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OIP3 limitation of PNA-X N5242A

Question asked by sfoong on Aug 13, 2012
Latest reply on Aug 18, 2012 by Dr_joel
Lately I am testing a 11-24GHz product using PNA-X N5242A. I notice that the PNAX shows 33-34dBm OIP3 itself (without connecting to any DUT, just a through line connecting source at Port 1 and analyzer receiver at Port 2).

I have captured the result and attach the photo here. The setting is PIN=-15dBm, IF Bandwidth=1Hz, Attenuator= 10dB. I have tuned the attenuator value and the best OIP3 that I can get is around 33dBm with 10dB attenuation.

May I know is 33dBm the limitation of PNAX at 11-24GHz?