Getting Error -1074118632 occurred at niScope Multi Fetch WDT.vi

[roger8144]

Hi,

I was trying to use PXIe-5122 digitizer to simultaneously acquiring data from two analogue input channels at 20 MS/s sampling rate (my signal is at 2MHz). I use Express NI SCOPE VI to setup the continuous acquisition, with read length set to 50000. But, I keep getting the following error:

Error -1074118632 occurred at niScope Multi Fetch WDT.vi

Possible reason(s):
The requested data has been overwritten in memory so it is no longer available for fetching.
 

When I reduced the sampling rate to 2 MS/s, this error never comes back. But, I do need a high sampling rate and small read length per cycle in order to do a real time signal processing. Is there anything you suggest to do in order to solve this issue?

Thanks,

-Roger

[Dennis_Knutson]

There is a dedicated board for digitizers at http://forums.ni.com/t5/High-Speed-Digitizers/bd-p/150 that would be more appropriate for your question.

The first thing I would suggest is to use the lower level functions and avoid some of the overhead of an Express VI. You haven't shown your code but the processing may have to be moved to a consumer loop.