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 | | From: | cwierzynski | | Subject: | Number of samples read is not equal to number of AI Sample Clock pulses - why? | | Date: | Fri, 21 Jan 2005 17:41:04 -0600 (CST) |
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 | Dear Community,
I am using several PXI-4472s for acquisition and at =
the same time I am routing the AI Sample Clock signal to a PXI-6608 counter=
/timer card so that I can time stamp each sample.
Unfortunately I a=
m finding that I always get more AI Sample Clock pulses than samples, so I =
don't know which time stamp corresponds to which sample. Why is that?
r>For acquisition I am using something very much like the following DAQmx S=
ync and Stream example:
display.DISPLAY_EPD4?p_guid=3DD5C11EA57D0E635FE034080020E74861&p_node=3DDZ5=
2260" target=3D_blank>Sync and Stream.vi
After stopping the task=
s, I use DAQmx Read vi again to read whatever samples might be left in the =
buffer, but that request always comes back empty. I can't figure out if the=
re are AI Sample Clock pulses at the beginning of the task that don't actua=
lly acquire any data, or if I have data left over in the buffer after I sto=
p the task that I am not reading properly.
Any help would be greatly=
appreciated!
Cas
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