The article mainly introduces the error analysis, calculation of uncertainty in measuring the error of indication of needle DC voltmeter by DVM.
主要介绍采用“数表法”检定指针式电压表示值的误差分析及测量的不确定度的计算。
2
DVM usually got an input impedance of 10 Mohm. There may be loading effect when measuring high impedance circuit.
数字式电压表通常有10兆欧的输入阻抗。当测量高阻抗电路时﹐可能会有影响。
3
After concentrated introduction of the conception of DVM, a simplified numerical model is proposed under high Renold number which is a DVM model combined singularity method.