Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 201
RF Assembly
A3 RF Assembly Troubleshooting
3. Run the “Synthesizer Related Adjustments” listed later in this section.
4. If the failure persists, replace the A3 RF assembly.
Synthesizer unlocked
If there are any synthesizer unlocked errors see the “508 Synthesizer
Unlocked” section in Chapter 6, “Troubleshooting”
Self Tests
There are a series of Self Tests related directly to the Synthesizer section. They
are numbers 301 through 316. However, not all instruments use all the Self
Test in this range. 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 Synthesizer section Self Test failure
be sure to run the “Synthesizer 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”
Synthesizer Related Adjustments
There are seven Synthesizer section related adjustments in the performance
verification and adjustment software. However, not all instruments use all the
adjustments. They are:
1. Synthesizer Offset Pretune Calibration
This adjustment is only applicable for MXG instruments.
This adjustment is used to determine the optimal offset pretune DAC
setting for each offset loop frequency. This data is then used to pretune
the offset loop to ensure that it locks to the correct frequency.
2. Synthesizer Offset Kv Calibration
This adjustment is only applicable for MXG instruments.
This adjustment is used to determine tuning sensitivity of the Offset phase
lock loop.
3. Synthesizer Sum Pretune Calibration
This adjustment is used to determine the optimal sum pretune DAC setting
for the sum loop frequencies. This data is then used to pretune the sum
loop and minimize switching times.
4. Synthesizer Sum Attenuation Calibration
This adjustment is only applicable for MXG instruments.
This adjustment is used to determine the sum attenuator value required to
achieve the optimal power level to the RF input of the sum mixer for
different sum loop frequencies.
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