Mise put buffer, triggered analog capture

Hello

I hope someone can help me with the please my problem.  I will try and describe the situation.

-J' have a pulse train of a motor encoder attached to the counter 0 my USB daq card 6211.  This is implemented to calculate the periods of pulsation.  In the loop of my reading, I read 10 samples at a time.  It works very well.

-I also read say 4 analog samples on each rising edge of this encoder pulse train. I implemented a sample samples finished with a clock a fast sample time. I've set up the trigger to be out PFI0 and I'm tired of the pulse train in as well as the PIN.

-In the loop, I then read 4 samples per iteration.

-When I turn the engine slowly by hand tree, I confirm that everything works as it should - I get 10 calculations period every 10 edges and I get 4 analog values every single edge.

Now for the problem.

No motor speed based on the time it takes for me to iterate in my loop 5 (for example) edges rising occurred.  It's no problem for the account of the period - they are be stamped in any case.  But, I only receive the last analog readings 4 - I will have missed 4 sets of data.

What I need to be able to do is to read a 2D table (for example) 4 sets of 4 points given.  I can not understand how to do this well...

Please can someone help?

Thanks a lot for any assistance.

Martin

The version of LabVIEW you shouldn't question regarding DAQmx properties.  On the node property DAQmx Timing, it should be "more > I convert > rate."  The time interval between samples 4 is now governed by this property, AIConv.Rate.  The rates on the DAQmx Timing.vi property really means nothing since you are using the external sample clock (PFI0 of your encoder).  If you read several samples at the same time as a waveform, it would alter the time between samples according to this rate, but its really a best estimate because we cannot be certain that you actually provide.  In VI that I posted, we only read 1 sample at a time anyway, so it really means nothing.

I hope that you can get the attribute AIConv.Rate of work, and if so, it seems like it should work for you!

Tags: NI Hardware

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