Synchronization of a PCI-5114 with a USB-6229

Hello

I'm doing several measures with a couple of scanners OR: the first is a PCI-5114 who reads a signal using the maximum sampling frequency of the 5114.  It works currently, and is triggered by a digital pulse at 1 Hz.

Secondly, I have 5 other channels, and I want to measure the maximum voltage on each (analog inputs), at the time the PCI-5114 saves the data.  My thought was that I could have the USB-6229 reading data continuously, then 5114 triggers, once I read the files ~ 1000 previous of the 6229.  I'm not sure it will work, because I can't be sure that the data the 6229 collects will be the same time as the data that the 5114 collects.  Is there a smart way to ensure that is the case? (external clocks, exported triggers the 5114... I do not know what are the options)

For full disclosure, I have 8 digital outputs through the same USB-6229.

Furthermore, if there is a good way to measure the max of each of my 5 channels without having to download 1000's of data points, which would also work.

Any help or advice is much appreciated!  Thank you!

Karl

Hi Karl,

The reference of 6229 media triggering (manual link), if you could start it off the same signal of 1 Hz you use to trigger your scope.  You can specify the sampling frequency, number of samples and number of samples to relax pre - this should allow you to correlate your acquisition on the map of data acquisition to the time window even that your scope is acquiring data.  The clocks would still be independent, but I don't think it matters too much because you are triggering the same external signal every second.

After that the DAQ trigger card you will need to re - start the task in software to re - arm (something like in This example), but the interval of 1 Hz should be more than enough to do this.

Best regards

Tags: NI Hardware

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