trigger Ni scope

[ArcNatraj]

I am trying to capture large number of waveform from Ni scope using VC++ .NET. When i trigger the acquisition using the normal mode the acquisition starts immediately. However i want to acqusition to start only after a few millisecs or when there is some activity on the IO line. Requets some suggestions on how this can be done?

[TheWoost]

Hi Arc,

It sounds like you currently have your application configured for immediate triggering.  In this mode the acquisition begins immediately after being configured by the driver software.  There are a few options that I think may work in your application:
1.  Edge Triggering - occurs when a signal crosses a trigger threshold that you specify. You can specify the slope as either positive (on the rising edge) or negative (on the falling edge) to the trigger.

2.  Digital Triggering - occurs on either a rising edge or falling edge of an external digital signal.

3.  Triggering with Trigger Delay - the amount of time that elapses between when a trigger occurs and when the digitizer actually triggers.

Refer to the High-Speed Digitizer help here for more information about the trigger options available.

Regards,
Andrew W
National Instruments

Message Edited by TheWoost on 03-16-2007 11:19 AM