Garmin GPS 400W, Installation Manual

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Page 5-12 GNS 400W Series Installation Manual
Rev. G 190-00356-08
5.3.7 MAIN LIGHTING Page
Select the MAIN LIGHTING Page (see Figure 5-11). This
page allows you to set display parameters that affect the
display backlight and key lighting brightness. The
DISPLAY and KEY lighting characteristics are adjusted
separately, each with the following fields:
LIGHTING
Shows the current level of display backlighting, based on
the lighting input source (lighting bus voltage, or the
ambient light if the source is
PHOTO ) and the settings on
this configuration page. This field has a range of 0 (zero) to 9999.
SOURCE
Selection Description
PHOTO
Backlight level is determined by the ambient light level as measured by
the photocell on the 400W Series unit.
14V DC Backlight level tracks a 14 volt DC aircraft lighting bus.
28V DC Backlight level tracks a 28 volt DC aircraft lighting bus.
5V DC Backlight level tracks a 5 volt DC aircraft lighting bus.
5V AC Backlight level tracks a 5 volt AC aircraft lighting bus.
RESP TIME - (Response Time)
Sets the speed with which the brightness responds to the input level (bus voltage or ambient light)
changes. The higher the number the slower the display responds. This field has a range of 3 to 7, and is
set to 4 at the factory.
MIN - (Minimum)
Sets the minimum brightness of the display. The higher the number, the brighter the minimum
brightness. Display minimum brightness has a range of 35 to 999, and is set to 80 at the factory. Key
minimum brightness has a range of 20 to 99, and is set to 40 at the factory. It is prudent to verify that
display and key lighting characteristics match those of other equipment in the panel under night lighting
conditions.
SLOPE
Sets the sensitivity of the display brightness in proportion to changes in the input level. The higher the
number, the brighter the display is for a given increase in the input level. This field has a range of 0
(zero) to 99, and is set to 50 at the factory.
OFFSET
Adjusts the lighting level up or down for any given input level. This field has a range of 0 (zero) to 99,
and is set to 50 at the factory. This may also be used to match lighting curves with other equipment in
the panel.
Figure 5-11. MAIN LIGHTING Page