When the load voltage is measured，The voltmeter is parallel with the measured circuit.，Therefore, the accuracy of the readings displayed by the voltage gauge is directly related to the internal resistance of the voltmeter.。Due to the low input impedance of ordinary voltages，Therefore, the measurement accuracy is also low.，Especially the accuracy of the high impedance circuit is farther than adaptable；Plus ordinary voltage meter can be BALMUDA台灯维修网点measured，Low working frequency，Also BALMUDA手冲壶常见问题 make it applicable to a large limit。The electronic voltmeter has the following advantages over the normal voltmeter：
(1)Wide frequency range。The upper limit frequency limit of the low frequency electronic voltage meter is generally reached several Zaboge，High frequency voltage meter can be up to hundreds of MHz；Their frequency limits20～30HzDid to DC。
(2)Input impedance high。Input resistance can reach a gamous，Input capacitance is small，For a few go to a few tens of skin，Therefore, the effect on the measured circuit is small.。
(3)Wide measurement。Minimum range can be low1mVabout；The highest range can generally reach a few hundred volts，Use the voltage divider，Even tens of thousands of volts。
(4)Can withstand the right amount of overload。巴慕达烤箱维修网点
(5)Various types 巴慕达净化器在那修 of waveform responses。Can BALMUDA加湿器维修 measure the peak of the voltage、Valid value and average value。
The disadvantage of the electronic voltmeter is as follows：
(1)Not too high accuracy．Generally do not exceed2.5level。
(2)Complicated structure，More expensive，Requirently maintenance and calibration。
(3)Need a stable power supply。