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Voltage Spikes in externally triggered analog voltage acquisitions

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Hello,

 

I'm trying to use a Triggered counter as a clock source for an analog voltage acquisition. I used the Multi-function-Ctr Retrig Pulse Train Generation for AI Sampleclock.vi as my template. It seems to be working, but in my acquired data it  there is a voltage spike associated with each trigger event. If I wire up one of the NI-daq board digital I/O lines and use that as a trigger source I don't see the spikes.

 

My hardware is a PCI-6259

 

Some Application Background:

 

I have a device that is scanning a laser. I'm using it to trigger different hardware acquisitions at each scan point (It has multiple digital outputs for this). VoltageSpikes.png


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