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.
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