What is the THD (Total Harmonic Distortion) for the 140ACI03000 module?

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We only specify THD for discrete AC input modules. The 140ACI03000 is strictly 1-5VDC or 4-20mA.

This card has no additional filtering capability outside of the built in low pass filter (-3db cutoff @ 15Hz, +-20%).

If the signal is simply too noisy and can not be cleaned up before it gets to the module, you can try creating some sampling or averaging logic.