Keysight NFA Series Noise Figure Analyzers Service Guide
183
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
Troubleshooting
5. Input Attenuator B Control Logic Verification
Press
AMPTD
,
Attenuation, Mech Atten, 6 dB
and verify the 6 dB Step LED
DS17 is illuminated. Enter the input attenuation settings found in
and verify the proper LED's illuminate on the Front End Troubleshooting board
according to
Set the input attenuator back to 10 dB by pressing
AMPTD
,
Attenuation
,
Mech
Atten, 10 dB
on the analyzer. If the LED's illuminate correctly, the switch
control logic for the input attenuators from the A15 Front End Control
Assembly is correct. If the LED's are not illuminating as expected, the most
probable cause is the A15 Front End Control Assembly.
Table 4-12
Attenuator B Logic
Attenuator
Setting (dB)
DS20
30 dB
Step LED
DS19
20 dB
Step LED
DS18
10 dB
Step LED
DS17
6 dB
Step LED
10
X
16
X
X
20
X
30
X
40
X
X
50
X
X
60
X
X
X
Содержание N8973B
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Страница 132: ...132 Keysight NFA Series Noise Figure Analyzers Service Guide Instrument Messages Condition Messages ...
Страница 228: ...228 Keysight NFA Series Noise Figure Analyzers Service Guide RF Section Troubleshooting N8976B Troubleshooting ...
Страница 268: ...268 Keysight NFA Series Noise Figure Analyzers Service Guide Analog Digital IF Troubleshooting 25 MHz BW IF Section ...
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Страница 350: ...350 Keysight NFA Series Noise Figure Analyzers Service Guide Service and Diagnostics Menus Front Panel Key Test ...
Страница 470: ...470 Keysight NFA Series Noise Figure Analyzers Service Guide Assembly Replacement Procedures Front Frame Assembly ...