frequency measurement FP-CTR502

[New Guy]

I am trying to measure the frequency of a pulse signal coming into my FP-CTR502.  I know I can conncect it to a gate, and then using a reference 32k or 1k signal on another channel, determine reference counts/time.  But I am limited on inputs and would like to see if there is a way I can directly read it on one channel.  The only way I have been able to do this is read the counter, and then shorlty there after read the counter again and counts/time again, but I would like more accuracy especially with a slow freq (800RPM with a 1-2s sample rate).   From what I understand, Diadem offers a module that reads it directly from the input.  Is there something similar in Labview?

thanks,

C

[Hal_L]

Hi C,

There are three methods that you can use to measure the frequency with the FieldPoint Counter modules. This knowledgebase thoroughly describes the first two methods and has some helpful links: How Can I Measure Frequency With the FP-CTR-500/502?

The third method is to simply use a single counter to find the number of pulses over a period of time. If you need higher accuracy than this method, then I recommend using one of the two methods described in the knowledgebase.

Regards,
Hal L.

[New Guy]

Thanks Hal,

I looked at that link and it involves using the gate also.  I am trying to avoid that, and I was hoping there was more functionality to the CTR that I didn't know about.  There was a Diadem block that I thought read the frequency directly but it was really a script just performing the same type of counts/time calculations.  I think I have it figured out so that I can just use the one input and then I will average my results, it will be a little slow to quick changes but should give me a bit more stable data.

thanks again

C