Abstract: A cover assembly has a plurality of covers that are movable between an open and closed position to cover access openings in a base. The assembly includes a locking assembly for locking one or more of the covers in the closed position. The locking assembly includes a locking tab on the base that has two locking apertures. One locking aperture receives a lock to overlie a front face of each of the covers to prevent the covers from opening. A second locking aperture is oriented to mate with an aperture in a locking tab on one of the covers to lock the cover in a closed position while allowing the other cover to open independently of the other. In another embodiment, one cover has a flange that overlies at least a portion of the other cover so that locking one of covers prevents both covers from being opened.

Abstract: A cover assembly has a plurality of covers that are movable between an open and closed position to cover access openings in a base. The assembly includes a locking assembly for locking one or more of the covers in the closed position. The locking assembly includes a locking tab on the base that has two locking apertures. One locking aperture receives a lock to overlie a front face of each of the covers to prevent the covers from opening. A second locking aperture is oriented to mate with an aperture in a locking tab on one of the covers to lock the cover in a closed position while allowing the other cover to open independently of the other. In another embodiment, one cover has a flange that overlies at least a portion of the other cover so that locking one of covers prevents both covers from being opened.

Abstract: Apparatus for creating video test patterns for outputting to a video test pattern generator enables individual lines to be built from standard components with appropriate parameters. Completed lines are held in a form which is television standard-independent and can be edited numerically or graphically. A test pattern is built from a set of lines and a part or fully completed pattern can be displayed to an operator in a picture representation which simulates the appearance of the test pattern when displayed on a television receiver.