Barco OVERVIEW D 50" Installation Manual page 88

The dimmer will be positioned immediately after entering a new target value, and the related DIS value is
adjusted accordingly.
Due to the fact that the lamps show tolerances in burner position and arc length, multiple lamps with the
identical relative brightness value will show differences in emitted brightness. This can be checked by reading
out the value of the direct illumination sensor (DIS).
In relative mode, values can be entered in the range from 50 to 100 (50% to 100%).
To modify the light level:
•
Use the cursor keys to set the focus to the Value text field.
•
Press Enter to activate.
•
Use the left/right cursor key to decrease/increase the value, or set a new value by means of the numeric
keys on the Remote-Control unit.
Since it is the result of the measurement, the DIS value cannot be modified, it is read-only.
Set Brightness, Absolute (controlled mode)
It is recommended first to run DIS calibration, cf.
In this operation mode, the dimmer is positioned by the brightness control algorithm utilizing the readout level
of the direct illumination sensor DIS as feedback signal.
The control loop is triggered each time a new target value is entered. It also becomes active after change of
mode from relative to absolute. The control loop stops once the target value is reached within an accuracy limit
of ± 1%. Typically this takes about 10 sec.
The target value is in same units as the DIS value. If the DIS is calibrated to lux by appropriate setting of the DIS
calibration factor, then the target value is to be entered in lux.
If the dimmer fails to reach the target brightness because it is operated at it's upper or
lower limits an error message will show up.
OverView D 50" – DOC-3303-5 – installation manual – Revision 10 – September 2006
DIS Calibration Factor!
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8. Final Adjustment and Configuration
Dialog box Set Brightness, absolute mode activated
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Figure 8-25