48 Keysight Agile Signal Generator Service Guide
Troubleshooting
Troubleshooting the RF Path
Troubleshooting the RF Path procedure:
— Preset the signal generator
— Turn User Max Settable off (System-> User Max Settable Power-> User Max
Settable Power State -> off)
— Set a frequency
— Open ALC loop (ALC Off)
— Set signal generator to maximum power (+23 dBm)
— Check power levels in the RF path using "Troubleshooting RF Power
Levels", below.
Troubleshooting RF Power Levels
The following information has been provided to aid in troubleshooting power
levels in the RF path:
—RF Block Diagrams (see “Overall Block Diagram” on page 6 and
“Assemblies and Modules” on page 7. The block diagrams show signal
flow, path frequency ranges, and minimum power levels at a few key points
in the RF path, for example: A17J5, A18J4… A17J2.
— A Max Power Output tables (Table 1-3 and Table 1-4). The tables provide
the minimum power output at the output connector within assembly
When troubleshooting the instrument, the troubleshooting procedure may
refer you to the RF Block Diagram, the Max Power Output table, or both.
To verify the output power of a part, locate the part in the Device Output Power
table. Measure the output and input power levels. If the part is not meeting the
specified power, the part most likely needs to be replaced. In cases where the
part fails to meet its specification but comes very close, measure the minimum
input power level into the part before replacing the part.
To verify the minimum power into a part, locate a point on the RF path where
output power is specified, then use the Device Output Power table to calculate
the minimum power level at the specific location. If the minimum power level is
not present, measure the output of the first device showing a power level on
the RF Block Diagram, then measure the input and output power level for each
device in the path until the defective part is located.
Approximate Device Output Power
You can troubleshoot assemblies in the RF path by measuring power output
and comparing them to the tables below. See “Troubleshooting the RF Path”
on page 48 for more information.
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