Downloaded from https://www.everyspec.com MIL-STD-81OC 3.3 Test duration. When the intended mission time of the test item is such that the test item will be exposed to low pressure conditions for periods in excess of 24 hou s, the test chamber shall be maintained at a pressure 3 of at least 1 x 10- Torr for not less than 24 hours to properly validate the performance of the test item. Test item with intended flight times of less than 24 hours shall be exposed to low pressure for a time equal to or longer than the actual intended fright time to-properly validate the performance of the test item. Table 517.2-V.
Solar Simulator, InstrumentationPerformance Requirements Absolute Response Parameter accuracy Repeatability time Miscella.neous Total irradiance t3% +1% 1 “min. Spectral sensitivity: max. +2% for 2S00-25,000 Angstrom (Seenote1’ Y .) Irradiance Scan time must be uniformity N/A tl% 1 min. compatible with max. response time (See note 1) Solar subtense Reference to axis angle diver- 1/4° 1/4” N/A of chamber gence See note 1 Temporal Stability is% is% 1 sec. See note 2 Spectral distrib~tion See note 3 NOTES: 1. View angle should be 5 degrees or greater than the solar subtense angle.
2; Temporal stability as used in this standard means the intensity fluctuation of the source where the source is defined in its broadest sense to include the optics. No quantitativevalue can be given that will serve as a universal stability standard to which all sources must comply. It is self evident that the time constant of the test object or perhaps a local area of interest would have a direct bearing on the resultine criterion. Further. by the broadest interpretationof temporal sta~ility, intensity variations during 517.2-7 METHOD517.2