Agilent Technologies 8590 Series Service Manual page 263

Control lines for the A12 amplitude control assembly
Table 5-3
analog interface assembly that change the gain of the A12 assembly
when the reference level is changed. The calibration attenuator settings
in
full reference-level range of the analyzer.
Refer to
chapter when tracing control lines in the IF section. The entries in
Table 5-3
Be sure that the input attenuator setting remains at 10 dB.
Table 5-3 10 dB Step-Gain Control Lines
Reference
H = >2.5 V (TTL High)
L = <0.8 V (TTL Low)
For each reference level in
lines are set to 10 dB of attenuation as shown in the first entry of
Table
each reference level in
1 dB increments.
Chapter 5
and Table 5-4
Table 5-4 provide reference-level changes in 1 dB increments for the
"Troubleshooting the A15 Motherboard Assembly"
and Table 5-4
PRESET
CAL
More 1 of 3
(OFF)
CORRECT ON OFF
10 dB
Level Step Gains
(dBm)
0 0
−10
10
−20
20
−30
30
−40
40
−50
50
5-4. The control line settings from
provide the control line output from the A7
are valid after pressing the following keys.
IFG1
(10 dB Step)
A12J2-14
L
H
L
H
L
H
Table 5-3, the Calibration Attenuator control
Table 5-4
Table 5-3 to produce reference-level changes in
Troubleshooting the IF Section
IF Power-Level Measurement
in this
IFG2 IFG3
(20-1 dB (20-2 dB
Step) Step)
A12J2-13 A12J2-12
L L
L L
H L
H L
H H
H H
repeat, starting with
263