234 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Micro-Deck Assembly
A7 Micro-Deck Assembly Troubleshooting
Amplitude Modulation
If there are any amplitude modulation issues, see “Amplitude Modulation
Issues (Option UNT)” in Chapter 6, “Troubleshooting”
Pulse Modulation
If there are any pulse modulation issues, see “Pulse Modulation Issues (Option
UNW)” in Chapter 6, “Troubleshooting”
Self Tests
There is a series of Self Tests related directly to the A7 Micro-Deck assembly.
They are the 1100, 1200, 1300, and 1400 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 A7 Micro-Deck assembly for a Self Test failure be sure to
run the “A7 Micro-Deck 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”
A7 Micro-Deck Related Adjustments
1. MW ABUS Calibration
This adjustment is used to calibrate the internal diagnostics measuring
ADC.
2. MW Multiplier Prelevel Calibration
This adjustment is used to determine the optimal power out of the A7A2
20 GHz Frequency Multiplier. If the power is too low, it will impact the
ability of the system to deliver enough output power. If the power is too
high, it will increase the harmonic content of the output.
3. MW Linearity Calibration
This adjustment is used to linearize the ALC detector for the best power
accuracy.
4. MW Low Band Absolute Power Calibration
This adjustment measures the absolute power at the mid-point of the ALC
vernier and generates a cross calibration file for the ALC calibration and
attenuator calibration. This adjustment also calibrates the first two
attenuator steps (bypass, 0 dB and 5 dB), covering the frequency range of
9 kHz to 50 MHz.
5. MW High Band Absolute Power Calibration
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