Downloaded from https://www.everyspec.com NIL-STD-810D 19 July’1983 ,. METHOD 507.2 , .. HUMIDITY use SECTION I 1-1 PURPOSE . . . . . . . . . . .. . . I-2 ENVIRONMENTAL EFFECTS . . . . . . I-3 GUIDELINES FOR DETERMINING TEST .s PROCEDURES AND TEST CONDITIONS ~-~..’” SPECIAL CONSIDERATIONS . . . ~. . I-5 REFERENCES . . . . . . . . . . . . . . . . . . .. . . . 507.2-1 . . . . . . . . . . . 507.2-1 . . . . . . . . . . . 507.2-2 .. . ... . . .. ”’’.... 507.2-11 . . . . . . . . . . . 507.2-11 SECTION II II-1 .APPARATUS . . .’.’......’. . ... . ’.....-.. 507.2-13 II-2 PREPARATION FOR TEST . . .“... . . . ... . . . . . . . 507.2-14 II-3 PROCEDURES . . . . . . . . . . . . . . . . . . . . .
.507.2-15 II-4 INFORMATION TO BE RECORDED . . . . . . . . . . . . . . 507.2-17 SECTION I ,., I-1 ~. The humidity tests are performed to determine the resistance of materiel to the”’effectsof a.warm, humid atmosphere. 1-2 ~. Moisture can cause physical and chemical deteri- oration of materiel. Temperature changes and humidity may cause condensation inside of equipment. Typical problems that can result from exposure to a warm, humid environment are: ~ a. Swelling of materials due to moisture absorption. b. Loss of physical strength. c. Changes in mechanical properties. d. Degradation of electrical and thermal properties “in insulating materials. ,. e. Electrical shorts due to condensation. f.
Binding of moving parts “dueto corrosion or fouling of lubricants. s. Oxidation and/or galvanic corrosion of metals. Loss of plasticity. i. Accelerated chemical reactions. METHOD 507.2 507.2-1 19 July 1983