Sencore VP300 manual Regulate, Checker, Ansi Gray

Regulate

Pattern Description: A single pixel white border surrounds an interior picture area which alternates between full white and full black.

Pattern Usage: Checks the regulation of CRT high-voltage and deflection power supply circuits. The pattern alternately produces maximum and minimum CRT beam current. Ideally, these current extremes should not cause the picture size to change. This can be judged by placing a thumbnail next to one of the border lines to see the amount of displacement (avoids optical effects from the alternating pattern). A one to two pixel shift is not noticeable in most picture material to a typical viewer.

Checker

Pattern Description: Alternating picture areas of black and white in a checkerboard pattern.

Pattern Usage: Checks the regulation of CRT video drive power supply circuits. The pattern produces abrupt, maximum changes in CRT video drive current. Ideally, this should not cause the voltage supplied to the video drive circuits to change (good voltage regulation). If the power supply does not have good regulation, it will cause softening or ringing of the vertical line pattern transitions.

ANSI Gray

Page 15