BenQ PB8250 Service Manual page 10

center of the screen that is entirely the measured color under default brightness and contrast
settings.
A14. COLOR UNIFORMITY
Color Uniformity is the maximum color difference ( x, △ △ y) between any two points out of
L1~L13
A15. ANSI COLOR UNIFORMITY
ANSI Color Uniformity: △ u'v'= [(u'1 -u'0)^2+(v'1-v'0)^2]^1/2
(u'0,v'0): the average color of L1~L13
(u'1,v'1): the spot with maximum deviation from (u'0,v'0)
A16. PROJECTION OFFSET
Projection Offset= Image height above projection lens optical axis / Total image height x 100%
Note: Optical engine should be kept horizontal attitude
A17. BLUE EDGE INSPECTION CRITERIA
The blue edge must invisible with blue pattern 171 (R=50/255, G=100/255, B=255/255)
A18. DEFOCUS AND FLARE TEST PROCEDURE
Procedure:
Step 1: Get best focus at Screen Center with Pattern 1
Step 2: Check specified screen sizes and zoom positions
Step 3: Use Chart1 to measure Defocus and Flare for whole screen of R,G,B color at Pattern 2,3,4
and record the maximum number
Example of 1.5 pixel flare:
A19. LATERAL COLOR TEST PROCEDURE
Procedure:
Step 1: Get best focus at Screen Center with Pattern 1
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