用0.5级,量程为XM=250V的电压表,测量X1=220V和X2=110V的电压,试问哪一次测量的准确度高?(计算说明)

用0.5级,量程为XM=250V的电压表,测量X1=220V和X2=110V的电压,试问哪一次测量的准确度高?(计算说明)


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有一只内阻为0.5MΩ、量程为250V的直流电压表,当它的读数为100V时, 流过电压表的电流是()mA。A、0.2B、0.5

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填空题用0.5级,量程为250V的电压表测量200V电压,则其最大相对误差为()。

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