Noise Figure Adjustment (Available With Option 029 With S93029A/B Installed) - Keysight N5247B Series Service Manual

Tests and Adjustments
Adjustments
Noise Figure Adjustment (Available with Option 029 with S93029A/B
Installed)
Option 029 enables noise figure measurements up to 50 GHz.
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
four 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.
— Bandwidth Offset Adjustment: removes any offset that may occur between
various bandwidth settings.
— Noise Correction Adjustment: overwrites the factory noise receiver
calibration.
Equipment Used for the Noise Figure Adjustment
Equipment Type
Power Meter
Power Sensor
RF Cable, 2.4 mm -f- to -f-
-or-
RF Cable, 1.85 mm -f- to -f-
ECal module, 2.4 mm, -m- to -f-
-or-
ECal module, 2.4 mm, -m- to -f-
Adapters may be required, depending on the equipment you use.
Equipment with 2.4 mm connectors can be used since noise figure
measurements are not recommended above 50 GHz.
Procedure
1. Press UTILITY
click Noise Adjustment.
2. On the PNA Noise Adjustment dialog box (see
3-62
Service
System , then
Model or
Part Number
N1914A or equivalent
8487A, N8487A, or
N8488A
85133C or 85133E
N4697E
N4693A-M0F
N4694A-M0F
Adjustment Routines
, then
Figure 3-21):
Keysight N5247B Service Guide
, then