Keysight Technologies N9040B UXA Signal Analyzer Service Guide 243
Hardware Options
A21 Wideband Analog IF Troubleshooting
Verify the J18 Output
The J18 output is active only when the 40 MHz IF path is selected.
The following test can be used to assure the W41 cable and the switch on the
A21 Wideband AIF are good.
1.
To select the 40 MHz IF path, press
Meas Setup
,
IF Path
. Tap
IF Path
and
choose
40 MHz
from the drop down menu.
2.
Turn on the 50 MHz calibrator as explained in the last section. Set the
center frequency to 50 MHz. Set the span to 0 Hz.
3.
Connect A21J18 to a known good spectrum analyzer. Tune the spectrum
analyzer to 250 MHz. This port switches the 250 MHz IF that is input to the
A21 Wideband Analog IF to be routed to the A3J15 40 MHz Digital IF. If
this
−
23 dBm
±
3 dB signal is present, you have verified the 250 MHz IF
from the A15J901 Front End Controller. If this signal is not present, verify
the signal is present on A15J901 of the A15 Front End Controller.
Verify the 2400 MHz Frequency Reference
1.
Turn the instrument off.
2.
Remove the instrument cover. Refer to
in this service guide.
3.
Turn on the signal analyzer and wait for the instrument to complete the
boot up process.
4.
Press
System
,
Alignments
,
Auto Align
,
Off
.
5.
Press
Mode/Meas
,
IQ Analyzer
,
Complex Spectrum
,
OK
.
6.
Press
Input/Output
,
RF Calibrator
,
50 MHz
7.
Press
Meas Setup
,
IF Path
. Tap
IF Path
and choose
255 MHz
or
510 MHz
from the drop down menu.
8.
Verify the 50 MHz signal is at
−
25 dBm on the analyzer display by pressing
FREQ
,
50 MHz
,
SPAN
,
1 MHz
,
Peak Search
on the analyzer. The marker
readout should be 50 MHz at
−
25 dBm
±
3 dB. If this reference signal is
measuring incorrectly, see
Chapter 4, “RF Section Troubleshooting
in this service guide.
9.
Connect a known good spectrum analyzer to A21J3. Verify reference
signal at 2400 MHz at a level of
+
9 dBm.
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 ...