how do I get the Pretrigger data with the HW analog trigger

[DrObb]

I use startcondition type = cwaiHWAnalog but I need to set the pretrigger time. I set CWAI.GetStopCondition().SetPreTriggerScan = 200. When I acquired the data, I do not get the pretrigger data. What was wrong in the setup?

[Filipe A.]

Hello;

You didn't mention what version of NI-DAQ neither what DAQ board are being used on that application.

In case you are using the Lab-PC+ board, there is a known issue with the Pretrigger Trigger event. For more information on that perticular issue, type +lab-pc +pretrigger +componentworks at www.ni.com search field.

Regards
Filipe A.
Applications Engineer
National Instruments