Incorrect writing to the file timestamps

Hi all

I wanted to familiarize yourself with writing data and associated timestamps in a file to verify the rate at which samples are played back in my system. As a little test I wrote a simple VI that travels 5 times and creates 5 sine sampling points. Each point has its timestamp captured and converted to seconds and fractions of a second. After the for finishes in loop iteration it writes the data of sample (line by line) for every 5 samples with their associated timestamps.

I imposed a 1ms delay for each iteration and hoped to see the consistency between the timestamps of the consecutive samples but sometimes they are very or even identical to the previous timestamp which doesn't make any sense for me. I tried with wait times and it seems to be more precise between samples, but this result is intriguing.

Example:

31.209159       0

31.209159 84

31.209159 91

31.224784 14

31.224784 -76

I chose not to use custom file VI writing because I had the same problems and thought that it could have better results.

Hoping someone can clarify it or show me where I'm wrong. I have attached the VI below.

Thank you.

If you are using a hardware device timed, as NO hardware DAQ, you then get accurate timestamps. Everything else is a limitation of the Windows operating system. You can always switch to LabVIEW RT if you need more specific expectations.

Tags: NI Software

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