472 Keysight N9038A MXE Service Guide
Service and Diagnostics Menus
Service Key Descriptions
Calibrator
This menu allows access to the different internal calibrator signals used to
align the RF preselector filter shapes and balance the amplitude levels.
DDS Freq
Turns on the DDS (Direct Digital Synthesizer) calibration signal. This
calibrator signal is used by the 20 Hz to 30 MHz RF Preselector
alignment when balancing the signal levels through the different filter
paths of the A24 Conducted Filter assembly.
Once this calibrator signal is selected the frequency of the signal can
be set from 20 Hz to 60 MHz.
Noise Source
The Noise Source provides a broadband noise signal from 10 MHz to
4 GHz. This is used to align the tunable filters of the A22 Radiated
Filter assembly when a filter Characterization is run. It is also used
when a 30 MHz to 3.6 GHz RF Preselector alignment is run.
Off
Turns off whatever calibrator source might be turned on
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