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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
CAUTION! New LabVIEW adopters -- it's too late for me, but you *can* save yourself. The new subscription policy for LabVIEW puts NI's hand in your wallet for the rest of your working life. Are you sure you're *that* dedicated to LabVIEW? (Summary of my reasons in this post, part of a voluminous thread of mostly complaints starting here).
