Hello,
I am using the NFX application on an N5247A with firmware version 10.60.03.
When I run the calibration wizard it goes through a power calibration (plus noise source, plus s-param) and I would like to measure calibrated receiver power on B. So I turn on the 'B_1' trace and the PNA says 'No Cor' on the bottom of the screen with the 'B_1' trace selected. If I try to turn on correction (Response->Cal->Correction on/OFF) an error message comes on the screen #515: "Calibration is required before correction can be turned on Channel number is 1, Measurement is 5."
Then I looked at the error terms using the Cal Set Viewer and the term ResponseTracking(b1) is present, so I would expect that the B receiver should be able to take corrected power measurements.
Is this a firmware bug or is there some other limitation why I cannot take corrected output power measurements of my mixer?
Thanks,
Jeremy
Hi Jeremy,
You are correct. The B_1 trace in NFX and NFA is not corrected and technically it could be. In a Noise Figure channel those receiver power traces are mainly there for troubleshooting purposes and I suspect that is why they are not included in the correction map. However, since you are using NFX (Noise Figure for Converters), there is another parameter that measures the same thing as B_1 and that is the OPwr parameter and that one is corrected. So just switch to OPwr and you'll be all set.