Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 223
RF Assembly
A3 RF Assembly Troubleshooting
Power Level Test
8. Reduce the power level of the additional source to -3 dBm and verify that
the EXTREF indicator is still on and that there is no reference unlock error
on the display.
9. Increase the power level of the additional source to +20 dBm (or as high as
it will go below this level) and verify that the EXTREF indicator is still on
and that there is no reference unlock error on the display.
10.If the EXTREF indicator does not come on, or there is a reference unlock
error when the power level is set within the limits, replace the A3 RF
assembly.
Frequency Test
11.Set the power level of the additional signal source to 0 dBm.
12.Tune the additional signal source to 1 MHz.
13.Change the external reference frequency to 1 MHz by pressing FREQ,
More, Reference Oscillator, Ref Oscillator Ext Freq, 1 MHz.
14.Clear the errors that occurred while the frequencies were being changed
by pressing Error, Clear Error Queue(s).
15.Verify that no errors return once they are cleared.
16.Verify that the EXTREF indicator is now on, as shown in Figure 10-12.
17.Repeat steps 12 to 16 for a frequency of 50 MHz as well as any other
frequency of interest between 1 MHz and 50 MHz.
18.If there are any unlock errors that do not clear when both the frequency
settings are the same, or the EXTREF indicator does no come on, replace
the A3 RF assembly.
Additionally, testing with any combination of power level and frequency used
can be performed as long as the limits of both do not exceed the limits used in
this testing.
10 MHz OUT
The rear panel 10 MHz OUT connector should always have a 10 MHz signal at
>+4 dBm. Use the following procedure to verify this.
1. Return the instrument to a known state by pressing Preset.
2. Connect the rear panel 10 MHz OUT connector to the input of a spectrum
analyzer.
3. Setup the spectrum analyzer with the following settings:
— Center frequency = 10 MHz
— Span = 1 MHz
— Reference level = +10 dBm
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