DESIGNER’S HANDBOOK 4189350049C EN
Page 184 of 206
When you now want the white screen to be more bluish, you push the
˄ front button to increase the blue colour.
Since blue colour is already at max 252 the red and green colours are both reduced one step for each push on the
˅ button, this will make the white screen turn bluer for each push.
Use the
˄ or ˅ button to find the best possible colour match between old and new screen.
If the blue colour has already been adjusted down to a value below 252, the “smart function” will first increase blue
to max level before it will start to reduce red and green level.
12.3.2.1
Max backlight adjustment
In some cases, it will also be necessary to reduce the max backlight level to make the new service unit match the
overall backlight level of the existing indicators.
To do this highlight this field:
Using front button
˄ or ˅
you can adjust the max backlight level and see the result immediately on the calibration
screen.
IMPORTANT:
By default, the max backlight of XDi 192 is set to 225 to reduce the aging that a high backlight level
tends to accelerate.
This small 10% reduction will reduce heat dissipation in the backlight LED’s with more than 50% !
This reduction is especially important if backlight is always at 100%, for example in an engine control room, where
we recommend to adjust the fixed dimmer level or max backlight to the minimum acceptable level.
12.4 Some experience
The few examples we have seen where the aging has changed display colour, it seems that the XDi 192 display
backlight LED’s ages toward blue colour and the XDi 96 backlight ages more towards red.
But with the “smart function” it is relatively easy to match either of the two situations following the procedure
described in the next chapter.
12.4.1
Save or undo your display calibration
When you have made the best possible match between the old and the new indicator displays, press the OK button
to move to the following menu screen:
Highlight and press OK on:
Cancel (default):
Then all changes you have made will be deleted and previous calibration values will be used.
