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pna - external test set - reference level

Question asked by anjali on Mar 8, 2007
Latest reply on Mar 8, 2007 by Dr_joel
We have this pna with external test (pulse modulator). The reference signal R1 is tapped from the test set coupler output. When the source power at Port 1 is increased (or decreased), we expect the reference R1 to increase or decrease in conformance. But we observe the R1 trace jumps disproportionately, in a manner that seems to be related to the attenuator Auto setting.
Why does the Attenuator setting affect the R1 level?.  Something doesn't seem to be right here.
Please help