Multible Channel Pretrigger

[Martin88]

Hi all,

I am working on a labview daq software with a NI 9220 device  i would like to set triggers with threshold on 8  channels, as soon as a voltage level reach the threshold it  should  trigger and give me pretrigger and post trigger samples. 

Otherwise i would calculate some values with the continuous data (RMS, MinMax) and write it to file.

i was looking at this example: 

https://forums.ni.com/t5/Example-Code/Archived-Analog-Level-Trigger-with-Pre-Trigger-Samples-in/ta-p...

This looks similar to my wishes, but it only has one physical channel, i was wondering if its possible to look at more than one channel, to get my requirements. 

thank you very much 

best 

[Timo.Schroeder]

Hey Martin,

Do you use a cDAQ or cRio chassy.

If you work with a cDAQ you can do this programmaticly in LabVIEW but you´ll have a much higher CPU utilization.

With a cRio u can work on FPGA level.

This would be the better solution performance like.

Possible is it with both options.

Cheers, Timo

[Martin88]

Hi Timo,

i will use a cDAQ and allready have one application where i can set the triggers on each channel, it works fine using a simulated signal, i will see if its really work as soon i get my NI hardware.

I will use a 1.8 dual core intel atom for processing the data, i dont need any graph just recording the data.