便携式双电桥校验仪的正确检定

The correct verification of the convenient taken double electric bridge test set

便携式双电桥校验仪由高精度低阻十进盘和标准电阻盘组成,是检定便携式双电桥及各种毫欧计、微欧计的标准仪器。检定它的关键是对非十进小电阻以优于3×10-5的不确定度进行测量,这在直流计量中难度较大。本文指出了常用的电阻箱检定方法的不适用性,给出了四种正确的检定方法。

The convenient taken double electric bridge test set is composed of high accu-racy decimal electric resistance and standard electric resistance panel.It is the standard instrument that verify the convenient taken double electric bridge and all kinds ofμΩinstrument.The indetermination degree is better tahn3×10 -5 and is more difficult to the nondecimal electric resistance.It is very difficult to the measment of direct courrent.This article describe that the common verification method is not applicable to the resistance box and bring up the correct4kinds of methods of verification.