数字式电压表通常有10兆欧的输入阻抗。当测量高阻抗电路时﹐可能会有影响。
DVM usually got an input impedance of 10 Mohm. There may be loading effect when measuring high impedance circuit.
本装置采用专用芯片，实现多种电压等级全范围等精度测量，同时输入阻抗高，不影响原车的绝缘状况；
It use special chip to realize full-range and equal observations for different voltage rate, without additional insulation faults for high input impedance .
研究进一步提高测量系统灵敏度的方法，设计高输入阻抗的电压跟随电路。
The methods for increasing the sensitivity of the measurement system were studied and the voltage follower based on operational amplifier was designed.
研究进一步提高测量系统灵敏度的方法，设计高输入阻抗的电压跟随电路。
The methods for increasing the sensitivity of the measurement system were studied and the voltage follower based on operational amplifier was designed.
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