How to set different sampling rate for DSA DAQ?

[MVK]

Friends,

We all know well about features of DSA Data acquisition cards. It is individual ADC for each channel. When each channel has individual ADC, can we able to set Different Sampling rate to each channel? If the answer will be yes, please tell me how to set different sampling rate for DSA card using NI DAQmx functions.

[Jennifer O]

Hello MVK,

DSA boards do have a dedicated ADC for each channel.  This enables you to simultaneously sample each of of your channels (in contrast to a multiplexed board which will have a finite delay between samples). 

This does not however mean that you can simultaneously run two hardware timed tasks.  There is a single shared  AI Sample Clock for the input channels.  To sample multiple channels at different rates, you can sample all of the channels at the fastest rate and then resample or ignore samples in software to achieve your desired slower sample rates.  If you work with LabVIEW you will see a resample waveform function for this purpose.

I hope this helps.

Jennifer O.