Noise Figure Adjustment (Available Only With Option 029 Installed) - Keysight N5221A Service Manual

Tests and Adjustments
Adjustments

Noise Figure Adjustment (Available Only with Option 029 Installed)

The noise figure adjustment should be performed after replacing any component in the noise figure circuitry,
or if the PNA fails the noise IF gain portion of the Op check. The noise figure adjustment consists of the
following three sections:
• Noise Compression Adjustment: sets the warning level for overpower conditions at the noise receiver.
• IF Gain Cal Adjustment: sets IF Gain flatness for the noise receiver.
• Noise Correction Adjustment: overwrites the factory noise receiver calibration.
Equipment Used for the Noise Figure Adjustment
Equipment Type
Noise source
Adapter, 3.5 mm, -f- to -f-
RF Cable, 3.5 mm -f- to -f-
ECal module, 3.5 mm, -m- to -f-
Procedure
1. Press UTILITY System
2. On the PNA Noise Adjustment dialog box (see
"Select Adjustments" box. Verify the directory path displayed in the "Select ENR Data File" box contains
the ENR file for the noise source you are using. If not the correct ENR file, click Browse to navigate to the
correct file. If the proper file does not already exist, click Create New to enter data for the noise source
you are using. The PNA will automatically remember and use the last file selected. These files should
normally reside in the C:\Program Files\Keysight\Network Analyzer\Noise directory, but can also exist
elsewhere.
3-48
Service Adjustments
, then , then
Figure
PNA Series Microwave Network Analyzers
Model or 
Part Number
346A/B/C
83059B
85131C
N4691B-M0F
, then click Noise Adjustment.
3-18), leave all three adjustments selected in the
Service Guide N5222-90001
N5221A/22A