triggered AO with Delay

[irish colm]

Hi,

I want to trigger a delayed analog output. I am using the DAQmx trigger property node to start the AO after a certain amount of time. Can anyone tell me, what is the shortest delay that can be used with the property node ? Is the timing done through the software or is it hardware controlled ? I am using a M series PCI-6229 DAQ card.

i want to delay the AO by around 20 micro seconds from the digital trigger.

thanks

Colm 

[SachaE]

Hi Colm,

the Start>>More>>Delay Units Property help says

Specifies the units of Start>>More>>Delay.

Sample Clock Periods (10286)	Complete periods of the Sample Clock.
Ticks (10304)	Timebase ticks.
Seconds (10364)	Seconds.

Start>>More>>Delay

Specifies an amount of time to wait after the Start Trigger is received before acquiring or generating the first sample. This value is in the units you specify with Start>>More>>Delay Units.

So depending either on the Sample clock you've got setup, or the Timebase you're using it is then hardware controller, but you must make sure that you've armed the trigger before it actually arrives.

20uS on a timebase of 20MHz is a resolution 50ns, so a delay of 400.

If you specify in seconds, then it will be calculated and linked to the master timebase.

By deafult the delay units should be on Ticks

Hope that helps

Sacha Emery National Instruments (UK)

Message Edited by SachaE on 03-27-2006 03:59 PM

Message Edited by SachaE on 03-27-2006 04:00 PM