adjustment of the black level setting after calibration invalidates the process. In use, the black level controls may either be locked or accessible to the user. If they are accessible, they must have a detent type of setting where it is properly setup so that the user can find that position again after the control has been moved. This will ensure that the proper colour settings can be maintained. The process for correctly setting the controls is as follows with the monitor in a darkroom, and with the monitor turned on and warmed up to the manufacturer's specification, drive the monitor with a black signal (0, 0, 0). Measure the Luminance of this area. It should be less than 0.52 candelas per square metre (cd/m²). Lock the appropriate controls for the calibration process. The controls should be adjusted to achieve maximum required output level at full white signal. Using the photometer and a peak white signal, (DAC values of 255, 255,
255) adjust the controls fora luminance of at least 80 cd/m² (note that depending on the characteristics of monitor you may need 85 cd/m² or even higher values to get all colours inside the reproducible range. Lock appropriate controls for the duration of the calibration. (Note that the controls maybe available for the mariner's adjustment during use of the ECDIS system) At this point, the monitor is setup and ready for calibration.
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