NI PXI 6289 and PXI 6259 Analog output synchronization issues

[zague]

Hello, I'm currently working with NI PXI 6289 and 6259, mounted on a NI-PXI 1010 Chassis.

I need to generate 1 analog waveform from each board to emulate voltage and current AC signals.

My problem is that my application needs to have both signals synchronized, but the signals drift in phase over time.

I'm using a trigger for each board, ant the waveform generation starts at the same time, but still drifts.

Is there anything I can do to avoid such a drift?

The controller is NI PXI 8187.

Any additionall hardware is needed to achieve a nice synchronization?

Kind regards.

El Zague

[croohcifer]

Hi El,

You need to set the DAQmx timing properties for Reference Clock Source to "PXI_Clk10" and the Reference Clock Rate to "10,000,000".  Do this on BOTH analog output tasks and any other concurrent hardware timed tasks on either board.

David

[zague08]

Hi David, many thanks for your reply.

Unfortunately, I can't manage to solve my problem. Once I change the clock source to "PXI_Clk10", CPU load goes to 100% and stop working.

[croohcifer]

Can you successfully run an analog input synchronization DAQmx example that uses a reference clock synchronization approach?  What language are you coding in?  Can you please post the SIMPLEST reproducing example of your code that causes the error?