Noise Figure Adjustment (Available Only With Option 029 Installed) - Keysight N5241A 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
Noise Adjustment.
2. On the PNA Noise Adjustment dialog box (see
adjustments 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\Keysight\Network
Analyzer\Noise directory, but can also exist elsewhere.
3-54
Service
, then
System
Keysight N5241A/42A/49A Service Guide
Model or
Part Number
346A/B/C
83059B
85131C
N4691B-M0F
Adjustments
, then , then click
Figure 3-19), leave all three