Instrument Test; Picture Size & Position; Screen Center; Luminance Test - ViewSonic vp231wb Service Manual

5.2.2 Instrument test.

5.2.2.1 Picture size & position.
5.2.2.1.1 Picture size.
Input analog timing 1 ~ 27mode & DVI timing 1 ~ 26 mode:
H-size: 495.36mm ± 1mm.
V-size: 309.6mm ± 1mm.
(Extra 640x350)

5.2.2.1.2 Screen center.

a. 1920x1200: H ± 1mm, V ± 1mm.
b. Others mode: H ± 1.5mm, V ± 1mm.
5.2.2.1.3 Picture position (refer to FIG.2).
H-position: ︱ g3-g4 ︱ ≦ 1.5mm.
V-position: ︱ g1-g2 ︱ ≦ 1.5mm.

5.2.2.2 Luminance test.

5.2.2.2.1 Input 1920x1200 / 60Hz & full white pattern at 100IRE, adjust brightness 100%, contrast 70%.
Color temperature
sRGB
9300K
6500K
5400K
5000K
5.2.2.2.2 Input 1920x1200 / 60Hz & full white pattern at 100IRE, adjust brightness 100%, contrast 100%.
Color temperature
9300K
6500K
5400K
5000K
5.2.2.3 Picture performance test.
5.2.2.3.1 Picture quality:
Test pattern signal
1 100IRE white raster pattern
2 Cross hatch pattern
3 Color bar
4 Gray scale (16 steps)
5 1dot ON / 1dot OFF pattern
6 40IRE gray raster
5.2.2.3.2 DVI performance test.
5.2.2.3.2.1 Test equipment:
5.2.2.3.2.2 Test condition:
ViewSonic Corporation
x
0.313 ± 0.01
0.283 ± 0.01
0.313 ± 0.01
0.335 ± 0.01
0.346 ± 0.01
Y (Luminance)
Analog
>220 nit
>220 nit
>220 nit
>220 nit
The following electric faults shall not be conspicuous
Seam, Noise, Beat, Flicker
Ringing, Over shoot, Smear, V-jitter, H-jitter
Color distortion, Noise, Beat, Color tangent
Noise, Beat, Gamma distortion
Noise, Flicker
Noise, Beat, Gamma distortion
a. VG828 digital pattern generator.
b. "TTL" DVI-D single link cable.
a. 1920x1200 75K / 60Hz reduce blank timing.
b. 16, 32, 64, 256 horizontal grays scales.
c. 16, 32, 64, 256 vertical grays scales.
g3
y
Analog
0.329 ± 0.01 >200 nit
0.298 ± 0.01 >150 nit
0.329 ± 0.01 >200 nit
0.350 ± 0.01 >180 nit
0.359 ± 0.01 >180 nit
DVI
>220 nit
>220 nit
>220 nit
>220 nit
Confidential - Do Not Copy
19
g1
g2
495.36mm
FIG. 2
Y (Luminance)
DVI
>200 nit
>150 nit
>200 nit
>180 nit
>180 nit
309.6mm
g4
VP231wb