Phase measured by two tone measurement have different dt

Dear all;
I write a labview program for isolated a signal from the mixture of two signals by using a reference input. I choose to use butterworth filter and apply it in bandpass mode. To determine the band width of the filter, I also use two tone measurement vi to detect the phase of the reference signal and the signal I want to outcome. Unfortunately, when I run my program, warming with message "waveforms have different dt value" is always show. How can I fix this problem?
Regards
Attachments:
lock-in test.vi ‏88 KB

Well you got a bad case of the DDT's and dt's
If you get rid of those express vis and use a vi from the waveform measurments pallette you won't get fooled by that dt that does not exist coming out of your filter
Of course you COULD use the Digital IIR Filter vi off the Waveform conditioning palatte and keep your dt info but that doesnt get rid of your DDT's
Here is one quick mod
Jeff
Attachments:
lock-in testmod.vi ‏36 KB

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Phase measured by two tone measurement have different dt

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