Simultaneous multi-channel stimulus-response measurements

[Tomlin]

I want to measure response of several devices to a common stimulus simultaneously using PXI 4461 and 4462 DSA boards.  The example SVXMPL_Baseband FRF (DAQmx AI and AO).vi processes response of only one input channel to the stimulus channel.  I want to process the response of multiple input channels to the stimulus channel simultaneously.  All help appreciated.

[Brian_P]

Hi Tomlin,

Thank you for using the forums.  The example that you are referring to will need a little modification to use multiple channels.  The DAQmx read is already set up to read data from multiple channels.  It is outputting a 1D Waveform of all channels 0 and 1.  Then inside the for loop, the Array is indexed taking the waveforms for channel 0 and channel 1 and they are compared.  If we had more channels to this, we can index the other channels out and use those to compare to 0 as well.  

Here is an example of what I am talking about.  This uses channels 1 and 2 as the inputs.

I hope that helps.

Regards,

Brian P.