How to rectify the distortion of the sampling signal from the PMS (Power Measurement System) of the electrical force measurement switch?

Distortion in PMS sampling signals (such as waveform distortion, superimposed high-frequency glitches, baseline drift) is usually caused by conducted interference coupling, poor grounding, or amplifier saturation. Rectification requires first identifying the cause of the distortion. Observe the distorted waveform using an oscilloscope: If it is a high-frequency glitch, check if the sampling line is close to a switching node or clock line; consider adding an RC filter (e.g., 1kΩ + 100pF) or using shielded wire. If it is power frequency harmonic distortion, check if the power supply filtering is sufficient; consider adding a PBZ1608E600Z0T ferrite bead and a larger capacity capacitor to the sampling power supply. If it is baseline drift, focus on checking ground loops; try changing the sensor shielding layer to single-point grounding, or adding a common-mode inductor CMZ2012A-900T between the signal ground and the chassis ground. If the amplifier output is saturated, check if the common-mode voltage exceeds the limit; it may be necessary to use an amplifier with a higher common-mode input range or add an attenuation network. On the PCB, ensure there is a continuous ground plane below the sampling traces. After rectification, a retest should be conducted to ensure that the signal distortion is less than 1% within the full-scale range and that the system passes the relevant immunity test.