Keysight Technologies X Series Service Manual page 217

RF Assembly
A3 RF Assembly Troubleshooting
13.Connect the function generator output to the rear panel PULSE input
14.Turn the sweep on by pressing SWEEP, Sweep, Freq On.
15.At this point the signal on the spectrum analyzer display should be
16.If the signal is not sweeping across the spectrum analyzer display replace
With Option UNW
This procedure assumes that the pulse modulation function of the instrument
is functioning properly when using the internally generated pulse source. If
there is a problem with pulse modulation when using an internal source,
resolve that issue before proceeding with this procedure.
This procedure will require the use of a function generator and a spectrum
analyzer.
1. Return the instrument to a known state by pressing Preset.
2. Turn both the output power and modulation on by pressing RF On/Off and
3. Connect the source RF output to the input of a spectrum analyzer.
4. Setup the spectrum analyzer with the following settings:
5. Tune the source frequency to 1 GHz by pressing FREQ, 1 GHz.
6. Set the source power level to -10 dBm by pressing AMPTD, -10 dBm.
7. At this point there should a flat line across the spectrum analyzer display
8. Set the pulse modulation source to external by pressing Pulse, Pulse
9. Setup the function generator with the following settings:
Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
— Amplitude = 1 Vpp
— Offset = 0.5 V
connector.
sweeping across the frequency range every two seconds.
the A3 RF assembly.
Mod On/Off so that the LEDs below them come on.
— Center frequency = 1 GHz
— Span = 0 Hz
— Sweep Time = 2 ms
— Reference level = 0 dBm
at -10 dBm.
Source, More, EXT Pulse.
— Function = Square Wave
— Duty Cycle = 20%
— Frequency = 1 kHz
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