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Pseudo tach for variable input speeds

I'm trying to use the pseudo tach feature when collecting data for an intermediate shaft in the gearbox using CSI2140. The motor constantly changes its speeds while running (ramps up, slows down and stop to make one cycle) controlled by a VFD. Will the pseudo tach feature work on this application? I put in the correct input/output ratio or tooth count but the detected running speed of the intermediate shaft in the software doesn't seem to be correct. Will the pseudo tach work on variable input speeds?

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