Data Acquisition Issue

[ANON12345]

Hello,

I have created a program that logs vacuum and temperature of a product.  I want to continuously display the live data on a graph but I noticed that when the program is running, there are breaks in the vacuum waveform (blue line).  It is as if data is not being logged or read periodically.  I tried playing with the sample rate but nothing helped. Any advice is appreciated.  Thanks!

[aeastet]

Do you see any errors?

I have had issues in the past sampling too slow. This may be causing part of the problem. I would also suggest that you offload the processing and saving of the data to the bottom loop. Have the data stream to a control them process it somewhere other than the loop you are using to do the data acquisition. You may have to over sample a bit and then average to get the card to give consistent data flow.

How do you have the channel connect to the 9201?

[crossrulz · Accepted solution]

1.  Since all of your modules seem to be on the same chassis, you should be able to just create 1 task for all of your channels.  This will make your code quite a bit simpler.

2. Use a Producer/Consumer setup to move your logging to another loop.  This will allow your DAQ loop to keep a good, steady pace while you just log the data when it comes in.

[ANON12345]

I used 1 task for all my channels and it fixed the problem.. Thanks,