Manual Number 9019161
Revision A, September 9, 2020
24
4.5.1.2 DIMMING CURVE
The Dimming Curve feature allows the installer to customize the response to the Dimming
Control input, whether Internal or External, over its range of operation.
To do this, a desired brightness can be assigned for multiple points across the input range
to produce a unique dimming scheme that most closely matches the other instruments in the
panel and the pilot’s preferences. This feature is provided for maximum installation flexibility.
NOTE: When new, the display is daylight-visible at approximately 75% brightness. It may
not be necessary to set the dimming curve to 100%. Setting the high-brightness side of the
dimming curve to less than 100% will extend the life of the LED backlight and provide
margin to increase brightness in the future as needed.
The dimming curve is comprised of the following elements: (Figure 4.9)
•
X-axis: represents the input range from minimum to maximum (either external voltage or
ambient light, whichever is selected in Dimming Control).
•
Blue vertical line: represent the current Dimming Control input value
•
Y-axis: represents brightness of the display
•
Blue horizontal line: represent the current display brightness. The crossing of the two
blue lines will track along the dimming curve in real time as the input changes
•
Dimming Points: small squares that represent six adjustable values of brightness across
the input range. When selected and able to adjust, each point will turn green.
•
Dimming Point Value: the numeric value (0-100 percent) of each of the 6 (or 7) dimming
points are listed along the vertical axis for reference. Each one turns green as its
corresponding point is active.
•
White vertical line: For units with an External dimming control, a vertical white line is
provided as the minimum voltage threshold. When the input is below this value, the unit
will switch to photocell/Internal control and track a dimming curve along a straight line
from the minimum set point to the maximum set point. This is provided so that the unit
will default to a dim or bright setting appropriately if the dimming input goes too low, is
turned off, or fails open.
Internal Control
External Control
Figure 4.9 Dimming Curve
