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Occasional Phase data loss

Question asked by rezah on Feb 22, 2011
We are doing a band gap study and have a recent problem with our microwave HP 8510C Network Analyzer. We get occasional loss of the phase data.

It usually works fine when we pick less points in the stimulus, like 51 or 101 but after some time we lose the phase data again. It does not work at higher points .
The transmission information and the magnitude of the field are still there but the phase information is lost.
I wonder if anybody had such a problem before or can give me a suggestion.