100 A直流大电流标准及检定系统

100 A DC high current standard and verification system

介绍了一种新建立的直流大电流标准及检定系统。该系统由直流标准电压源、跨导放大器、零磁通电流互感器、分流器、标准电阻和数字电压表组成 ;直流电流输出范围为 0～10 0A ,不确定度为 5× 10 - 4,直流电流测量范围为 0～ 12 0A ,不确定度为 5× 10 - 5。分析了常用的直流大电流测量方法 ,介绍了系统的硬件设备组成 ,简述了关键设备的基本原理和校准测试方法 ,并给出了测试结果 ,该标准的建立将满足 10 0A以下直流大电流源、直流大电流表。

The paper presents a DC high current standard and verification system built up newly.This system consists of DC standard voltage source,zero magnetic flow current mutual inductor ,transconductance amplifier,current divider,standard resistance and digital voltmeter.DC current output range is on 100A.Uncertainty is 5×10 -4 ,DC current measurement range is 0～120A.Uncertainty is 5×10 -5 .The usual measurement method of the DC high current is analysed.Hardware equipment constitution of the system is presented.Base principle of rey equipments and calibration test method are prescribed simply,and testing results are given.