The measured parameter itself is a pulsating signal, such as boiler drum water level, reciprocating compressor outlet pressure, etc., which are likely to cause oscillation. Such pulsating fluctuations will cause continuous changes in the output of the transmitter, which will cause the entire control system to oscillate without a stable state during the transition process. At this time, you can consider installing buffer components in the pressure guiding tube for mechanical filtering, or installing electrical dampers, adjusting and increasing the filter constant of the transmitter and receiving instrument, or closing the root valve to eliminate vibration.
