Downloaded from https://www.everyspec.com ., MIL-STD-81ODJ 19 July 1983 U/m2 shall include any radiation reflected from the test chamber walls”and received by the test item, but it should not inclu’delong-wave infrared radiation emitted by.the chamber walls. The radiation-measuringdevice ,sh.all be calibrated in the wavelength range of the test pource,radiaticna. TABLE 505.2-II. ~ectkal wav distribw and nermitted t~. .SpectralRegion CHARACTERISTIC ULTRAVIOLET VISIBLE INFRARED Bandwidth 0.28 to 0.32 to 0.40 to.,0.78u 0.78 to o.32p M 0.40Vm 3.00pm Irradiance 5 U/m2 63 ii/m2 517 to 604 U/m2 492 W/m2 Tolerance -5% S?5s *10% *20$ NOTE:
The amount of radiation wavelength shorter than 0.30y m reaohing Earthfs surface is insignificant. f. The radiation source shall be looated at least 76 cm,(30 inches) away from any other surface of the teat item. 6. LuhLmwQ (1) Tests conducted for degradation ariddeterioration of.materiala due to actinic effects, as well as heat buildup within the test items, must satisfy the full spectrum of table 505.2-11 and may use one of the fcl+owing acceptable radiation sources: (a) Xenon arc or mercury xenon arc (used singly) with suitable reflector. (b) CombinatIon of high pressure sodium vapor and improved mercury vapor with suitable reflectors.
(c) High-intensity multivapor, mercury vapor (with suitable reflectors), and incandescent apot lamps. (d) Carbon arc lamps with suitable reflectors. NOTE: Other combinations of the lamps listed above and in II-1.lg(2) below may be used if it is proven that the ccmbination produces the spectrum of table 505.2-II. , (2) Teats in which it is not sought to ,reprcducethe”sun’s spectrum may ise the appropriate lamps from: 0 MRTHOD 505.2 19’July:1983 505.2-11