Agilent Technologies 8753ES Option 011 Service Manual page 324

Service Key Menus and Error Messages
Service Key Menus
Node 18 IF Det 2N (IF on A11 phase lock after 3 MHz filter)
Perform step A11 and then press
Scale Ref AUTOSCALE
This node detects the IF within the low pass filter/limiter. The filter is used during the
track and sweep sequences but never in band 1 (3.3 to 16 MHz). The low level (about
−1.7 V) means IF is in the passband of the filter. This node can be used with the FRAC N
TUNE and SRC TUNE service modes.
Figure 10-13 Analog Bus Node 18
Node 19 IF Det 2W (IF after 16 MHz filter)
Perform step A11 and then press
Scale Ref 0.2 x1
This node detects IF after the 16 MHz filter/limiter. The filter is used during pretune and
acquire, but not in band 1. Normal state is a flat line at about −1.7 V.
10-34
ANALOG IN
Meas
.
ANALOG IN
Meas
REFERENCE VALUE
18 x1 Stop
19 x1 Stop
−1.2
.
x1
20 M/µ
20 x1
Chapter 10