A-A-2560 Copying Machine, Indirect Electrostatic Process (Portable; Plain Paper)This description covers two types of portable copies, one having a carring case and the other having either a handle of carrying case.

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A-A-2560

Test Procedure I. The copiers shall be installed in accordance with the manufacturer’s normal commercial practice. Copies shall be made in accordance with the following procedure:

1. Turn on and warm up the machine.

2. Place the resolution test target (Figure I) in position for reproduction.

3. Set the darkness/lightness control per the manufacturer’s operating instructions. . If no instructions are provided, the control shall be set at the middle of its range.

4. Make three (3) runs of five (5) copies each.

5. Remove the 5th, 10th, and 15th copies for evaluation.

6. Repeat steps 2 through 5 using the IEEE Test Chart

(Figure II).

Evaluation:

Resolution. Using a magnifier between 5X and 10X, determine the smallest line pair target in each target set which can be resolved. The line pair target is considered resolved when the lines (and spaces) are visibly separate. The resolution of the copiers shall be the lowest resolution value obtained from the 15 target sets on the three copies removed for evaluation.

Half-tones. Each of the three copies removed for evaluation shall be visually examined to determine that at least two distinct shades of gray are visible in both patterns 7 and 8 of the Test Chart. The white background shall not be considered a shade; the darkest step shall be considered a shade.

Blackness. The copies used for the half-tone evaluation also shall be visually examined to determine blackness of solid areas and whiteness of the background. Using a standard gray scale such as a “Munsell Neutral Value Scale”, the observer shall visually compare patterns 7 and 8 on each copy to the gray scale. The observer shall determine the reflectance of the background by determining the reflectance of the first step of pattern 7 and the 15th step of pattern 8.

All six (6) dark area reflectance determinations shall comply with the reflectance requirement for the solid darkest area on the copy.

All six (6) background reflectance determinations shall comply with the reflectance requirement for the background area of the copy.