Downloaded from https://www.everyspec.com I MIL-STD-81OD 19 July 1983 METHOD 503.2 ., TEMPERATURE SHOCK ,. . ,,. SECTIO.NII 11-1 ~,.’. .. . ... II-1.1 ~ a. -The,required apparatus consists of-two chambers or cabinets in which the test conditions can be established and maintained. Unless otherwise spe~ifled, the chambers must be equipped,so that, after trsnsfer of the ‘est ~ item, the test conditions within the chamber can be stabilized within 5 minutes. Material-handling equipment gay be necese?qy for tranager of the teat item between chambers. b.
The chambers shall be equipped with auxiliary,instrumentation capable of maintaining and centinuouely monitoring the test.conditione throughout an envelope of air surrounding the test item(s). (See General Requirement, 4,4.1a.). 11-1.2 QX&CQla a., ~. Unless otherwise epecified in the test plan, if any action other than test item operation (euch ae opening of the chamber door”, except at transfer time) results in a significant change (more than 2° C. (3.60F)) of the test item temperature or chamber air temperature, the te?t item will be.stabilized at the required temperature before continuation. b. ~.
Air velocity in.the vicinity of the test item shall not exceed 1.7 mls (325 ft/min) to provide standard teeting conditions, unlese Justified by the test item platform environment. c. -er tiu@. Transfer the test item between the two environments (high and low temperatures) as rapidly ae possible but in no more than 5 minutes (unless the test item ie large and requires handling,6quiPment). 11-1.3 ~ (See General Requirements~ 4.5.4.) a. ~.
If, before the temperature change, an un- scheduled test interruption occurs that caueee the test conditions to exceed allowable tolerances toward standard ambient temperatures, the test,must be reinitiated at the point.of interruption and the test.item .reestabliehedat the test condition.. If the interruption occurs during the tranefer, the test item must be reestablished at the previoue temperature and then transferred. ,. . ,.. . :. MSTHOD 503.2 19 July 1983 503.2-1“0