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為什么萬用表測二極管正向電阻不同歐姆檔測出的阻值

發(fā)布日期:2022-10-11 點擊率:1074

    萬用表二極管正向電阻,不同的歐姆檔測出的阻值不同。

    因為二極管是一種非線性元件,從它的伏安特性曲線可以看出,加在二極管兩端的電壓與流過元件的電流并不成正比關(guān)系,即其伏安特性不是一條直線而是一條曲線。當用萬用表歐姆檔測量二極管正向電阻時,雖然歐姆檔的R×1到R×1k的內(nèi)電源電壓相同,但是選用不同檔位測量,其測量回路的內(nèi)阻不同,所以加在元件兩端的電壓也就不同,結(jié)果使被測元件反映出不同的阻值。

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