Agilent Technologies FieldFox MW N9913A, Руководство по обслуживанию

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N9927-90003 4-9
FieldFox Analyzer Troubleshooting
Measurement Group Troubleshooting
Measurement Group Troubleshooting
• Make sure the unit is warmed up for at least 30 minutes.
• Make sure the correct cal kit definition is being used; erase user data to force use of factory cal kit
definitions (see
Chapter 8 for information on the “Erase User Data Utility” ).
Problems in NA Mode
Every FieldFox contains a factory calibration that was performed at the port 1 and port 2 connectors over
the entire frequency range of the FieldFox using a number of data points that allows reasonable
interpolation over the FieldFox frequency range.
This calibration, known as CalReady, allows you to immediately make accurate measurements for a
DUT that is connected directly at the test ports (PORT 1 and/or PORT 2). CalReady corrects
measurements when the FieldFox is turned ON, when Preset is pressed, and when a measurement is
created with no other correction in place.
If you are seeing a problem at Preset, perform the standard S-parameter test set troubleshooting
procedure, starting with the following procedure:
“Checking the A, B, R1, and R2 Signals (NA Mode)” .
Checking the A, B, R1, and R2 Signals (NA Mode)
The first step is to verify that the A, B, R1, and R2 traces are present and that they are approximately
level:
• To access this:
1. Press
Trace
,
3
2. Select <Num of Traces>
3. Choose <x4>
4. Select <Trace 1>
5. Press
Measure
,
1
6. Choose <Advanced>
7. Select <A>
8. Repeat Steps 1, 4, 5, 6, and 7 for Receivers B, R1, and R2.
• Traces A, B, R1, and R2 are displayed in four separate data windows as shown in Figure 4-2. .
Identifying discrepancies of the traces in these windows can help you to isolate the faulty assembly.