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S parameter will change during the measurement in HP8510C

Question asked by cyzhu on Jan 7, 2011
I'm now using HP8510C for S-parameter measurement.
When labview is communicating and extracting the S11 value from the machine, I can clearly see that the curve of S11 in the Smith Chart is changing (or distorting from the real curve). After the communication process (the red dot disappeared from the screen), the curve of S11 will return to smooth. But for other three parameters, the curve will not change during the communication.

Another interesting thing is, when I press S11 button, the screen will first show a distorting curve, and then return to normal smooth curve after very short time. For other three buttons, it's not happening.

I really appreciate if someone can help me out.