除了切换高压（>100 V）时需要高压开关卡外，通用开关通常足以切换电压源。
General-purpose switches are usually sufficient for switching the voltage source unless high voltages (>100V) are involved, in which case, high voltage switch cards are necessary.
提出一种自动量程切换电压测量系统的设计方法，该系统基于程控增益放大器器件，使用单片机控制其增益实现量程的自动切换。
It presents a system of voltage measurement with self-scale, based on the program control amplifier controlled by the single chip computer.
接触电势或热电效应偏移电压是设计用于低压切换的开关卡的关键技术指标。
The contact potential or thermoelectric offset voltage is the key specification of a switch card designed for low voltage switching.
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