AnsweredAssumed Answered

PNAX Opt 29 Win 7 negative noise figure issue

Question asked by rok on Nov 10, 2014
Latest reply on Nov 12, 2014 by rok

I am using a PNA-X Win 7 version with opt 29 hardware noise figure hardware capability to measure noise figure for a downconverter with gain about 58. I am using A.10.20.02 firmware. I am also using the power meter method. 

The Noise figure settings I am using are:
Noise Bandwidth 2MHz
Averaging on at 25
Noise Receiver selected, with Receiver Gain set to 'Low'
Ambient Temperature =295K

The problem is that I'm getting negative noise figure! (see attached).  The only thing I noticed was that under 'Impedance States', the 'Noise Tuner' is set to 'None Selected', even though in the 'Path Configuration' window, the internal tuner is selected. (see attached)

As for the calibration, I am using the vector calibration using the internal tuner. 

Any advice would be greatly appreciated.