Running a loop without waiting on all readings

Hello,
I have been struggling to create a vi that does exactly what I want. I want to take multiple measurements from multiple sources at the same time with a time stamp. I have been getting all of the measurements accurately. My problem is that I need a very high sample rate for my data, and the instrument connected to my VISA serial read only samples at a rate of one measurement per 1.6 seconds. This is acceptable for this measurement, but my other measurements need to have hundreds of readings per second. However, it appears that my loop will only iterate once every 1.6 seconds, which I assume means that it is waiting for the next reading from my VISA device. Is there a way to tell Labview to check for a reading or obtain a new reading only when one is available, instead of holding all of the other readings to a 1.6 second sample rate?
The vi I am working with is attached. I originally used a WHILE loop but in an effort to speed up the iterations I switched to a TIMED loop. This did not help. I need all of the measurements to be sampled as fast as possible.
Thanks
Attachments:
ScratchVIc.vi ‏175 KB

Separate your code and use multiple loops. There is nothing wrong about using multiple loops. You want to avoid splitting your DAQ collection across multiple loops. But separating other types of processing is how you can improve performance. Have one loop do nothing but collect the data. This loop would post that data to a queue for further processing. You could also separate logging the data into it's own loop too. Again, data to be logged would be posted to a queue for processing. Writing data to a file in the same loop as you are collecting the data will decrease your performance. File access is slow.
Also, learn how to use data flow and avoid all of the stacked sequence structures. Most of the stuff in teh sequence structures already has data flow which will control the execution order. Deep stacked sequences are difficult to maintain and modify. You should also take some time to learn about state machines.
Mark Yedinak
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Wreck of the Edmund Fitzgerald - Gordon Lightfoot

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harishg92 wrote:
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ForLoop inside Event Structure.vi ‏11 KB

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