voltage instrument的用法和樣例：
例句
- And the excitation voltage and output were also fed through the selector switch to the digital voltmeter.
其激勵電壓和輸出也通過選擇開關接到數字電壓表上。 - If using a separate current source and voltmeter to make low resistance measurements, each instrument must be checked for non-ohmic contacts.
如果使用分離的電流源和電壓表來進行低電阻測量，則必須檢查每台儀器的非歐姆接觸情況。
