Therefore, a voltmeter with high input resistance, such as an electrometer, is required. 所以需要使用具有高輸入電阻的電壓表，例如靜電計。
An electrometer makes an ideal coulombmeter because it has very low input offset current and high input resistance. 靜電計是一個理想的庫侖計，因為它具有非常低的輸入偏置電流和很高的輸入電阻。
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