6.3. Straightness of Line Segment
For any segment of an edge of the active picture the deviation from being
straight is defined as the distance from the straight line formed by connecting
the end points of the segment under test to the point on the line segment
furthest from that construction.
Measurement: The deviation is to be measured perpendicular to the constructed line.
Requirements: For line segments less than 50 mm the maximum allowed deviation is 1 mm.
0 --- 50 mm
50 --- 200 mm
This must be valid for vertical and horizontal lines.
Linearity is defined as a relative change in character dimensions.
Measurement: 16 x 12 Cross---hatch test pattern. Brightness control is set so that the
background raster has just extinguished and the contrast control is set to
Requirements: For horizontal sync frequencies above 60 kHz:
The limits for vertical or horizontal non---linearity are 5 % between adjacent
squares and 8 % between any squares.
For horizontal frequencies below 60 kHz:
The limits for vertical or horizontal non---linearity are 8 % between adjacent
squares and 12 % between any squares.
The method of calculating linearity is: [(max---min)/max] x 100 < 8%
The measurement is done via the centre point of the rectangle from center
of the line to center of the line.
6.5. Phosphor Color Coordinates
Test pattern is full screen R,G or B field.
Brightness control is adjusted for a background raster luminance level of
cut off. Contrast control is adjusted to the maximum luminance level.
Input signals R,G or B with maximum amplitude.
Requirements: Phosphor CIE---coordinates
Tolerance of the color coordinates will be < 0.020 in both x and y direction.
deviation = a---b
% deviation= (a---b/l) x 100
max. dev. 1 mm
max. dev. 1.0 --- 2.0 mm
max dev. 2.0 mm