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12. CAST User interface
After confirmation, the measurement result of the lux meter has to be entered into the following dialog.
Figure 12-39
Calibration of spectroscope
Click on Start to start the measurement with the spectrometer. Make sure that the spectrometer is hold on
approximately the same spot as the lux meter.
After the measurement, CAST displays the following message box:
Figure 12-40
Luminance calibration is completed
The date in the Calibrate spectrometer dialog will be updated.
Luminance calibration has no influence of quality when adjusting a Display Wall. The calibration is only used to
show a „true value“ on the Luminance tab in Projector | Projector properties.
The color calibration of the spectrometer is done in the optics lab and saved to a file. Each spectrometer has an
own calibration file which has to be loaded when installing the device, cf. Spectroscope. The spectrometer has to
be sent to the optics lab in regular intervals (1 year) for re-calibration. The updated calibration file then is loaded
by clicking on Load calibration on the hardware tab in Tools | Options.
There is no possibility to check whether a calibration file is still valid, or whether the spectrometer has to be recalibrated. However, if CAST refuses the result of a measurement (and there is no chance that the user caused a
measuring error) then it is quite likely that the spectrometer has to be sent to the optics lab to be re-calibrated.
When refusing a measuring result, CAST displays the following information:
Figure 12-41
CAST refuses to accept a value
Barco – CAST for OverView D series – DOC-3329-2 – user's manual – Revision 04 – December-2006 ___________________________________ 12-26