Garmin GPS 400W Installation Manual

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Garmin GPS 400W Installation Manual Manual pdf 90 page image

Page 5-12 GNS 400W Series Installation ManualRev. G 190-00356-085.3.7 MAIN LIGHTING PageSelect the MAIN LIGHTING Page (see Figure 5-11). Thispage allows you to set display parameters that affect thedisplay backlight and key lighting brightness. TheDISPLAY and KEY lighting characteristics are adjustedseparately, each with the following fields:LIGHTINGShows the current level of display backlighting, based onthe lighting input source (lighting bus voltage, or theambient light if the source is PHOTO) and the settings onthis configuration page. This field has a range of 0 (zero) to 9999.SOURCESelection DescriptionPHOTO Backlight level is determined by the ambient light level as measured bythe 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 isset to 4 at the factory.MIN - (Minimum)Sets the minimum brightness of the display. The higher the number, the brighter the minimumbrightness. Display minimum brightness has a range of 35 to 999, and is set to 80 at the factory. Keyminimum brightness has a range of 20 to 99, and is set to 40 at the factory. It is prudent to verify thatdisplay and key lighting characteristics match those of other equipment in the panel under night lightingconditions.SLOPESets the sensitivity of the display brightness in proportion to changes in the input level. The higher thenumber, 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.OFFSETAdjusts 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 inthe panel.Figure 5-11. MAIN LIGHTING Page