Keysight Technologies 8480 Series, Operating And Service Manual

Page: 63 / 99

Service 3
Keysight 8480 Series Operating and Service Manual 63
Repair
Power Sensor repair consists of replacing either the A1 Bulkhead Assembly, or the
A2 Power Sensor Board Assembly.
A1 Bulkhead Assembly
Repair Strategy
The recommended repair strategy for the A1 Bulkhead Assembly is to completely
replace it. The replacement Bulkhead is calibrated at the factory, and is supplied
with a calibration report and a new calibration sticker for the Power Sensor.
Procedure
1 Order your new or restored A1 Bulkhead Assembly from Table 2-2 .
2 Follow the disassembly and reassembly procedures for Bulkhead removal and
replacement. See “Disassembly / Reassembly Procedures” on page 69.
3 Check the FET balance using the procedure described in “FET Balance
Adjustment” on page 65. If you did not disturb the wires, it is likely that no
adjustment is necessary.
4 Place the new calibration sticker on the plastic shell of the power sensor.
NOTE
Although the recommended Bulkhead strategy is to completely replace it, we
are aware that some customers have both the ability and experience that
enables them to disassemble and repair Bulkheads to a lower level. For this
reason, Appendix B provides exploded views of the various Bulkheads, and
tables listing the parts.
Lower level Bulkhead repair can be more economical than replacement,
although this may be offset by the need to invest in sensor calibration
equipment and a SWR test set-up.