Setup:
I am acquiring Data from NI PXIe-1078 chassis, with 5 NI PXIe-6368 cards and 1 NI PXI-6683 timing module. In the “Acquire Data” while loop, an “analog 1D Wfm NChan NSamp” waveform and an IRIG timestamp is acquired (for each card). Then they are bundled, passed to the “Log Data” while loop through a queue, unbundled, and finally, the t0 for the waveform is overwritten with the IRIG timestamp. The waveform is then converted to x-y pairs. The waveform, x, and y data are all logged in different groups in a TDMS file.
(Ignore the Slave Cards for now)
Issue #1:
When the x (IRIG Time) data is viewed in DIAdem, the graph is not completely linear. There are jumps to ahead or behind of time.
X channel from HSCard5/ai0 is shown in Pic 1.
The graph (pic2) compares the waveform (red) and the x-y pairs (blue) of HSCard5/ai0.
As you can see the waves are synched until .01 seconds which coincides with the “samples per loop” parameter. There appears to be some type of delay, glitch or what have you between each frame for the x-y pair graph (blue). However, the waveform (red) does not have the same issue even though it has the same t0s.
Why is there time jumps in the x(IRIG time) channel?
Why is it that the waveform (red) has the correct graph shape of the square wave but not the x-y pairs (blue) graph? Can the waveform correct the t0 timestamp discrepancies automatically?
