GE輸入輸出模塊IC693MDL646
一般測量阻值小的阻值為主繞組，第二大的阻值為副繞組，大的阻值為主、副繞組串聯電阻。
單相電機接線為測量大的阻值線頭與電容並聯，測量小的阻值線頭接入單相電壓。
當測量單相電機阻值為1大2小，當兩個小的測量阻值一樣時，說明主、副繞組阻值一樣，當給主繞組通電時電機為正轉，當給副繞組通電時電機為反轉。當主、副繞組阻值一樣時，說明單相電機有正反轉的功能，可以用於正反轉。
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