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多用电表的两个调零旋钮的原理有什么不同

2025-03-15 04:13:58

推荐回答（2个）

回答1：

一个是表针调零，即不作任何测试时调整表针的零位；另一个是测试电阻时，将表笔短接，调整表针至电阻刻度零位。前者是机械调零，后者是电位器调零。

回答2：

由于表头灵敏度的限制,由内部1.5v电池提供电源，那么超过200千欧的电阻流过的电流不足以使表针有明显的偏转，也就不能精确的测量。所以增加一个9v（早期的用15v电池）电池用于测量200k以上的电阻值，即x10k档。

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