200 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
RF Assembly
A3 RF Assembly Troubleshooting
3. If the instrument has option 1ER, flexible reference input, verify that the
FREQ, More, Reference Oscillator, Ref Oscillator Ext Freq setting is set to
10 MHz.
4. If the unlock persists, replace the A3 RF assembly.
Self Tests
There are a series of Self Tests related directly to the Reference section. They
are the 200 series tests. See Chapter 4, “Self Test,” for a description of each of
the tests. If there are Self Test failures, see Table 4-1 for instructions on how to
proceed with determining a resolution for the failure.
Before replacing an A3 RF assembly for a Reference section Self Test failure be
sure to run the “Reference Related Adjustments” listed later in this section.
Also, be sure to verify the power supply voltages by seeing the “Power Supply
Status Quick-Check” section in Chapter 8, “Power Supply”
Reference Related Adjustments
There are three Reference section related adjustments in the performance
verification and adjustment software. They are:
1. Reference VCO Tank DAC Calibration
This adjustment is used to determine the range at which the 100 MHz tank
circuit will operate, and then find the DAC value that provides the peak
power level from the oscillator.
2. Reference Internal Standard Calibration
This adjustment will tune the internal 10 MHz reference to deliver the
most accurate reference frequency to the instrument.
3. Reference VCO Kv Calibration
This adjustment is used to determine the tuning sensitivity of the internal
reference oscillator.
Synthesizer Section
There are no ports that can be used to make a direct measurement of any of
the Synthesizer section signals. The main indicator of a problem with the
Synthesizer section will be the presence of a Synthesizer Unlock error
message.
If there is a problem with the Synthesizer section of any sort, including the
failing of a Self Test or a performance verification test, do the following:
1. Verify the power supply voltages by seeing the “Power Supply Status
Quick-Check” section in Chapter 8, “Power Supply”
2. Verify that the instrument is using the factory calibration data by restoring
the data. See “Calibration Data Restore” in Chapter 3, “Instrument
Information and Calibration Data”
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