Synchronization features 2 usb-6009 - please help

Hello

I'm trying to simultaneously capture data from 2 devices usb-6009.  I've implemented the two Renault as follows.

1. using a function generator, generate a sine wave, which is slower and not a multiple of the sampling notes (48 kHz) and apply it on the odd numbered tracks.

2. connect the pairs of channels on the ground.

3. connect the PFI0 to a digital output of one of the Renault.

4. implement each DAQ sample faster (48 kHz) as possible and trigger off the coast of PFI0 entry.

5 generate the shutter of digital output - software write to 'Dev1/port0.

6. read samples that result and determine the difference between each of the odd channels between the Renault in a given set sample.

My results are not as expected.  Use Excel to plot the data, I see that the Renault 2 data are staggered on each set of sampling.

I checked on the scope that the trigger works and that both got triggered.  I think that the configuration above is not complete and I think I need to

Configure the two Renault to share the same clock source, but I don't know how to set up 2 Renault to share the same clock.  My questions are

(1) exceeds my setup ok?

(2) If you need to configure 2 Renault share the same clock, how to put in place?

(3) is it possible sync 2 devices usb-6009?

Thank you

Tuan

Your above configuration seems correct.

The method that you use to synchronize two devices is the best you can get.  The PFI line can only read in a trigger or a counter of entry.  You cannot use to import a sample clock.  Each 6009 must use its own on-board clock.

Typically, if you really want to sinchronize both acquisitions you must share a sampling and a trigger to start clock.  Here, we are only able to share a departure with the PFI line trigger (such as material prevents you from sharing the clock) and let the individual clocks govern the actual acquisition is simply not possible really to synchronize two 6009 s and you're doing the best you can.

Corn

Tags: NI Software

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