NEC GammaCompMD QA Manuel d'utilisateur télécharger pdf (Page 74)

GammaCompMD QA Client User Manual

Retrieve both factory preset values from the display

The initial factory shipment value of the Diffuse Reflection

coefficient is transferred from the display. The reflected luminance

value is then calculated using the Illuminance value measured by

the ambient light sensor of the display. The formula is:

Reflected luminance = Illuminance x Diffuse Reflection coefficient

Example: 0.04 cd/m

= 20 lux x 0.002 cd/m

per lux.

When using MD215MG, MD211G5, MD212G3 or MD302C6, this

function is disabled.

Measure and calculate

The illumination is measured automatically and the reflected

luminance value will be calculated.

When using MD215MG, MD211G5, MD212G3 or MD302C6, this

function is enabled.

IMPORTANT NOTES:

・ It is very important to keep the ambient light conditions during this adjustment

process and during any calibration process on the same level.

・ Be very careful and do not change ambient light conditions drastically around the

display during a calibration process. Otherwise an incorrect diffuse reflection

coefficient will be stored in the display and the Ambient Light Compensation

function will not work correctly.

・ The Diffuse Reflection coefficient typically ranges from 0.002 to 0.006 cd/m2 per lux

and highly depends on the type of anti-reflection treatment applied on the screen

surface. Changes may happen over time due to aging and/or poor surface treatment.

・ For a newly installed display you may use the function Retrieve both factory preset

values from the display to adjust the Ambient Light Compensation in the display

correctly. If this action reports unreasonably high Reflected Luminance values, use the

“Manually adjust the Reflected Luminance value” function in addition.

・ Please use the function “Manually adjust the Reflected Luminance value” with

utmost care. For a realistic Reflected luminance value in the actual installation

environment, a calibratable luminance meter (“telescopic type” or “distance

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NEC GammaCompMD QA Manuel d'utilisateur Page 74