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Simultaneous sampling with a PCI-MIO-16XE-10 board.

Hello,
I work with LabView and a PCI-MIO-16XE-10 board.
When I sample 2 channels, it's sampling channel 1 and after channel 2. like this:1 2 1 2 1 2 ..
I want to sample the both channel on the same time, like (1-2) (1-2)...
How can I do?
Thanks for any answer
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Message 1 of 6
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You buy two boards 🙂

I'm not familiar with that particular card, but generally they have a single
digital to analogue converter and measure multiple channels with it by
connecting it to each in turn. This is done very quickly and usually the
time between channels is much less than the time between readings or the
times over which the measured parameters vary and it's convenient to think
of all the readings in each scan as being instantaneous even though they're
not. If the switching time is significant to the application, then you need
multiple A-D converters all triggered simultaneously.

Check in the manual to see what the switching time is. What are you
measuring that it's such a problem?

tao wrote in message
news:506500000008000000D4160000-984
280909000@quiq.com...
> Hello,
> I work with LabView and a PCI-MIO-16XE-10 board.
> When I sample 2 channels, it's sampling channel 1 and after channel 2.
> like this:1 2 1 2 1 2 ..
> I want to sample the both channel on the same time, like (1-2)
> (1-2)...
> How can I do?
> Thanks for any answer
Message 2 of 6
(3,022 Views)
Thanks,
I work on a program to calibrate sensors of acceleration. I need to sample at 50 kS/s.
Tao
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Message 5 of 6
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A previous poster commented that the "10" at the end of the model number
means it takes 10 microseconds for the switches to settle. So ignoring the
acquisition time the switcher can do 50kS/s and you have significant
"stagger" in the readings across the two channels.

It's likely that you can't neglect the acquisition time, though, and since
the switcher can only just keep up with your 50kS/s sample rate without the
pauses for the measurement I suspect you need new/more hardware. Pushing the
card beyond spec, even if the DAQ software will allow it, will result in
inaccurate measurements.

tao wrote in message
news:506500000005000000581C0000-984280909000@quiq.com...
> Thanks,
> I work on a program to calibrate sensors of acceleration. I n
eed to
> sample at 50 kS/s.
> Tao
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Message 6 of 6
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Look into the SC-2040. This worked for me with the PXI-6070E. Their is
also a SCXI version of this board.

Dan.

"tao" wrote in message
news:506500000008000000D4160000-984280909000@quiq.com...
> Hello,
> I work with LabView and a PCI-MIO-16XE-10 board.
> When I sample 2 channels, it's sampling channel 1 and after channel 2.
> like this:1 2 1 2 1 2 ..
> I want to sample the both channel on the same time, like (1-2)
> (1-2)...
> How can I do?
> Thanks for any answer
0 Kudos
Message 3 of 6
(3,022 Views)
The -10 in the board name refers to the settling time (in microseconds) of the analogue multiplexor in the board, so the closest to "simultaneous" that the board can sample is 10 microseconds. The SC-2040 Sample-and-hold module will help, or you could change over to a true simultaneously sampling board (see the "DSA" boards made by National Instruments). Another good option is to use a second board, synchronized over the RTSI bus to achieve true simultaneous sampling.
Message 4 of 6
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