Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
Counting with cFP-CTR 502
3 views
Skip to first unread message
RZTC Dave
Aug 11, 2008, 3:40:13 PM8/11/08
to
I have a number of tasks where I count events and frequencies with the cFP-CTR 502. Turbine flowmeters and optical RPM sensors are the instruments I use most often. I am a new programmer learning on my own. I have been successful counting TTL pulses but would like to get a good period reading of the TTL. I have read and seen the sample code that uses the internal clocks for this.
In experimenting with the internal counters (32Khz and 1 Khz) I notice that I read both counters 4 - 6% lower than their stated frequency.
Is that typical error? Does anyone have any tips on achieveing this with a high degree of confidence? I have looked at the one sample FP period measure VI but have had little luck making that work for me. Any advice would be appreciated.
In experimenting with the internal counters (32Khz and 1 Khz) I notice that I read both counters 4 - 6% lower than their stated frequency.
Is that typical error? Does anyone have any tips on achieveing this with a high degree of confidence? I have looked at the one sample FP period measure VI but have had little luck making that work for me. Any advice would be appreciated.
0 new messages