Keysight Technologies N5247B, Service Manual

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3-62 Keysight N5247B Service Guide
Tests and Adjustments
Adjustments
3-
Noise Figure Adjustment (Available with Option 029 with S93029A/B
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
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
Procedure
1. Press UTILITY , then , then , then
click Noise Adjustment.
2. On the PNA Noise Adjustment dialog box (see Figure 3-21 ):
Option 029 enables noise figure measurements up to 50 GHz.
Equipment Type Model or
Part Number
Power Meter N1914A or equivalent
Power Sensor 8487A, N8487A, or
N8488A
RF Cable, 2.4 mm -f- to -f-
-or-
RF Cable, 1.85 mm -f- to -f-
85133C or 85133E
N4697E
ECal module, 2.4 mm, -m- to -f-
-or-
ECal module, 2.4 mm, -m- to -f-
N4693A-M0F
N4694A-M0F
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.
System
Service Adjustment Routines