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Trying and failing at performing velocity measurements

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Not sure which of those counter types I have.

 

I'm using an NI-9178 chassis and NI 9411 digital input card, both of which are less than a year old.

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The manual for the 9178 refers to an STC3 chip.  I suspect it's got essentially the same behavior I described for the DAQ-STC3 chip in desktop plugin boards.  Unfortunately, that's bad news for your particular data sync needs.

 

A possible workaround is to configure an additional counter to do 2-edge separation measurement from the Arm Start trigger edge until the active frequency-measurement edge.

 

 

-Kevin P

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