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Page 5-10 GTX 330 Installation Manual
Revision G 190-00207-02
LVL (Level)
Shows the current level of key lighting, 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 999, but is not a user-entered field (display only).
RSP TIME (Response Time)
Sets the speed with which the brightness responds to ambient light changes (only for AUTO key lighting
mode). The higher the number, the slower the key lighting responds. This field has a range of 0 to 7, and
is set to 4 at the factory.
MIN (Minimum) (Auto Only)
Sets the minimum brightness of the key lighting. The higher the number, the brighter the minimum
brightness. Key lighting minimum brightness has a range of 0 (zero) to 99, and is set to 8 at the factory.
It is prudent to verify that key lighting characteristics match those of other equipment in the aircraft panel
under night lighting conditions.
KEY SRCE (Key Lighting Source) (Auto Only)
SELECTION DESCRIPTION
PHOTO (Photocell)
DEFAULT. Key lighting level is determined by the ambient light
level as measured by the photocell on the GTX 330.
14V
Backlight level tracks a 14 volt DC aircraft lighting bus.
28V
Backlight level tracks a 28 volt DC aircraft lighting bus.
5V
Backlight level tracks a 5 volt DC aircraft lighting bus.
SLOPE (Auto Only)
Sets the sensitivity of the key lighting brightness to changes in the input level. The higher the number,
the brighter the key lighting 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 (Auto Only)
Adjusts the key 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.