462 Keysight N9038A MXE Service Guide
Service and Diagnostics Menus
Service Key Descriptions
Corrections
This menu allows access to activate and deactivate specific amplitude
correction sets. With this capability, the technician can determine if an
anomaly is a result of raw hardware performance or incorrect correction data.
It also allows the technician the ability to measure the raw hardware
performance when all corrections are set to Off.
RF Flatness
This menu allows access to activate and deactivate the corrections unique
to the RF flatness of the instrument. RF Flatness corrections consist of two
major parts: raw flatness corrections and temperature corrections. These
corrections are summed together and applied by using RF gain, IF gain,
and/or “video shift” (post-digitized mathematical offset). The selections in
this menu allow the corrections to be applied or not applied to facilitate
troubleshooting the cause of flatness-related problems.
Flatness Video Shift On/Off
The Flatness Video Shift turns off the corrections for gain vs.
frequency. It does not turn off the corrections for changes in the
analog IF gain that accompany flatness changes. This function turns
both the gain and video shift on or off, but does not affect the
temperature corrections. When set to off, it is possible to measure
the raw flatness of the spectrum instrument while maintaining the
temperature corrections.
When Flatness Video Shift is OFF, the Advisory Event “Flatness Video
Shift OFF” will be displayed.
When Flatness Video Shift is ON, the Advisory Event “Flatness Video
Shift OFF” will be cleared.
Temperature Gain & Tilt On/Off
This function controls both temperature adjustment mechanisms:
overall gain vs. temperature, and the temperature-proportional tilt of
the gain vs. frequency.
When Temperature Gain & Tilt is OFF, the Advisory Event “Flatness
Temperature Gain & Tilt OFF” will be displayed.
When Temperature Gain & Tilt is ON, the Advisory Event “Flatness
Temperature Gain & Tilt OFF” will be cleared.
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