Frequency measurement keep reading value when stop rotation

Hi,
i am doing the program in the attachment
in this program i am using ni9401 and cDAQ 9188 to measure frequency from motor driver
but i am facing some problems
1. the reading sometimes different than osciliscpe.
2. when i stop the motor the program still read values and not going to zero |
Note my driver send the feed back as a signal"Pulses" with difference frequencies depend on my speed . i send digital values to the driver pins 111 to make it rotrate forward and 100 to make it stop rotating + analog value to change the speed
can i have help in that ?
thanks
Attachments:
speed calibration.vi ‏161 KB

As I understand this you are trying to read the frequency of an quad encoder and the reading is fine as long as the quad encoder is at a steady speed but when it is changing speed you are getting random frequency values. I looked at your code and nothing seemed to jump out at me as being wrong with it but I do have a couple suggestions to see if we can narrow down where the issue may lie.
If you could just try running on of the examples found in the example finder (Help»Find Examples...) specifically example Hardware Input and Output»DAQmx»Counter Measurements»Digital Frequency»Meas Dig Frequency-Buffered-Cont-High Freq 2 Ctr.vi. And just wire the output to a waveform chart or a dial and see if you are seeing the same results there. If that is giving expected results i would just implement your formula node and averaging into that example and save it as your code. I have attached an image of such an implementation.
Doug Farrell
Product Manager - Condition Monitoring
National Instruments
National Instruments Condition Monitoring
Attachments:
example code.png ‏44 KB

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