Acer AL1703 AL1703 Service Guide - Page 11
Photometer, TOPCON BM-5A, LCD Module, LCD Panel, Center of the Screen
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(4) Measurement Setup: The LCD module should be stabilized at given temperature for 20 minutes to avoid abrupt temperature change during measuring. In order to stabilize the luminance, the measurement should be executed after lighting Backlight for 20 minutes in a windless room. LCD Module LCD Panel Center of the Screen Photometer (TOPCON BM-5A) Field of View = 2 º 500 mm Light Shield Room (Ambient Luminance < 2 lux) 11