Agilent Technologies N5241A, Руководство по обслуживанию

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3-44 Service Guide N5242-90001
Tests and Adjustments PNA Series Microwave Network Analyzers
Adjustments N5241A/42A
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
Procedure
1. Press UTILITY , then , then , then click Noise
Adjustment
.
2. On the PNA Noise Adjustment dialog box (see Figure 3-18 ), leave all three 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\Agilent\Network Analyzer\Noise
directory, but can also exist elsewhere.
Equipment Type
Model or
Part Number
Noise source 346A/B/C
Adapter, 3.5 mm, -f- to -f- 83059B
RF Cable, 3.5 mm -f- to -f- 85131C
ECal module, 3.5 mm, -m- to -f- N4691B-M0F
System
Service Adjustments