Switching and measuring voltage sources with high internal impedance are subject to a number of errors, including offset currents, stray leakage paths, and electrostatic interference.
切换和测量具有高内阻的电压源会受各种误差的影响，包括偏移电流、寄生漏泄通路，以及静电干扰。
2
Shielding may also be applied to a conductor carrying a high level test voltage to prevent interference with nearby low level circuits.
承载高测试电压的导体也应该采用屏蔽，以防止与邻近的低电平电路发生干扰。
3
In the application of above 24V fort current voltage grade control circuit, Voltage Alternating and resonant wave interference of input model for Programmable Logic Controllers must be resolved.