220 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
RF Assembly
A3 RF Assembly Troubleshooting
20.If the signal is not sweeping across the spectrum analyzer display replace
the A3 RF assembly.
Output
This procedure will require the use of an oscilloscope.
1. Return the instrument to a known state by pressing Preset.
2. Connect the rear panel TRIG 1 connector to channel 1 of an oscilloscope.
3. Connect the rear panel TRIG 2 connector to channel 2 of an oscilloscope.
4. Setup the oscilloscope with the following settings:
— All channel volts per division = 2 V
Horizontal Scale per division = 10 ms
5. Set the sweep start frequency to 100 MHz by pressing SWEEP, Configure
Step Sweep, Freq Start, 100 MHz.
6. Set the sweep stop frequency to 200 MHz by pressing Freq Stop,
200 MHz.
7. Set the number of sweep points to 10 by pressing # Points, 10, Enter.
8. Configure the BNC connector routing by pressing SWEEP, More, More,
Route Connectors & Set Polarity:
— Route to Trig 1 BNC, More, Sweep Run
— Route to Trig 2 BNC, Sweep Trig Out
9. Turn the step sweep on by pressing Sweep, Sweep, Freq On.
10.Channel 1 on the oscilloscope display should now be a positive pulse with
a width of approximately 65 ms, and channel 2 should be a series of ten
pulses within the length of the channel 1 pulse, as shown in Figure 10-11.
If option UNZ, Fast Switching, is installed the oscilloscope horizontal
scale can be set to 5 ms per division and the channel 1 pulse width
should only be approximately 25 ms.
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