How can I configure my counter inputs for rpm measurements?

[Mishal]

Hi All,

I am trying to configure my NI PCI 6221 card for counter inputs. What I am trying to do is I am having a proxy switch which gives me a logic 5V on each pulse. I had connected that 5V to my counter source. I am getting the counting my selecting edge counts in the Measurement & automation explorer. Now I am trying to configure that counter input in my Labview for a RPM measurement of motor. Can somebody help me regarding this.........

Waiting for a valuable suggestion from your side...........

[Otis]

Hi Mishal,

If you are trying to measure the RPM of the motor, then you will simply need to count the number of counts and then do some sort of scaling.  For example if you have 10 pulses per revolution, you read every 100 milliseconds, and your count increased from 138 to 352 then that means:

((352-138 Pulses) / 10 Pulses/Rev) / (0.1 s / 60 s/min) = 12840 RPM

Just read your counts, compare it to your last value and do a little math to get you to your goal.

Regards,