DAQmx - Read Multpile Channels, Different Delay for each channel

[Dide_]

I want to have my input channels triggered at once, but each of them would have a different delay between triggering and starting acquirng samples. How can I do it?

I know how to differ input voltage levels for each channel or anything set within "Create Channel", but I have no idea how to use Trigger Node for each channel separately.

Any clues?

[JÞB]

you don't,  you get 1 acquisition per trigger.  period.  you can toss out a lot of data you are not interested in though. 

[ValkoA]

Dear Dide,

Could you explain a little bit about what you are trying to accomplish by this architecture? What is the goal of the application? 

Also, please tell us what is the device (are the devices) you are using for the project. Triggering and other settings can greatly differ depending on the device.

Kind regards:

Andrew Valko

NI Hungary

[Dide_]

It is USB 6361. I want to generate signal for 1 channel and acquire signals from 8 channels. For each reading channel there should be possibility to set a time delay between start of generation and start of reading samples. Time of reading is about 1 s and delay vary from 0 - 50 ms.

[ValkoA]

Dear Dide,

In that case, I believe you can create artificial delays in the measurement by subtracting samples from it. For example, if you start the measurement at a 1kHz sample rate, you can create an artificial delay by throwing away the first 20 samples acquired from the channel in question. Also, since your device is not simultaneously sampled, make sure you calculate for delays between multiplexed channels. You'll find more information on multiplexing here.

Kind regards:

Andrew Valko

NIH