HP 8753D Option 011 Service Manual page 262

Node 4 Det (detects RF OUT power level)
Perform step A3, above, to set up a power sweep on the analog bus. Then press MEAS
ANALOG IN 4 x1 SCALE REF
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Node 4 detects power that is coupled and detected from the RF OUT arm to the ALC loop.
Note that the voltage exponentially follows the power level inversely. Flat segments indicate
ALC saturation and should not occur between 15 dBm and +10 dBm.
Figure NODE4 here.
RAFT
3/21/106 15:14
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AU O SCALE
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Figure 10-7. Analog Bus Node 4
Service Key Menus and Error Messages 10-23
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