counter returns garbage values

[Gaussy]

I am using cDAQ 9184 and 9401 Digital I/O card,I am using the counters available for frequency measurement(pulses are generated by a hall sensor,whose frequency i want to measure to estimate DC motor speed.But the problem is that counter returns garbage values.I have tested the card and its counters they are working fine.What could be the possible causes of this happening?

attaching a VI snapshot.
Please hep me out at the earliest. 🙂

Thanks and regards.

[John_P1 · Accepted solution]

Are these garbage values much higher frequency than you would expect?  If so you're probably picking up noise and should enable the PFI filter for your task.

Best Regards,

[Gaussy]

Thanks John! Enabling the filter solved my problem.