Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 221
RF Assembly
A3 RF Assembly Troubleshooting
Figure 10-11 TRIG 1 and Trig 2 Sweep Out Signals
11.If either of the signals on the oscilloscope is not working, replace the A3
RF assembly.
REF IN
The standard external reference that can be used to lock the instrument to an
external device or system is a 10 MHz sinewave signal with a power level of
-3.5 to +20 dBm. However, with option 1ER, Flexible Reference Input, the
frequency of the reference input signal can vary from 1 MHz to 50 MHz. So,
there are two procedures for verifying the functionality of this input.
Standard
To verify the functionality of the standard 10 MHz external reference input, use
the following procedure. This procedure will require the use of an additional
signal source that will be used as a reference frequency that can be varied in
power.
1. Return the instrument to a known state by pressing Preset.
2. Set the instrument frequency reference selection to auto by pressing
FREQ, More, Reference Oscillator, Ref Oscillator Source, Auto.
3. Verify that the EXTREF indicator (Shown in Figure 10-12) is not on.
4. Tune the additional signal source to 10 MHz.
5. Set the power level of the additional source to 0 dBm.
6. Connect the output of the additional signal source to the rear panel REF IN
connector.
7. Verify that the EXTREF indicator is now on, as shown in Figure 10-12.
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