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Weired second harmonic testing response from PNA-X 5245

Question asked by dahuang on Apr 5, 2011
Latest reply on Apr 6, 2011 by Dr_joel
Dear NVA team,

Thanks for your notice on this message.

I have been using PNA-X to measured the harmonic signal generation from some nonlinear devices. However, I got some weired response from the PNAX 5245A with firmware  A.08.60.07.

I generate signal from port 1 and measure the fundamental and second harmonic signal at port 2. Measure "B" at the second harmonic with frequency offset mode "on". However, the measured second harmonic signal has a discontinuity around 630MHz. I am wondering where the source of this discontinuity is.

The measured SHG signal is attached.