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。
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.
在有些情况下，由于输入级过载，电压表的灵敏度可能会下降。
In some cases, the sensitivity of the meter may be reduced, because the input stages are overloaded.
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