05-17-2021 06:17 AM - edited 05-17-2021 06:19 AM
we're using both cards in different systems. My question is if there is any limitation to the maximum number of
samples to be recorded at maximum sample rate. In other words, will there be a maximum recording time at a given sample rate. In classic oscilloscopes this is limited due to the internal memory. For the fast connected PXIe cards only the host system's memory should be the limit, I suspect. So it should be possible to record several minutes at maximum sampling rate. Am I right with that?
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05-17-2021 07:43 AM
It's even better than that. If you stream to disk, then it's your hard drive capacity that becomes the limit rather than system RAM. Using DAQmx's TDMS logging feature is a particularly efficient way to stream to disk.
(There are some caveats for particularly high-speed acquisition devices. Or for slow drives, but those kinda don't exist anymore. If you manage to hit a limit, a little bit of extra work will give you another factor of 4 to work with -- you can save raw 16-bit integer A/D counts along with the calibration scaling instead of saving the default 64-bit double-precision floating point.)
(Summary of my reasons in this post, part of a voluminous thread of mostly complaints starting here).
05-17-2021 07:52 AM
thank you very much. That was the information I needed!