Avidyne IFD540 Installation Manual page 92

Field
Bezel
Display
Mx Input
Dimming Bus Calibration
The section will calibrate the IFD5XX to the aircraft avionics lighting bus.
Selection
dimBus Type
dimBus Max Voltage
dimBus Min Voltage
To calibrate the dimming bus:
1. Select desired dimBus Type;
2. Select the dimBus Max Voltage field;
3. Push the right bezel knob;
4. Set the dimming bus to the maximum value (e.g. full clockwise position on dimming
rheostat);
5. Push the right bezel knob to store;
Repeat the process for the minimum value (use full counter-clockwise position of rheostat)
600-00299-000
Value displayed represents the current % brightness of the
bezel backlighting
Value displayed represents the current % brightness of the
display backlighting
Photocell – Maintenance Mode will use this method if
selected. This is the default setting. This setting uses the
Photocell on the IFD5XX bezel or display.
dimBus – Maintenance Mode will use this method if
selected. This setting uses the aircraft lighting buss to
control the lightning of the bezel or display.
Table 71: Lighting Bus Configuration
Description
DC – select this option if the dimming bus is a DC bus.
AC – select this option if the dimming bus is an AC bus.
The IFD needs to know the bus type in order to alter
internal configuration as well as properly perform the
calibration.
Sets the maximum aircraft dimming bus voltage. Range is
0 – 28V.
Sets the minimum aircraft dimming bus voltage. Range is
0 – 28V.
Table 72: Lighting Bus Configuration
Page 92 of 198
IFD5XX Installation Manual
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Revision: 02