输出触发可被连接到一个测量装置，例如伏特计。这样能够确保在开关触点完全稳定之后再进行测量。
The output trigger may be connected to a measuring device, such as a voltmeter. This will ensure the measurement is not made until the switch contacts have fully settled.
三刀开关最早用于切换伏特计保护及信号线路。
The three-pole switch was originally used to switch a voltmeter guard along with the signal lines.
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