Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 219
RF Assembly
A3 RF Assembly Troubleshooting
2. Turn the output power on by pressing RF On/Off so that the LED below it
comes 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 = 150 MHz
— Span = 100 MHz
— Reference level = 0 dBm
5. Tune the source frequency to 150 MHz by pressing FREQ, 150 MHz.
6. Set the source power level to -10 dBm by pressing AMPTD, -10 dBm.
7. At this point there should a signal at the center of the spectrum analyzer
display at -10 dBm.
8. Set the sweep start frequency to 100 MHz by pressing SWEEP, Configure
Step Sweep, Freq Start, 100 MHz.
9. Set the sweep stop frequency to 200 MHz by pressing Freq Stop,
200 MHz.
10.Set the trigger type to trigger and run by pressing SWEEP, More, Sweep
Trigger, Trigger Type, Trigger and Run.
11.Set the trigger to external and the TRIG 1 input by pressing EXT, Trigger 1.
12.Setup the function generator with the following settings:
— Function = Square Wave
— Frequency = 500 mHz
— Amplitude = 1 Vpp
— Offset = 0.5 V
13.Connect the function generator output to the rear panel TRIG 1 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.
17.Set the trigger to the TRIG 2 input by pressing
SWEEP, More, Sweep
Trigger, EXT, Trigger 2.
18.Move the function generator output from the TRIG 1 rear panel connector
to TRIG 2.
19.The signal on the spectrum analyzer display should again be sweeping
across the frequency range every two seconds.
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