simultaneous sampling

[ASIM_BHATTI]

Hello every one

My main problem is that i want to sample 80 (single ended) channels simultaneously at a sampling rate of at least 4 Ksamples/s/channel. I have searched S serires DAQ which has dedicated ADCs for each channel but maximum no of channels on single DAQ card is not greater than 8 and its sampling rate(per channel)  is much more than my requirement. and if I use these cards i have to use 10 such cards and it will cause some problems like max no of PCI slots available on single PC etc.

Kindly can you suggest some optimized solution so that i can use minimum no of DAQs and at the same time simultaneous sampling requirement of 80 channels is also satisfied.

[devchander]

Hi,

If you are not particular about simultaneous sampling, You could take a look at the High-Speed M Series Multifunction DAQ cards ( each PCI 6522 card has 80 AI channels and should also meet your expected sampling rates)

see here

Other possibility would be to multiplex a suitable number of SCXI Analog input modules that have simultaneous sample and hold capability, to a single DAQ card. That way, you can have a larger channel count using a single DAQ card

Regards,

Dev

Message Edited by devchander on 01-08-2008 05:48 AM

Message Edited by devchander on 01-08-2008 05:54 AM

Message Edited by devchander on 01-08-2008 05:54 AM

[hoffiz]

Hi,

What are you measuring (temperature, force, sound, etc)? Since there is no S series with 80 channels your options are like the preview post said a high count m series. If you take a look at the NI PCI-6255, doing a multi channel acquisition you can get a 750 K samples per second divided by the number of channels so with 80 channels we are going to have approximately  9.2 K samples per second per channel.  Worst case scenario channel 80 is going to be read 1 can be calculated with this knowledge base: How is the Convert (Channel) Clock Rate Determined in NI-DAQmx and Traditional NI-DAQ?

I hope it helps