Cypress CPA-3 User Manual download pdf (Page 7)

Purity

Purity Color White,

Blue, Red,

Magenta, Green,

Cyan, Yellow, Black

Application

The red and green patterns are most frequently used for checking color purity.

In a correctly adjusted receiver, each electron beam will strike only one set of

color dots or stripes on the screen. If the red pattern is selected only this color

should be visible; the presence of any other color is an indication that color

purity needs adjustment.

The green pattern provides a purity check for three in-line tubes. In addition

the pattern serves as a reference to locate any geometrical distortions in

these picture tubes. In the in-line tubes, the guns are in a horizontal position

and the green gun is located in the center.

Blue as well as the complementary colors are often used to check the color

performance.

The Patterns (mainly RED) are used to ensure that there is no interference

between the sound and chroma carrier.

In addition to the primary and complementary colors 100% white can be

selected as well as black pattern with color burst to check.

Furthermore purity patterns are used for measuring unwanted amplitude and

phase modulation of the subcarrier, AM and PM noise as it occurs with VCRs.

Black / White Line

H/V B/W line

Application

The vertical pattern serves for a quick check of color monitor

’

s horizontal

bandwidth and phase behavior of a video transmission. Also, verify video am-

plier and color temperature.

The horizontal pattern serves for a quick check of color monitor

’

s vertical

bandwidth and phase behavior of a video transmission. Also, verify video am-

plier and color temperature.

WHITE BLACK

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Cypress CPA-3 User Manual Page 7