voltage meter的用法和样例：
例句
- And the excitation voltage and output were also fed through the selector switch to the digital voltmeter.
其激励电压和输出也通过选择开关接到数字电压表上。 - 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。
