HP 8753D Option 011 Service Manual page 264

Node 7 Log (log ampli er output detector)
Perform step A3, above, to set up a power sweep on the analog bus. Then press MEAS
ANALOG IN 7 x1 SCALE REF
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Node 7 displays the output of a logger circuit in the ALC loop. The trace should be a linear
ramp. Absolute voltage level variations are normal. Flat segments indicate ALC saturation
and should not occur between 15 dBm and +10 dBm.
The proper waveform at node 7 indicates that the circuits in the A3 source ALC loop are
normal and the source is leveled.
Figure NODE7 here.
Node 8 A3 Gnd (ground)
RAFT
3/21/106 15:14
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AU O SCALE
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Figure 10-9. Analog Bus Node 7
Service Key Menus and Error Messages 10-25
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