Noise Figure Adjustment (Available Only With Option 029 Installed) - Agilent Technologies N5242A 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
Adjustment.
2. On the PNA Noise Adjustment dialog box (see
selected in the "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\Agilent\Network Analyzer\Noise
directory, but can also exist elsewhere.
3-44
Service
, then , then
PNA Series Microwave Network Analyzers
Model or
Part Number
346A/B/C
83059B
85131C
N4691B-M0F
Adjustments
, then click Noise
Figure 3-18), leave all three adjustments
Service Guide N5242-90001
N5241A/42A