Actual time recording (computer performance problem?)

I'm a beginner.
I'm recording the output file in every second, but the time of output file is different from the actual time.
I'm wondering if this is due to the computer performance (450MHz, 128MB) or if vi program can be implemented. I attached the file I use. The problem comes up when I use a vi with 50 channel outputs, but doesn't come up if I reduce the channels to around 20.
Thank you.
Attachments:
LODS_MFC2.vi ‏460 KB

It sounds like you are certainly running into timing issues. I see that in your VI, you use AI Sample Channel to acquire data from a single channel everytime the loop iterates. This is not the best means to go about doing such. The reason being that each time the VI is called, it has to setup the operation, then perform the read, and then clear the operation. What you should be doing is setting up the operationg outside the loop, perform only reads in the while loop, and then clear the task after you are complete. LabVIEW gets shipped with several examples that behave just this way, you should look in the example finder for these.
Additionallly, if you read the help on AI Sample Channel.vi, it states it does a single, untimed measurement of a channel. Since
you posted with the title "actual time recording", I feel that timing might be of importance to you.
You never did mention what version of LabVIEW you have, or the hardware and drivers you are using, so I am leaving this post rather general. If you have some more questions after reading through this post and looking through some of the examples, post back to this discussion with more information, and I will try and help you out further.
Sincerely,
Jared A.

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