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How do I measure time delay between two signals?

Hello,
 
I am using Labwindows/CVI 8.5, NI5112 Scope card, on WinXP OS. I have two 790 Hz sine wave signals (one at channel a, and the other at channel B) which are 180 degrees out of phase. I want to measure the time delay between them. I used the "Time Delay" measurement function on the Scope Soft Front Panel but I did not get the expected 0.0006329sec time delay. Also, I tried the "Phase Delay" measurement function. That also did not give me the expected 180 degrees phase delay. The question is how do I set it up on the Scope Soft Front Panel to measure the time delay? Any help would be appreciated.
Thank you.
 
Robert
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Ana P
National Instruments
Applications Engineer
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