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AC電流探頭頭部實際上是一個線圈，這個線圈纏在磁芯上。當這個探頭頭部保持在方向及接近承載AC電流的導線時，探頭會輸出一個線性電壓，這一電壓與導線中電壓的比例是已知的。這種與電流有關的電壓可以在示波器上顯示為電流刻度的波形

　　AC電流探頭的帶寬取決于探頭線圈的設計和其它因素。帶寬可以高達1GHz。但是，比較典型的帶寬低于100MHz。