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Best method to measure absolute and/or relative delay

Question asked by Alman on Jan 19, 2009
Latest reply on Jan 20, 2009 by Dr_joel
Using an Agilent E8364A PNA, what is the best method to measure electrical delay?  I am most interested in the electrical length of one path compared to another across frequency very accurately.  I have been using the raw phase, as well as adding delay to unwrap the phase, to be able to view the phase across frequency.  Using the same added delay, I am comparing the difference in the phase at different frequencies.

Also, using VEE, is it straightforward to compute this from the s-matrix?  I have been simply subtracting the phase, and using the Matlab unwrap function, and seem to get differing results when the unwrap function is used.

Thanks in advance.