Downloaded from https://www.everyspec.com MIL-STD-81OC 2.2.1 =. Tests which are conducted for of materials, as well as heat buildup within the following acceptable radiation sources: degradation and deterioration the test item, may use one of a. Mercury vapor lamps (internalreflector type only) b. Combination of incandescent spot lamps (includinginfrared filters) together with tubular type mercury vapor lamps with external reflectors c. Combination of incandescentspot lamps (includinginfrared filters) together with mercury vapor lamps with internal reflectors d. Carbon arc lamps with suitable reflectors e. Mercury xenon arc lamps with suitable reflectors f.
Mercury vapor and lUCOIUX lamps with suitable reflectors, or g. Multivapor lamps with suitable reflectors. This list is not intended to exclude new lamps available by advanced technology. 2.2.2 Tests which are conducted only for heat buildup within the test item may use infrared lamps of the incandescenttype or other radiant heating source approved by the procuring activity. 2.3 Solar radiation measurement. Solar radiation intensity shall be measured with a pyranometer in accordance with General Requirements, 3.1.3. 3. PROCEDURES 3.1 Procedure I. Accelerated steady state, solar radiation test, equipment nonoperating.
The test item shall be placed in the test chamber in accordance with General Requirements, 3.2.2, and exposed to radiant energy at the rate of I 104 *4 watts per square foot (355 i14 BTU per square foot per hour) or as specified in the equipment specification. The period of the test shall be 48 hours (or longer if specified in the equipment specification)during which time the chamber temperature shall be maintained at 49 *2° C (120”F). At the conclusion of the exposure period, and with the chamber temperaturemaintained as specified, the test item shall be operated and the results obtained in accordance with General Requirements, 3.2.
The test item shall then be returned to room temperature, inspected, and results obtained in accordance with General Requirements, 3.2. METHOD 505.1 505.1-2 1: