194 Chapter 11
Service and Diagnostics Menus
Service Key Descriptions
Corrections
The Corrections menu allows the technician 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
Displays a menu which allows the technician to activate and deactivate the
corrections unique to the RF flatness of the analyzer. 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 analyzer 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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