Because the measurement and control signal is often a weak DC or slow-changing radiation interference from space, the influence of the intelligent electric actuator's measurement and control system mainly depends on two paths: one is direct radiation to the computer, and the circuit is induced to cause interference; The radiation to computer peripherals and communication networks is induced by the induction of peripheral devices and communication lines.

There are two main ways to transmit interference: one is through the power supply of the sensor power supply or the common signal instrument, that is, the power supply that the distributor is connected to; the second is that the signal line is interfered by the space electromagnetic radiation, and the component is damaged in severe cases. , logic errors and large system failures.

The interference from the grounding system is mainly caused by the grounding system chaos: the noise coupling interference caused by the shielded grounding wire of the measurement and control system and the grounding wire of the casing, the signal grounding wire, the power grounding wire, and the AC power grounding wire.

From the above, we can summarize the interference current (voltage) generated by various interference sources (noise sources) on the measuring device and the detection system. It needs to have three elements at the same time: (1) noise source; (2) noise-sensitive receiving circuit; (3) The transmission path from the noise source to the receiving circuit.