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。

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Select the lowest range of the voltmeter.

选择伏特计的最低量程。

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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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