A-A-1608B
Shall be of the following styles, as specified:
Style A- Front screen projection.
Style B- Rear screen projection.
Salient characteristics.
General. Shall be designed specifically for desk top or table use.
Unacceptable features. Portable readers characterized by features such as light weight, handles for transporting, battery operation, collapsible design, integral or separate carrying case, etc.
Lens interchangeability. Lens shall be operator interchangeable and easily installed.
Replacement lamp. Lamp shall be easily accessible and replaceable without the use of special tools.
Electrical characteristics. Machine shall operate on 120 volts, 60 Hz.
Lamp. Rated average life of the lamp shall be not less than 500 hours.
Power cord. The power cord shall be at least 1.0 meters (6 feet long).
Frame format.
Lens magnification of 24x, the reader shall display no less than one frame of 98 frame format, with no cropped images,
Lens magnification of 30.5X, 31X, 31.5X, 32X, 33X; 35X, 36X, 37X are all acceptable provided the projected image is confined within available screen area and 48X; the reader shall display no less than one frame of 208/270 frame format.
Lens magnification of 42X, the reader shall display no less than one frame of 210 format.
Image rotation. 360 degree image rotation shall be available, as specified:
1) by carrier on single lens unit.
2) by carrier on dual lens unit.
3) on low magnification lens.
4) on high magnification lens.
5) on both high and low magnification lenses of the same unit.
Light shield. Front screen readers shall have light-absorbing black on all non-optical surfaces surrounding the screen. Rear screen shall have a fixed or detachable ambient light shield.
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