Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 217
RF Assembly
A3 RF Assembly Troubleshooting
— Amplitude = 1 Vpp
— Offset = 0.5 V
13.Connect the function generator output to the rear panel PULSE input
connector.
14.Turn the sweep on by pressing SWEEP, Sweep, Freq On.
15.At this point the signal on the spectrum analyzer display should be
sweeping across the frequency range every two seconds.
16.If the signal is not sweeping across the spectrum analyzer display replace
the A3 RF assembly.
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
Mod On/Off so that the LEDs below them come on.
3. Connect the source RF output to the input of a spectrum analyzer.
4. Setup the spectrum analyzer with the following settings:
— Center frequency = 1 GHz
— Span = 0 Hz
— Sweep Time = 2 ms
— Reference level = 0 dBm
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
at -10 dBm.
8. Set the pulse modulation source to external by pressing Pulse, Pulse
Source, More, EXT Pulse.
9. Setup the function generator with the following settings:
— Function = Square Wave
— Duty Cycle = 20%
— Frequency = 1 kHz
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