Lockin demodulator VI isn't outputting anything

[joshmont]

I'm working on implementing a software lockin comparable to those illustrated in many discussion posts.  I'm trying to use the proprietary VIs in the LockinStartupKit (the newer version with the SCOPE VIs).  Using the many examples posted in these fora (e.g. the wiring is nearly identical to that in the startup kit's "simple demo"), I'm testing the code by using the same 1 MHz sine wave for reference and input signals.  By stepping through the execution with breakpoints, it seems everything is working perfectly (i.e. the 2D data array goes through, the reference frequency picked out by the PLL is correct, ...) up until the final "Lockin Demodulator" VI, where nothing comes out (i.e. a null array seems to be in the "Data (out)" indicator). 

Since I can't peek inside the mystery VIs, can any NI engineers with a bit more insight help me identify what (unfortunate) magical things are happening inside that VI to thwart my code?

Thanks!

[EEsRULEtheWORLD]

Hi joshmont,

Could you direct me to where you had installed the Lock-in Amplifier Startup toolkit that uses NI-Scope?

[joshmont]

I'm not sure I understand your question.  If you're asking where I found the VIs, here is an example that uses some of the NISCOPE VIS: http://forums.ni.com/t5/Dynamic-Signal-Acquisition/lock-in-amplifier/td-p/1057126

In that example, the canned (private) VIs are used in conjunction with the standard VIs.  I'm not using precisely those NISCOPE VIs, but similar ones.

-Josh