6.9 Centering drift across operating temperature
Horizontal maximum ：4mm
Vertical maximum ：4mm
6.10 Size control range
Horizontal ：Max ≧ 400, Min ≦ 350mm
Vertical ：Max ≧ 300, Min ≦ 260mm
6.11 Turn off spot
No persistent spot when turn off the monitor.
6.12 Color Tracking
When the 20% window block pattern is displayed at preset color condition, the difference of white balance between
contrast max. and low contrast (10FL) must be less than following value:
∣x (at 30FL) - x (at 10FL)∣≦0.015
∣y (at 30FL) - y (at 10FL)∣≦0.015
6.13 Contrast control range
Set brightness control to raster just cut-off, adjust contrast control from minimum to maximum.
The control range must be ：No less than 12db.
Calculated by the formula = 20 log
luminance Min.
luminance Max.
6.14 Video Amplifier response
a. Rise / Fall time ：Less than 7ns
b. Over shoot ：10% max., first over shoot
Note： Video rise / Fall times are measured at the cathode and actual achieved value calculated
using the following formula：
RT =
2222
SR-PR - GR - RM
Where, RT = Specified rise time
RM = Measured rise time
GR = Generator rise time
PR = Probe rise time
SR = Scope rise time
6.15 Focus
With the active video adjusted with a screen brightness of 25FL at center. (full white pattern measured at center)
The focus through out the screen shall be such that all dots and characters of each screen field are individually
distinguishable.
6.16 Misconvergence
Zone A ：0.25mm
Zone B ：0.35mm
The zone area are defined as follows：
Zone A ：The circle of diameter equals to the active video height.
Zone B ：Active display area except Zone A.
6.17 Purity
No perceptible hue variation over the entire visible area when checked with 20FL full white pattern and relative
luminance of full red, green and blue pattern.
ViewSonic Corporation
10
Confidential – Do Not Copy
G220f-1_G220fB-1
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