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To check control of the A3A5 input attenuator
The A7 analog interface assembly controls the three attenuator steps and
blocking capacitor in the A3A5 input attenuator using eight control lines.
Refer to the RF section block diagram for your analyzer at the end of
"Assembly Descriptions and Block Diagrams."
two control lines, as shown in Table 6-10 and Table 6-11. The attenuator is
connected to A7J5 on the A7 assembly with the ribbon cable, W36. Locate W36
using the top view of the analyzer in
Locations."
Use a digital multimeter (DMM) and the values from Table 6-10 to check the
control voltages. Measure the voltages at the A7J5 pins on the trace side of the
A7 assembly.
Table 6-10
Input Attenuator Control Output at A7J5 for 8592L and
8593E
Attenuator
Setting (dB)
Pin 2
0
H
10
L
20
H
30
L
40
H
50
L
60
H
70
L
H = 0 V (A floating output if the attenuator is disconnected.)
L = −15 V (A low at pin 2, 9, 8, or 7 indicates that the attenuator step is in the signal path.)
Chapter 6
10 dB
1st 20 dB
Step
Step
Pin 1
Pin 9
L
H
H
H
L
H
H
H
L
L
H
L
L
L
H
L
H = −10 V (with the attenuator connected at A7J5)
6b. 8592L/94L, 8594Q, and 8593E/94E/95E/96E
Each attenuator step requires
Chapter 11, "Major Assembly and Cable
2nd 20 dB
Step
Pin 4
Pin 8
Pin 5
L
H
L
L
H
L
L
L
H
L
L
H
H
H
L
H
H
L
H
L
H
H
L
H
Troubleshooting the RF Section
Chapter ,
3rd 20 dB
Step
Pin 7
Pin 6
H
L
H
L
H
L
H
L
L
H
L
H
L
H
L
H
291
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Troubleshooting
