Garmin G1000 Manual page 90

cockpit. Simply covering the photocells may not allow the installer's eye to properly
judge whether the display brightness is too bright, or too dim, for night use.
Photocell Configuration:
1. It is recommended to start configuration with a linear lighting curve slope (45° Straight Line).
2. Minimize photocell input levels by simulating night conditions in the cockpit. Any other
instrument panel or cockpit lighting should be turned on for this adjustment. Seek uniform
consistency between display lighting, bezel/key lighting, and any other illuminated objects.
a) If a display/keypad is too bright, lower the minimum setting and/or adjust the lighting
curve to achieve the desired brightness.
b) If the display is not bright enough, raise the minimum setting to the desired
brightness.
c) In the case of the GMA, adjust gain and offset settings to achieve the desired
brightness relative to other lighting.
3. Simulate direct maximum sunlight in the cockpit (best if done outside).
a) Verify that the display produces maximum brightness on the graph.
4. Simulate average sunlight conditions in the cockpit (between ~50-75% input level).
a) If the display is too bright or too dim, use a combination of lighting curve changes to
achieve desired brightness at mid-range lighting input levels.
b) Ensure that the lighting curve and minimum setting still maintain the low-light
configuration achieved in Step 2. Repeat Step 2 if necessary to re-adjust night
lighting settings.
c) Adjust the response time to smooth changes to brightness as required.
Dimmer Bus Configuration:
1. Select the appropriate source voltage for the dimmer bus. Set the Photo Transition point to
0.0 for initial dimmer knob calibration.
2. Simulate night conditions in the cockpit. Turn the dimmer bus knob to its minimum setting
and observe the graph for corresponding change to the input level. Attempt to seek uniform
consistency between display lighting, bezel key lighting, and any other cockpit illuminated
information.
a) If a display/keypad is too bright, lower the minimum setting and/or adjust the lighting
curve to achieve the desired brightness.
b) If the display is too dim, increase the minimum setting to achieve desired levels.
c) In the case of the GMA, adjust gain and offset settings to achieve the desired
brightness relative to other lighting.
3. Simulate direct sunlight conditions in the cockpit. Turn the dimmer bus knob to its maximum
setting and observe the graph for a corresponding change to the input level.
a) If the brightness is below maximum on the graph, adjust the lighting curve settings to
achieve maximum brightness.
b) Check for smoothness in the transition from dark to light and adjust the lighting
curve and response time settings to achieve desired results.
If desired, set the photocell transition point and associated photo lighting curve to achieve desired display
performance over a variety of lighting conditions.
Page 3-48
Revision 1
G1000 V8.XX S/W Load and Post Install Checkout – Columbia 350/400
190-00577-04