、电流提供装置、标准电阻组、电阻箱、电路切换控制装置;电路切换控制装置用于控制标准电阻组中的一者接入回路,控制将电压测量装置连接到标准电阻组中选择接入回路的电阻和所述电阻箱上的被测电阻两者中的一者;电流提供装置与电路切换控制装置、标准电阻与电阻箱上的被测电阻串联后组成闭合回路;电压测量装置用于测量被接入到电路中的标准电阻两端的电压或所述电阻箱上的被测电阻的两端的电压。本电阻箱自动校验系统解决了现有技术中频繁在标准电阻和被检电阻箱之间进行电路切换的问题,通过本系统,实现了电路自动切换,改善了工作条件,提高了工作效率。

Figure 200920173144

The utility model relates to an automatic calibration system for a resistance box. The resistance box automatic calibration system includes: a voltage measuring device, a current supply device, a standard resistance group, a resistance box, and a circuit switching control device; the circuit switching control device is used to control one of the standard resistance groups to access the loop, and the The voltage measurement device is connected to one of the resistance selected into the loop in the standard resistance group and the measured resistance on the resistance box; the current supply device and the circuit switching control device, the standard resistance and the measured resistance on the resistance box The resistors are connected in series to form a closed loop; the voltage measuring device is used to measure the voltage across the standard resistor connected to the circuit or the voltage across the measured resistor on the resistance box. This resistance box automatic calibration system solves the problem of frequent circuit switching between the standard resistance and the tested resistance box in the prior art. Through this system, the automatic switching of the circuit is realized, the working conditions are improved, and the work efficiency is improved.

Figure 200920173144

Description

电阻箱自动校验系统 Resistance box automatic calibration system

技术领域technical field

本实用新型涉及电阻箱校验技术,尤其涉及一种电阻箱自动校验系统。The utility model relates to a resistance box calibration technology, in particular to an automatic calibration system for a resistance box.

背景技术Background technique

目前,电阻箱的检定主要依赖于手动检定。图1为现有的电阻箱自动校验系统的结构框图,如图1所示,现有的电阻箱校验系统由电阻箱Rx、直流数字电压表、内置有一组标准电阻(例如R1、R2……Rn)的直流电流源组成。如图2所示,现有的电阻箱自动校验系统中的内置有标准电阻组的直流电流源示意图。现有电阻箱校验系统的电路这样实现:1)在连接电路时,通过手动接线,将电流源与内置在电流源内部的标准电阻组中的某个电阻以及电阻箱的待测电阻连接组成闭合回路,将数字电压表连接在所述标准电阻的两端,测得电压数据,计算回路电流;2)保持电流源输出电流不变,将数字电压表连接在电阻箱上的待测电阻两端,再次测得电压数据;3)交替重复1)、2)直到电阻箱上的所有待测电阻都被测量。At present, the verification of the resistance box mainly relies on manual verification. Fig. 1 is the structural block diagram of the existing resistance box automatic calibration system, as shown in Fig. 1, the existing resistance box calibration system consists of a resistance box Rx, a DC digital voltmeter, and a set of standard resistors (such as R 1 , R 2 ... R n ) DC current source composition. As shown in FIG. 2 , a schematic diagram of a DC current source with a built-in standard resistance group in an existing resistance box automatic calibration system. The circuit of the existing resistance box calibration system is implemented as follows: 1) When connecting the circuit, the current source is connected with a certain resistance in the standard resistance group built in the current source and the resistance to be measured in the resistance box through manual wiring. Close the loop, connect the digital voltmeter to the two ends of the standard resistance, measure the voltage data, and calculate the loop current; 2) keep the output current of the current source constant, connect the digital voltmeter to the resistance box to be measured 3) Repeat 1) and 2) alternately until all the resistances to be measured on the resistance box are measured.

校验电阻箱的步骤如下:The steps to calibrate the resistance box are as follows:

(1)标定电流源的输出电流。根据要检定的测量盘,选择相应的标准电阻,将电压表接在标准电阻Rn两端,电流源输出相应的电流I,读取电压表示值Un通过

Figure G2009201731441D00011
计算得到电流源的实际输出电流。(1) Calibrate the output current of the current source. According to the measuring panel to be verified, select the corresponding standard resistance, connect the voltmeter to both ends of the standard resistance R n , the current source outputs the corresponding current I, and read the voltage representation value U n through
Figure G2009201731441D00011
Calculate the actual output current of the current source.

(2)检定电阻箱的电阻。电流源的输出电流不变,将电压表接在被检电阻箱两端,读取电压表示值Ux,使用运算公式计算得到被检电阻的实际值。(2) Verify the resistance of the resistance box. The output current of the current source remains unchanged, connect the voltmeter to both ends of the resistance box under test, read the voltage representation value U x , and use the formula Calculate the actual value of the tested resistance.

通过步骤(1)、(2)检定电阻箱的所有电阻。Verify all resistances of the resistance box through steps (1) and (2).

(3)对每个阻值的计算结果进行修约。(3) Round off the calculated results of each resistance value.

(4)计算每个电阻的相对误差。对各盘每个电阻,按公式

Figure G2009201731441D00021
计算相对误差,其中R是示值(标称值),Rx是实际值,σ是相对误差。根据相对误差判定各盘每个电阻是否符合所在测量盘的准确度等级。(4) Calculate the relative error of each resistor. For each resistance of each plate, according to the formula
Figure G2009201731441D00021
Calculate the relative error, where R is the indicated value (nominal value), R x is the actual value, and σ is the relative error. According to the relative error, it is judged whether each resistance of each disc meets the accuracy level of the measuring disc.

(5)出具检定证书。将电阻箱信息、检定环境条件、电阻箱的所有电阻的检定结果等一一录入证书中。(5) Issue a verification certificate. Enter the information of the resistance box, the test environment conditions, the test results of all resistances of the resistance box, etc. into the certificate one by one.

从以上工作步骤可见,在检校验电阻箱时,使用现有的校验系统需要频繁在标准电阻和被检电阻箱之间进行电路切换,工作量很大,数据运算和修约由人工完成很容易引起差错。另外,目前的检定系统中所使用的标准电阻是内附在直流电流源中的,年稳定性较差,直接影响检定结果的可靠性。From the above work steps, it can be seen that when checking and calibrating the resistance box, using the existing calibration system requires frequent circuit switching between the standard resistance and the tested resistance box, the workload is very large, and the data calculation and repair are done manually It is easy to make mistakes. In addition, the standard resistance used in the current verification system is attached to the DC current source, and its stability is poor, which directly affects the reliability of the verification results.

实用新型内容Utility model content

本实用新型的目的提出一种电阻箱自动校验系统,以解决现有技术中检定过程中需要频繁在标准电阻和被检电阻箱之间进行电路切换的问题。The purpose of this utility model is to propose an automatic calibration system for a resistance box to solve the problem of frequent circuit switching between the standard resistance and the tested resistance box during the verification process in the prior art.

所述电阻箱自动校验系统包括:电压测量装置、电流提供装置、标准电阻组、电阻箱、电路切换控制装置;The resistance box automatic calibration system includes: a voltage measurement device, a current supply device, a standard resistance group, a resistance box, and a circuit switching control device;

其中,所述电路切换控制装置用于控制将所述标准电阻组中的一者接入回路,控制将电压测量装置连接到标准电阻组中选择接入回路的电阻和所述电阻箱上的被测电阻两者中的一者;Wherein, the circuit switching control device is used to control one of the standard resistance groups to be connected to the loop, and to control the connection of the voltage measurement device to the resistance selected to be connected to the loop in the standard resistance group and the resistor on the resistance box. One of the two measuring resistance;

所述电流提供装置与电路切换控制装置、标准电阻与电阻箱上的被测电阻串联后组成闭合回路;The current supply device, the circuit switching control device, the standard resistance and the measured resistance on the resistance box are connected in series to form a closed loop;

所述电压测量装置用于测量被接入到电路中的所述标准电阻两端的电压或所述电阻箱上的被测电阻的两端的电压。The voltage measuring device is used to measure the voltage across the standard resistor connected to the circuit or the voltage across the measured resistor on the resistance box.

本实用新型的有益效果在于,本实用新型提供的电阻箱自动校验系统解决了现有技术中频繁在标准电阻和被检电阻箱之间进行电路切换的问题,通过使用电阻箱自动校验系统,实现了电路自动切换,改善了工作条件,提高工作效率。The beneficial effect of the utility model is that the resistance box automatic calibration system provided by the utility model solves the problem of frequent circuit switching between the standard resistance and the tested resistance box in the prior art. By using the resistance box automatic calibration system , Realized automatic circuit switching, improved working conditions and increased work efficiency.

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具他的附图。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 obtain other drawings based on these drawings without any creative effort.

图1为现有的电阻箱自动校验系统的结构框图;Fig. 1 is the structural block diagram of existing resistance box automatic calibration system;

图2为现有的电阻箱自动校验系统中的内置有标准电阻组的直流电流源示意图;Fig. 2 is a schematic diagram of a DC current source with a built-in standard resistance group in the existing resistance box automatic calibration system;

图3为本实用新型实施例提供的电阻箱自动校验系统的结构框图;Fig. 3 is the structural block diagram of the resistance box automatic calibration system that the utility model embodiment provides;

图4为本实用新型实施例提供的电阻箱自动校验系统的结构图;Fig. 4 is the structural diagram of the resistance box automatic calibration system that the utility model embodiment provides;

图5为本实用新型实施例提供的电阻箱自动校验系统的数据处理装置的结构框图;Fig. 5 is the structural block diagram of the data processing device of the resistance box automatic calibration system that the utility model embodiment provides;

图6为本实用新型实施例提供的电阻箱自动校验系统的电路切换装置的结构图。Fig. 6 is a structural diagram of the circuit switching device of the resistance box automatic calibration system provided by the embodiment of the present invention.

具体实施方式Detailed ways

下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

实施例Example

图3为本实用新型实施例提供的电阻箱自动校验系统的结构框图。所述系统包括:电压表、电流源、标准电阻、包含多个被测电阻Rx的电阻箱、电路切换控制装置。电路切换控制装置用于控制标准电阻组中的一者接入回路,控制将电压测量装置连接到标准电阻组中选择接入回路的电阻和所述电阻箱上的被测电阻两者中的一者;电流提供装置与电路切换控制装置、标准电阻与电阻箱上的被测电阻串联后组成闭合回路;电压测量装置用于测量被接入到电路中的所述标准电阻两端的电压或所述电阻箱上的被测电阻的两端的电压。Fig. 3 is a structural block diagram of the resistance box automatic calibration system provided by the embodiment of the present invention. The system includes: a voltmeter, a current source, a standard resistance, a resistance box containing a plurality of measured resistances Rx, and a circuit switching control device. The circuit switching control device is used to control one of the standard resistance groups to be connected to the loop, and to control the connection of the voltage measuring device to one of the resistance connected to the loop and the resistance to be measured on the resistance box in the standard resistance group. Or; the current supply device and the circuit switching control device, the standard resistance and the measured resistance on the resistance box are connected in series to form a closed loop; the voltage measuring device is used to measure the voltage at both ends of the standard resistance connected to the circuit or the The voltage across the resistance being measured on the resistance box.

如图4为本实用新型实施例提供的电阻箱自动校验系统的结构图,图4在图3提供的实施例的基础上增加了数据处理装置,所述具体为图中显示的计算机,也可为其他移动终端,如PDA等。所述电流提供装置、所述电压测量装置、所述电路切换装置分别与所述数据处理装置相连。例如,所述电压测量装置与所述数据处理装置之间的接口为通用接口总线接口(GPIB接口);所述电流源与所述数据处理装置之间的接口为通用接口总线接口;所述电路切换装置与所述数据处理装置之间的接口为串口。如图5所述数据处理装置包括:状态控制单元501,用于控制电压测量装置和电流提供装置的开闭状态;选择单元502,用于选择电压测量装置和电流提供装置的工作量程;数据获取单元503,用于获取所述电流提供装置、所述电压测量装置的数据;数据计算及处理单元504,用于根据获取的数据计算得出电阻箱的上各待测电阻的阻值、阻值误差。所述数据处理装置还包括报告出具单元505(图未示),用于根据电阻箱的各待测电阻的阻值、阻值误差出具校验报告。Figure 4 is a structural diagram of the resistance box automatic calibration system provided by the embodiment of the present invention, Figure 4 adds a data processing device on the basis of the embodiment provided in Figure 3, the computer shown in the figure is specifically shown in Figure 4, also It can be other mobile terminals, such as PDA and so on. The current providing device, the voltage measuring device, and the circuit switching device are respectively connected to the data processing device. For example, the interface between the voltage measuring device and the data processing device is a general interface bus interface (GPIB interface); the interface between the current source and the data processing device is a general interface bus interface; the circuit The interface between the switching device and the data processing device is a serial port. As shown in Figure 5, the data processing device includes: a state control unit 501, which is used to control the on-off state of the voltage measurement device and the current supply device; a selection unit 502, which is used to select the working range of the voltage measurement device and the current supply device; data acquisition The unit 503 is used to obtain the data of the current supply device and the voltage measurement device; the data calculation and processing unit 504 is used to calculate the resistance value and resistance value of each resistance to be measured on the resistance box according to the obtained data error. The data processing device also includes a report issuing unit 505 (not shown in the figure), which is used to issue a verification report according to the resistance value and resistance value error of each resistance to be tested in the resistance box.

所述数据处理装置用于处理所述电流提供装置、所述电压测量装置的数据。上述所有接口只是本实施例所涉及的接口,并非用以限定本实用新型,在实际应用中,本领域的技术人员可以根据需要,选用适合的接口。The data processing device is used for processing the data of the current supply device and the voltage measurement device. All the above-mentioned interfaces are only the interfaces involved in this embodiment, and are not used to limit the utility model. In practical applications, those skilled in the art can select suitable interfaces according to needs.

如图6示,为电路切换装置连接在系统中的电路图。所述电路切换控制装置包括单片机,所述单片机用于控制选择标准电阻组中的某个电阻接入回路,并控制该电阻接入电压测量装置,之后所述单片机控制把被选择接入到电路中的电阻所对应的电阻箱上的被测电阻接入电压测量装置。As shown in FIG. 6 , it is a circuit diagram of the circuit switching device connected in the system. The circuit switching control device includes a single-chip microcomputer, and the single-chip microcomputer is used to control the selection of a certain resistance in the standard resistance group to connect to the circuit, and to control the resistance to connect to the voltage measuring device, and then the single-chip microcomputer controls the selected resistance to be connected to the circuit. Connect the measured resistance on the resistance box corresponding to the resistance in the voltage measurement device.

本实用新型实施例的有益效果在于,本实用新型提供的电阻箱自动校验系统解决了现有技术中频繁在标准电阻和被检电阻箱之间进行电路切换的问题,通过使用电阻箱自动校验系统,实现了电路自动切换,改善了工作条件,提高了工作效率。The beneficial effect of the embodiment of the utility model is that the resistance box automatic calibration system provided by the utility model solves the problem of frequent circuit switching between the standard resistance and the tested resistance box in the prior art. The test system realizes the automatic switching of the circuit, improves the working conditions and improves the work efficiency.

以上实施例,只是本实用新型优选的具体实施方式,而并非用以限制本实用新型,本领域的技术人员在本实用新型的技术方案内进行的通常变化和替换都应包含在本实用新型的保护范围之内。The above embodiment is only the preferred specific implementation of the utility model, and is not intended to limit the utility model. The usual changes and replacements carried out by those skilled in the art in the technical solution of the utility model should be included in the utility model. within the scope of protection.

Claims (7)

1.一种电阻箱自动校验系统,其特征在于,所述电阻箱自动校验系统包括:电压测量装置、电流提供装置、标准电阻组、电阻箱、电路切换控制装置;1. A resistance box automatic calibration system is characterized in that, the resistance box automatic calibration system comprises: a voltage measuring device, a current supply device, a standard resistance group, a resistance box, and a circuit switching control device; 其中,所述电路切换控制装置用于控制将所述标准电阻组中的一者接入回路,控制将电压测量装置连接到标准电阻组中选择接入回路的电阻和所述电阻箱上的被测电阻两者中的一者;Wherein, the circuit switching control device is used to control one of the standard resistance groups to be connected to the loop, and to control the connection of the voltage measurement device to the resistance selected to be connected to the loop in the standard resistance group and the resistor on the resistance box. One of the two measuring resistance; 所述电流提供装置与电路切换控制装置、标准电阻与电阻箱上的被测电阻串联后组成闭合回路;The current supply device, the circuit switching control device, the standard resistance and the measured resistance on the resistance box are connected in series to form a closed loop; 所述电压测量装置用于测量被接入到电路中的所述标准电阻两端的电压或所述电阻箱上的被测电阻的两端的电压。The voltage measuring device is used to measure the voltage across the standard resistor connected to the circuit or the voltage across the measured resistor on the resistance box. 2.如权利要求1所述的电阻箱自动校验系统,其特征在于,所述电路切换控制装置包括单片机,所述单片机用于控制选择标准电阻组中的某个电阻接入回路,并控制该电阻接入电压测量装置,之后所述单片机控制把被选择接入到电路中的电阻所对应的电阻箱上的被测电阻接入电压测量装置。2. The resistance box automatic calibration system as claimed in claim 1, wherein the circuit switching control device includes a single-chip microcomputer, and the single-chip microcomputer is used to control the selection of a certain resistance in the standard resistance group to access the loop, and control The resistance is connected to the voltage measuring device, and then the single-chip microcomputer controls the measured resistance on the resistance box corresponding to the resistance selected to be connected to the circuit to be connected to the voltage measuring device. 3.如权利要求1所述的电阻箱自动校验系统,其特征在于,所述电阻箱自动校验系统还包括数据处理装置,所述电流提供装置、所述电压测量装置、所述电路切换装置分别与所述数据处理装置相连。3. The resistance box automatic checking system as claimed in claim 1, is characterized in that, described resistance box automatic checking system also comprises data processing device, described current providing device, described voltage measuring device, described circuit switch The devices are respectively connected with the data processing devices. 4.如权利要求1所述的电阻箱自动校验系统,其特征在于,所述数据处理装置包括:4. resistance box automatic calibration system as claimed in claim 1, is characterized in that, described data processing device comprises: 状态控制单元,用于:控制电压测量装置和电流提供装置的开闭状态;The state control unit is used for: controlling the opening and closing states of the voltage measurement device and the current supply device; 选择单元,用于选择电压测量装置和电流提供装置的工作量程;A selection unit is used to select the working range of the voltage measurement device and the current supply device; 数据获取单元,用于获取所述电流提供装置、所述电压测量装置的数据;a data acquisition unit, configured to acquire data of the current supply device and the voltage measurement device; 数据计算及处理单元,用于根据获取的数据计算得出电阻箱的上各待测电阻的阻值、阻值误差。The data calculation and processing unit is used to calculate the resistance value and resistance value error of each resistance to be measured on the resistance box according to the acquired data. 5.如权利要求4所述的电阻箱自动校验系统,其特征在于,所述数据处理装置还包括:报告出具单元,用于根据电阻箱的上各待测电阻的阻值、阻值误差出具校验报告。5. resistance box automatic verification system as claimed in claim 4, it is characterized in that, described data processing device also comprises: report issuing unit, for according to the resistance value of each resistance to be measured on the resistance box, resistance value error Issue a verification report. 6.如权利要求1所述的电阻箱自动校验系统,其特征在于,6. resistance box automatic checking system as claimed in claim 1, is characterized in that, 所述电压测量装置与所述数据处理装置之间的接口包括通用接口总线接口;The interface between the voltage measuring device and the data processing device comprises a general interface bus interface; 所述电流源与所述数据处理装置之间的接口包括通用接口总线接口;The interface between the current source and the data processing device comprises a general interface bus interface; 所述电路切换装置分别与所述数据处理装置之间的接口包括串口。The interfaces between the circuit switching devices and the data processing devices respectively include serial ports. 7.如权利要求2所述的电阻箱自动校验系统,其特征在于,所述数据处理装置包括计算机、移动终端。7. The resistance box automatic calibration system according to claim 2, wherein said data processing device comprises a computer and a mobile terminal.
CN2009201731441U 2009-08-24 2009-08-24 Resistance box automatic calibration system Expired - Lifetime CN201477160U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102346243A (en) * 2011-09-22 2012-02-08 湖南省电力公司科学研究院 Intelligent resistance box for verification
CN102809739A (en) * 2012-08-23 2012-12-05 四川电力科学研究院 Method and device for checking storage battery internal resistance tester
CN104345179A (en) * 2013-07-30 2015-02-11 上海山特姆电气有限公司 Outdoor resistance box
CN105548660A (en) * 2016-01-29 2016-05-04 美的集团武汉制冷设备有限公司 Sampling resistance correction circuit, current detection circuit and driving circuit
CN105785303A (en) * 2016-04-19 2016-07-20 国家电网公司 Grounding ohmmeter calibrating device
CN108008193A (en) * 2017-11-29 2018-05-08 北京东方计量测试研究所 Combined type quantum Hall resistance sample ratio checker
CN108802481A (en) * 2018-06-20 2018-11-13 国网安徽省电力有限公司滁州供电公司 A kind of route survey device
CN111044961A (en) * 2018-10-15 2020-04-21 吴茂祥 Test machine self-checking system and test method
CN111693922A (en) * 2020-08-04 2020-09-22 云南电力技术有限责任公司 Automatic calibration system of impedance tester

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102346243A (en) * 2011-09-22 2012-02-08 湖南省电力公司科学研究院 Intelligent resistance box for verification
CN102346243B (en) * 2011-09-22 2014-01-22 湖南省电力公司科学研究院 Intelligent resistance box for verification
CN102809739A (en) * 2012-08-23 2012-12-05 四川电力科学研究院 Method and device for checking storage battery internal resistance tester
CN104345179A (en) * 2013-07-30 2015-02-11 上海山特姆电气有限公司 Outdoor resistance box
CN105548660A (en) * 2016-01-29 2016-05-04 美的集团武汉制冷设备有限公司 Sampling resistance correction circuit, current detection circuit and driving circuit
CN105785303A (en) * 2016-04-19 2016-07-20 国家电网公司 Grounding ohmmeter calibrating device
CN108008193A (en) * 2017-11-29 2018-05-08 北京东方计量测试研究所 Combined type quantum Hall resistance sample ratio checker
CN108008193B (en) * 2017-11-29 2020-02-07 北京东方计量测试研究所 Combined quantum Hall resistance sample proportion checker
CN108802481A (en) * 2018-06-20 2018-11-13 国网安徽省电力有限公司滁州供电公司 A kind of route survey device
CN108802481B (en) * 2018-06-20 2024-03-19 国网安徽省电力有限公司滁州供电公司 Line measuring device
CN111044961A (en) * 2018-10-15 2020-04-21 吴茂祥 Test machine self-checking system and test method
CN111693922A (en) * 2020-08-04 2020-09-22 云南电力技术有限责任公司 Automatic calibration system of impedance tester

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