Agilent Technologies 8590 Series Service Manual page 264

Troubleshooting the IF Section
IF Power-Level Measurement
Table 5-4 Calibration-Attenuator Control Lines
Reference Calibratio
Level n
(dBm) Attenuato
r
0 10
−1
9
−2
8
−3
7
−4
6
−5
5
−6
4
−7
3
−8
2
−9
1
H = >2.5 V (TTL High)
L = <0.8 V (TTL Low)
264
IFA1 IFA2
(1 dB) (2 dB)
A12J2-4 A12J2-3
L H
H L
L L
H H
L H
H L
L L
H H
L H
H L
IFA3 IFA4
(4 dB) (8 dB)
A12J2-2 A12J2-1
L H
L H
L H
H L
H L
H L
H L
L L
L L
L L
IFA5
(16 dB)
A12J2-11
L
L
L
L
L
L
L
L
L
L
Chapter 5