BenQ PB8220 - XGA DLP Projector, Service Manual

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Appendix A Optical Measurement
1.Scope:
This document describes critical optical related test definitions and Instructions for data or video
projectors. The other general terminologies are specified in ANSI IT7.228-1997.
2.General Requirements
1. The unit under test should be allowed to stabilize without further
adjustment for a minimum of 5 minutes , at nominal ambient room
temperature of 25
°
C, before making measurements.
2. Measurements shall take place in a light proof room, where the
only source of illumination is the projector. Less than 1 lux of the
light on the screen shall be from any source other than the
projector.
3. All measurements shall be made on flat screens that do not provide
any advantage to the performance of the unit
4. All measurements shall be made at standard color temperature
setting, 100% white image (per ANSI IT7.228-1997), except where
noted
3.Practical Requirements
1. When measuring contrast manually, operators should not wear white clothing since
light reflected from white clothing can influence the measurement.
2. Unless otherwise specified, the projection lens is set in the widest zoom position since
zoom function can influence the measurement.
3.
Measurement should be performed with Minolta Chromameter, Model CL-100, or
equivalent.
A1. ANSI BRIGHTNESS
ANSI Lumens = (L1+L2+L3+L4+L5+L6+L7+L8+L9)/9 (lux) x A(m^2)
A (Area) = W * H (m^2)
W: width of projected image (m)
H: height of projected image (m)
L 1 1
L 1 3
L 1 2
L 1 0
L 1
L 2
L 4
L 7
L 5
L 8
L 9
L 3
L 6
Note: L10, L11, L12, L13 are located at 10% of the distance from corner itself to L5
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