216 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
RF Assembly
A3 RF Assembly Troubleshooting
PULSE
This procedure will verify that the PULSE input is functioning properly. While
the use of this input may typically be thought of as a trigger for pulse
modulation, it can also be used without the pulse modulation option. Because
of this there are two procedures below for testing the functionality of this input;
one that will use the input to trigger the start of a sweep, and one that will use
it as an external pulse for pulse modulation if option UNW, Narrow Pulse
Modulation is installed.
Without Option UNW
This procedure assumes that the sweep function of the instrument is
functioning properly when using an internal trigger signal. If there is a problem
with the sweeping of the signal using an internal trigger, 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 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 the PULSE input by pressing EXT, Pulse.
12.Setup the function generator with the following settings:
— Function = Square Wave
— Frequency = 500 mHz
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