One or more user channels appear faulty. The question is, what is at fault?, the source or test set or IF/
detector (HP 85102). The service adapter is a source/test set emulator. It provides the same 20 MHz
signal to the HP 85102B as the test set and source. Thus it indicates whether the problem is in the IF/
detector.
l
HP 85102B service adapter (provided in the
Service Manual, see SERVICE TOOLS)
l
BNC to BNC cable
SOURCE TEST SET
HP 85102
Figure 5-l 9. HP 85102 Signal Path
with
Service Adapter
HP
Test Sets
Test Set Troubleshooting 5-29