JJG 837-2003 直流低电阻表

中华人民共和国国家计量检定规程

JJG837-2003

直流低电阻表

D.C.lowResistanceMeters

2003一09一23发布2004一03一23实施

国家质量监督检验检疫总局发布

JJG837-2003

直流低电阻表检定规程

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lowResistanceMeters

本检定规程经国家质量监督检验检疫总局于2003年09月23日批准，

并自2004年03月·23日起施行。

归口单位:全国电磁计量技术委员会

主要起草单位:河南省计量测试研究所

参加起草单位:江苏省计量测试技术研究所

中国计量科学研究院

本规程委托全国电磁计量技术委员会负责解释

JJG837-2003

本规程主要起草人:

杨明镜(河南省计量测试研究所)

王卓(河南省计量测试研究所)

参加起草人:

赵军(河南省计量测试研究所)

刘文芳(河南省计量测试研究所)

樊义(江苏省计量测试技术研究所)

吴昊(中国计量科学研究院)

JJG837-2003

目录

1范围··························································································……(1)

2引用文献····················································································……(1)

3概述··························································································……(1)

4计量性能要求·(1)

4.1基值误差·················································································……(1)

4.2准确度等级····································································。·········……(2)

4.3升降变差·················································································……(2)

5通用技术要求··············································································……(2)

5.1外观及通电检查········································································……(2)

5.2面板及铭牌····················································，···········。·············……(2)

5.3绝缘电阻·················································································……(2)

5.4工频耐压试验···········································································……(3)

6计量器具控制············································································…·…(3)

6.1检定条件·················································································……(3)

6.2检定项目·················································································……(4)

6.3检定方法··················································································一·(4)

6.4检定结果的处理········································································……(6)

6.5检定周期·················································································……(6)

附录A直流低电阻表原理图····························································……(7)

附录B数字式低电阻表检定原始记录背面格式····································……(8)

附录C模拟指示式低电阻表检定原始记录背面格式······························……(9)

附录D直流低电阻表检定证书(内页)格式·······································……(10)

附录E直流低电阻表检定结果通知书(内页)格式·····························……(13)

JJG837-2003

直流低电阻表检定规程

1范围

本规程适用于0.05级一5级的直流模拟指示式和数字式具有毫欧、微欧或更低量程

的直流低值电阻测量仪表(以下简称低电阻表)的首次检定、后续检定和使用中的检

验。

本规程不适用于交流低电阻表的检定。

2引用文献

本规程引用下列文献:

JJF1059-1999测《量不确定度评定与表示》

GB4793.1-1995测《量、控制和实验室用电气设备的安全要求》

GB/T13978-1992数《字多用表通用技术条件》

使用本规程时，应注意使用上述引用文献的现行有效版本。

3概述

低电阻表是具有毫欧、微欧或更低量程的低值电阻测量仪表，可测量线圈的电阻、

导线电阻、接触电阻、焊接电阻及铆接电阻等。仪器一般采用四端连接方法，以消除接

触电阻和引线电阻的影响。

常用的低电阻表的基本原理是使恒定的直流电流通过被测电阻，然后测出此电阻两

端的压降，再折算成电阻数值并直接从表头上反映出来。

常用的低电阻表由恒流源、电压采样处理单元及指示(显示)等部分组成的，其原

理框图见附录A，还有采用其它原理的低电阻表，如快速二次采样比较法的大电流低电

阻表和电压比的低电阻表等。

4计f性能要求

4基值误差

4模拟指示式低电阻表的基值误差表示形式

Rx一R

E=x100%(1)

式中:E—基值误差;

RT—被检表的读数值(电阻示值);

Ro—被检表电阻示值的实测值。

4.1.2数字式低电阻表的基值误差

4.1.2.1绝对误差表示形式

△=土(a%Rx+6