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Network Analyzer Port Impedance conversion

Question asked by stanleymyc Employee on Apr 20, 2011
Latest reply on Apr 21, 2011 by Dr_joel
Both PNA and ENA has this features, the fixture simulator.

i am abit confuse with the purpose of 50ohm to 75ohm adapter, is it needed because of physical connection compatibility, or because we need convert 75ohm to 50ohm then only measure, if we need convert them to suit 50ohm system , then do we still need to change to 75ohm using port impedance conversion feature as we have convert physically to 50ohm form 75ohm.

and also, when we want to measure 75ohm, or 100 ohm, assuming there is no physical connection compatibility issue and they can connect directly to the NA , we change the port impedance using impedance conversion to 75ohm or 100ohm, but calibrate using 50ohm kit, is this correct method to do so?

thanks for anyone help.