The operating principle and verifying method of the whole verifying DC resistance instruments with high accuracy by using DMM are analized emphatically and the calculation of the uncertainty is done.

• 介绍了几种整体检定直流电阻仪器的检定方法,着重分析了用数字多用表整体检定高准确度直流电阻仪器的工作原理和检定方法,并进行了不确定度的计算。