How to rectify the distortion of the concentrator sampling signal?

Distortion in the concentrator sampling signal (waveform distortion, high-frequency glitches, baseline drift) is usually caused by interference coupling, poor grounding, or amplifier saturation. Rectification requires first identifying the cause. Observe the distorted waveform using an oscilloscope: If it is high-frequency glitches, check if the sampling line is close to a noise source; consider adding an RC filter (1kΩ + 100pF) or using shielded wire. If it is power frequency harmonic distortion, check the power supply filter; consider adding a PBZ1608E600Z0T ferrite bead and 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 is exceeded; it may be necessary to use an amplifier with a higher common-mode input range. On the PCB, ensure there is a continuous ground plane below the sampling traces. After rectification, the signal distortion should be less than 1%.