Hello I wanted to ask how the maximum sample rate for the T7 scales with the input resolution index? The support page says up to 100ksamples/sec with a resolution index of 0 or 1. That is max. sample rate for stream mode is 100ksamples/second (SampleRate = ScanRate * NumAddresses). What if I have a different resolution index of say 8? Does this effect the maximum sample rate for stream mode?
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Maximum sample rates decrease as resolution index increases. Table A.1.7 has information about the maximum sampling rates at different settings:
https://labjack.com/support/datasheets/t-series/appendix-a-1#t7-stream-r...
Hello,
Thank you for the reply. Could you clarify what the last column in Table A1.7 means in that link. since it specifies the scan rate for >1channel that is constant? Also is NumAddresses the number of AIN being used in stream mode ?
Also what happens when using say 3/6 channels? Since the forumla ScanRate = SampleRate / NumAddresses seems to be valid only for the first row in table A 1.7
We removed the "Max sample rate >1 channel" column because it was not very useful.
NumAddresses is the number of AIN being measured while streaming.
For unlisted "# channels" maximum rates we recommend interpolating from available data. For example, a more conservative estimate for the 3 channel maximum can be approximated from the 4 channel maximum. If looking at resolution index 2 and ±10V range, the 4 channel maximum is 9kHz. That is about 9*4 = 36kHz sample rate. 36kHz/3 = 12kHz maximum scan rate if using 3 channels. An optimistic estimate would be generated using the 2 channel value (19.8kHz) giving you an estimate of 13.2kHz. The actual maximum for 3 channels is probably in the middle of the two estimates at around 12.6kHz.