94 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Self Test
Troubleshooting Self Test 1105
Troubleshooting Self Test 1105
A self test 1105 failure can be caused by the A3 RF assembly or the A7 Micro
Deck. The following procedure will help identify the defective assembly.
1. After running a complete self test, where self test 1105 failed, press View
Test Info.
2. Scroll to self test 1304.
3. Press View Details.
a.If multiple lower level 1304 self tests failed, replace the A3 RF
assembly.
b.If only 1304 lower level self test 3.199 GHz Delta H/LB Detector
failed, continue to step 4.
4. Disconnect W20 from J2002 of the A3 RF assembly.
5. Connect A3 J2002 output to a spectrum analyzer.
6. Set up the spectrum analyzer:
a.Press Preset.
b.Set the reference level to +20 dBm.
c.Set the center frequency to 100 MHz.
d.Set the span to 100 MHz.
7. Set up the signal generator:
a.Press Preset.
b.Press Freq. Set the frequency to 100 MHz.
c.Press RF On/Off to On.
d.Press AMPTD and set to +10 dBm.
e.Press AMPTD and verify that ALC is set to On.
8. The spectrum analyzer should be displaying a CW signal with an
amplitude equal to the signal generator setting
±3 dB.
a.If the signal generator’s output level is significantly different than the
typical 2 or 3 dB, replace the A3 RF assembly.
b. If the signal generator’s output level is as expected, continue to
step 9.
9. Repeat step 6 through step 8, but change the spectrum analyzer’s and the
signal generator’s frequencies to 1 GHz and then 1.5 GHz.
—If the power level is as expected at all test frequencies, replace the A7
Micro Deck.
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