前置器330180-091-05-J
物體的位移引起電位器端的電阻變化。阻值的變化量反映了位移的量值，阻值的還是減小則表明了位移的方向。通常在電位器上通以電源電壓，以把電阻變化轉(zhuǎn)換為電壓輸出。
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