Keysight FieldFox Handheld Analyzers Service Guide 47
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
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 on page 48. Identifying discrepancies of the traces in
these windows can help you to isolate the faulty assembly.
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