描述
這種儀表只能用來(lái)測(cè)量直流(如附加變換器,磁電式儀表可以測(cè)量交流,如整流式儀表),如通入交流電流,則可動(dòng)部分由于慣性較大,將趕不上電流與轉(zhuǎn)矩的迅速交變而靜止不動(dòng)。也就是說(shuō),可動(dòng)部分的偏轉(zhuǎn)是決定于平均轉(zhuǎn)矩的,而不是決定于瞬時(shí)轉(zhuǎn)矩。在交流的情況下,這種儀表的轉(zhuǎn)矩的平均值為零
我們這里有您急需的停產(chǎn)備件,
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