Philips 201B40/74H Uživatelský manuál stáhnout pdf (Strana 37)

Glossary

a picture is set by the brightness of the unexcited phosphor, which is governed by the degree with

which ambient light is reflected. Contrast is therefore reduced in conditions of high ambient light

levels. Black Matrix tubes reflect less ambient light so exhibit higher contrast than other tubes.

Convergence error

Bean misalignment causing one or more of the three beams passing through the wrong aperture in

the shadow mask and striking a phosphor dot in the wrong triad.

Convergence error is expressed in mm often at three well-defined points on the screen, designated

A, B and C (see figure ). Also known as misconvergence.

Points where convergence error is specified

Convergence-error correction

A method of correcting for convergence error to insure that all three beams land simultaneously in

the same triad. This is usually accomplished by means of special convergence-error correction coils

in the deflection yoke.

CRT

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Philips 201B40/74H Uživatelský manuál Strana 37