Keysight NFA Series Noise Figure Analyzers Service Guide
187
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
Troubleshooting
8. Front End Assembly Control Logic Verification
Since the RF Front End Troubleshooting board is connected, now is a good
time to test out the remaining control circuits from the A15 Front End Control
Assembly.
Table 4-17
Front End Control Logic
Test Point
Description
Instrument Settings
Voltage
(VDC)
Tolerance
(VDC)
S2A
Sets switch for Low Band/preamp path
CF 50 MHz preamp on
+9.67
±
0.5
S2B
Sets switch for Low Band/preamp path
CF 50 MHz preamp on
+9.83
±
0.5
S3A
Sets E-atten to 5 dB preamps off
E-atten = 5 dB
+9.67
±
0.5
S3B
Sets E-atten to 5 dB preamps off
E-atten = 5 dB
+9.83
±
0.5
S4A
Sets E-atten to 10 dB preamps off
E-atten = 10 dB
+9.67
±
0.5
S4B
Sets E-atten to 10 dB preamps off
E-atten = 10 dB
+9.83
±
0.5
S5A
Sets E-atten to 2 dB preamps off
E-atten = 2 dB
+9.67
±
0.5
S5B
Sets E-atten to 2 dB preamps off
E-atten = 2 dB
+9.83
±
0.5
S6A
Sets E-atten to 1 dB preamps off
E-atten = 1 dB
+9.67
±
0.5
S6B
Sets E-atten to 1 dB preamps off
E-atten = 1 dB
+9.83
±
0.5
S7A
Sets E-atten to 2 dB preamps off
E-atten = 2 dB
+9.67
±
0.5
S7B
Sets E-atten to 2 dB preamps off
E-atten = 2 dB
+9.83
±
0.5
S8A
Sets E-atten to 20 dB preamps off
E-atten = 20 dB
+9.67
±
0.5
S8B
Sets E-atten to 20 dB preamps off
E-atten = 20 dB
+9.83
±
0.5
S9A
Controls in & out to low band preamps off
E-atten = off
+9.83
±
0.5
S9B
Controls in & out to low band preamps off
E-atten = off
+9.67
±
0.5
S11A
Sets path for 1st or 2nd L.O.
CF 1 GHz
+9.67
±
0.5
S11B
Sets path for 1st or 2nd L.O.
CF 1 GHz
+9.83
±
0.5
S12A
Sets path for L.O. normal or
x2 for band 4
CF 1 GHz
+9.83
±
0.5
S12B
Sets path for L.O. normal or
x2 for band 4
CF 1 GHz
+9.67
±
0.5
S13A
Sets path for L.O. to either of the high band
mixers and L.O. output
CF 5 GHz
CF 20 GHz
−
9.67
+9.67
±
0.5
S13B
Sets path for L.O. to either of the high band
mixers and L.O. output
CF 5 GHz
CF 20 GHz
+9.83
−
9.83
±
0.5
S14A
Sets path to either band 1 & 2 mixer or band
3 & 4 mixer
CF 5 GHz
CF 20 GHz
−
9.83
+9.83
±
0.5
Содержание N8973B
Страница 4: ...4 ...
Страница 44: ...44 Keysight NFA Series Noise Figure Analyzers Service Guide Overview How to Return Your Instrument for Service ...
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 ...
Страница 322: ...322 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams Block Diagrams ...
Страница 332: ...332 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams NFA Computer Block Diagram ...
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 ...