152 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
A9 Input Attenuator and A10 Input Attenuator Verification
Calibrator Switch Test
On the A16 Reference assembly, disconnect semi rigid cable W3 from A16J701
and measure A16J701 with a spectrum analyzer. Expected signal is 50 MHz at
−
25 dBm
±
0.5 dB. If signal level is incorrect, suspect A16 Reference assembly
is faulty, or the 50 MHz calibrator amplitude requires adjustment using the
field calibration software.
To verify calibrator switch operation, connect external signal source set to 50
MHz and
−
25 dBm to the RF input connector of analyzer under test. Press
Input/Output
,
RF Calibrator
,
Off
. If the signal level at the attenuator output is
now correct, suspect the A9 Attenuator cal switch or a faulty control signal
from the A15 Front End Controller assembly.
Attenuator Check
Set the signal source connected to the analyzer input port to 0 dBm. On the
analyzer, press
Amplitude
,
Attenuation
, and change input attenuation to 0 dB.
The measuring spectrum analyzer connected to A10 Attenuator output port
should indicate a 0 dBm level.
Change the input attenuation on the analyzer under test to 2 dB. See the chart
below for expected measurement values at the A10 Attenuator output port.
Analyzer Under Test
Attenuator Setting (dB)
Power at A10 Output Port
Input Attenuator Being Tested
0
0 dBm (reference)
Both set to through path
2
−
2
A9
4
−
4
A9
6
−
6
A10
8
−
8
A9 set to 2 dB,
A10 set to 6 dB
10
−
10
A10
20
−
20
A10
30
−
30
A10
40
−
40
A10
50
−
50
A10
60
−
60
A10
70
−70
A9 set to 4 dB,
A10 set to 66 dB
Содержание N9040B Option 513
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Страница 138: ...138 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Messages Condition Messages ...
Страница 240: ...240 Chapter 11 Hardware Options A21 Wideband Analog IF Troubleshooting Figure 11 1 Analog IF Block Diagram ...
Страница 256: ...256 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Block Diagrams Block Diagrams Block Diagrams ...
Страница 306: ...306 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts Figure 14 2 External Hardware ...
Страница 338: ...338 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts Figure 14 28 Chassis ...
Страница 346: ...346 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts ...
Страница 502: ...502 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Post Repair Procedures ...
Страница 532: ...532 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Functional Tests Scale Fidelity ...
Страница 536: ...536 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Software Software Updates ...
Страница 541: ...Index Index 541 Y yellow LED 48 51 yig filter see A12 YTF YTF see A12 YTF ...