Acer H236HL Acer H236HL Monitor Service Guide - Page 16

14 Contrast ratio = Surface luminance with all white pixels Surface luminance with all black pixels 1.5.3 Response time: Response time is the time required for the display to transition from black to white (Decay Time, TrD) and from white to black (Rise Time, TrR) The sampling rate is 2,500 sample/sec. For additional information see FIG. 9. The response time is defined as the following figure and shall be measured by switching the input signal for each gray to gray. 1.5.4 Viewing angles: Viewing angle is the angle at which the contrast ratio is greater than 10 or 5. The angles are determined for the horizontal or x axis and the vertical or y axis with respect to the z axis which is normal to the LCD surface. For more information see FIG. 8. 1.6 Environmental Requirements: Temperature: Humidity: Altitude: Operating 0°C - +40°C 15% - 90% 12,000 feet (3,658m) Storage -20°C - +60°C 15% - 90% 40,000 feet (12,192m)