Periodic delay PXI-6220

[GPGPR]

Hi,

Using Ni-DAQmx on WinXP, im acquiring data on demand synchronized on an external pulse(20Hz).

Every data are envenly time space except a periodic 10ms delay.

Is Window could be the origine of that delay?

Any hint?

Thanks

Guillaume

Message Edited by GPGPR on 02-27-2007 10:38 AM

[Elijah_K]

If you setup a DAQmx task for on demand mode it'll be software timed.  Windows is a non-deterministic operating system, which means that your task will be at the mercy of the operating systems and any other processes that request system resources.  Delays could potentially be the result of using on Demand.

If you board has hardware timing you'll be ablle to setup the acquisition for continuous or finite mode, which will give you much more accurate timing.