Brightness - HP ESA-L1500A User's And Calibration Manual

Front-Panel Key Reference

Brightness

Brightness
The brightness of the display is controlled by two keys located next to
each other at the upper left-hand corner of the spectrum analyzer,
bordering the display. Twelve levels of brightness are provided; the top
key makes the display brighter, and the lower key darkens the display.
The lowest brightness level causes the display to be completely dark, as
if the instrument were switched off. If the display is completely dark,
press the top brightness button before troubleshooting the instrument.
The brightness keys do not automatically repeat when they are held
NOTE
down. To continue to increase or decrease the brightness, the
appropriate key must be pressed repeatedly.
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