LabVIEW Electrical Power Toolkit

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Is The Resampler Really Capable Of Switching Reference Channel?

We have had an issue where an application we have written based on the power quality examples was switching reference channel unexpected.

 

The switching was caused by a bug in the example channel switcher which I have reported to NI directly.

 

However it highlight an interesting issue - when the reference channels switchs there are a lot of spurious events generated - I believe due to filters in the resampling algorithm taking time to resettle (we see these for about a second).

 

The question is, is there a way to use this and switch reference channels without causing filter effects? What other affects might this cause? We see ripples on dips which I believe to also be caused by the filters - could this be true and if so again, what could be done to remove these?

 

I attach a screenshot of one such dip generated in the lab.

dip-with-ripple.png

James Mc
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CLA and cRIO Fanatic
My writings on LabVIEW Development are at devs.wiresmithtech.com
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