Hello, In my application, we require to write ONLY 10 samples per second into a data file. But, the requirement is to have 16-bit resolution and obtain at the minimum 400 samples for 10 cycles of a sine wave which is 40 per wave. Max frequency is 50KHz, so sampling rate should be 2MHz. There is a minimum of 40us per sample for the lower end frequency of 25KHz, but can go to 20us per sample for the 50KHz wave. I have a PXI-5922 High Speed digitizer with only 8MB on board memory. How do I setup the LOOP RATE such I meet these requirements. I am kinda confused on what they loop rate does here. If we have a loop rate, should there also be a timeout? Or, would the sample rate determine LOOP RATE in which case we don't have to add a delay into the case that is fetching the data? I hope I have laid out my question clearly. I would specifically like to know how the 8MB is used when the vi is running and how to best determine the loop rate. Thanks! V

High-Speed Digitizers

Determining Sample Rate

Your welcome. Can you post your new code, because if you have to use niScope Read, you may be back to taking records again. What didn't work when you implemented it?

Systems Engineer
SISU

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Hi Nathan,

Yes my minimum record length and number of samples is 2000 again but it is bound to change because we are having a time varying drive frequency which leads me to believe we have to do some sort of spectral analysis to deal with harmonics as well. I have attached what I have done so far.

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