Figure 8-4. Fourth quadrant.
8-4.
EVALUATION AND INTERPRETATION
a. Determine the average illumination level for each viewbox (all readings
should be the same).
b. Do not accept a variation of illumination between individual quadrants if it
exceeds:
(1)
Ten percent.
(2)
Fifteen percent in five groups of viewboxes.
(3)
Twenty percent in group-to-group variations.
8-5.
PREVENTIVE MAINTENANCE
a. Replace illuminator lamps:
(1)
Every year if used 8 hours per day.
(2)
More frequently if used more than 8 hours per day.
MD0062
8-5