202 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
RF Assembly
A3 RF Assembly Troubleshooting
5. Synthesizer Sum Kv Calibration
This adjustment is used to determine tuning sensitivity of the sum phase
lock loop.
6. Synthesizer FracN Kv Calibration
This adjustment is only applicable for MXG instruments.
This adjustment is used to determine tuning sensitivity of the FracN phase
lock loop.
7. Synthesizer FM (Bessel) Calibration – (Option UNT)
This adjustment calibrates the out-of-band FM gain. For MXGs, this
involves both the FracN and sum loops. For CXGs and EXGs, this only
involves the sum loop.
Synthesizer Multiplier / Divider Section
There is one output port that can be measured from this section, but only for
certain instrument models. Since the output of this section can go to other
assemblies in addition to going to the RF Output section for certain instrument
models, measuring the output is something that will need to be done to isolate
certain signal level issues. To do this follow the procedure for the models listed
below.
N5171B, B5181B
For these instruments there is no additional output of this section that can be
measured.
N5166B, N5172B, N5182B
The output of this section can be measured at J2004, which is used to route
the signal to the A2 Vector BBG assembly input when digital modulation is
turned on. Use the following procedure to measure this output:
1. Return the instrument to a known state by pressing Preset.
2. Turn the modulation on by pressing Mod On/Off so that the LED below it
comes on.
3. Referring to Figure 10-3, remove semi-rigid cable W7.
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