Because of the low test current level used, a very sensitive voltmeter is required to measure the voltage drop, which is usually in the microvolt range.
由于所使用的测试电流很低，所以就需要非常灵敏的电压表来测量这种通常在微伏范围的电压降。
Select the lowest range of the voltmeter.
选择伏特计的最低量程。
When we measure the electric machines with little steady voltage adjusting rate, the absolute error of the voltmeter reaches out of the range of the steady state voltage adjusting.
在测量一些稳态电压调整率非常小的电机时，会出现测量用电压表的最大绝对误差大于稳态电压调整的范围。
When we measure the electric machines with little steady voltage adjusting rate, the absolute error of the voltmeter reaches out of the range of the steady state voltage adjusting.
在测量一些稳态电压调整率非常小的电机时，会出现测量用电压表的最大绝对误差大于稳态电压调整的范围。
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