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How measure the electrical length with HP 8719C VNA?

Question asked by neogsj on Nov 9, 2011
Latest reply on Apr 30, 2012 by Dr_joel

I need to measure a unknown adapter's electrical length with HP 8719C VNA.
Is there any direct way that I can measure the electrical length?

I have a adapter (94.75ps) of 85052D 3.5mm economy calibration kit as a reference. I tried to measure the electrical length of the calibration kit adapter by DELAY in the VNA, but it does not give the same result. I do not know if the group delay is related with the electrical length.

So how could I measure the electrical length correctly with VNA?

Thank you.