Agilent Technologies 8753ES Option 011 Service Manual page 325

Node 20 IF Det 1 (IF after 30 MHz filter)
Perform step A11 and then press
REFERENCE VALUE
The trace should be a flat line across the entire frequency band at least 0.5 V greater than
Vbb (node 14). The correct trace indicates the presence of IF after the first 30 MHz
filter/limiter.
Figure 10-14 Analog Bus Node 20
A12 Reference To observe the A12 analog bus nodes perform step A12, below. Then
follow the node-specific instructions.
Step A12: Press
Preset
ANALOG BUS ON
Node 21 100 kHz (100 kHz reference frequency)
Perform step A12 and then press
COUNTER: ANALOG BUS
used on A13 (the fractional-N analog assembly) as a reference frequency for the phase
detector.
Node 22 A12 Gnd 1 (ground)
Chapter 10
Meas
−1.29
.
x1
ANALOG IN
Meas
MORE REAL
Format
Meas
. This node counts the A12 100 kHz reference signal that is
Service Key Menus and Error Messages
ANALOG IN
20 x1
Marker System
.
ANALOG IN 21
Service Key Menus
Scale Ref 0.3
SERVICE MENU
x1
x1
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