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Odd phenomena with N9020A Amplitude measurements

Question asked by ravoncat on Aug 15, 2013
Latest reply on Aug 21, 2013 by tabbott
We are using the N9020A to calibrate and test the power output of signal sources and noticed an odd phenomena - when we test the signal source with the same spectrum that was used to calibrate it we get results centered around the nominal value as expected, however when a different spectrum is used to test the source the results are offset by ~0.5-0.7 dB (after compensating for line losses between the source and the spectrum. 

Any idea what could cause this?