Downloaded from https://www.everyspec.com :MIL-STD-810D 19 July ,1983. ,:. ,. M3THOD 501.2 : . HIGH TEt&ERATURE i “.!. ..~. . . . ... ;., ..,. ,.”*,f.,.’” . . :; . SECTION II II-1 ~ ,.’., ,,...,. ., . II-1.1’‘~ ,. a. The required apparatus consists of a chamber or cabinet together with auxiliary instrumentation capable of maintaining and centinuously monitoring the required conditions of high temperature (and humidity, where required) throughout an envelope of air surrounding the test item(a). (See General Requirements, 4.4.1.) . b.
Air velooity in the vicinity of “the test item shall not’exceed ,1.7mls (325 ft/min) unless justified by the teat item platform environment to prevent unrealistic heat tranefer in the test item. c. Continuous recordings of chamber and test item temperature measurements shall be taken if required. 11-1.2 Gmf@2LS a. Temperature. Unless otherwise ,specifiedin the test plan, if any action other than test item operation (such as opening the chamber door) results in a significant change of the test’item temperature (more than’2° C (3.6oF)) or chamber air temperature, the test item will be restabilized at the required temperature before the test continues.
If the operational check is not”completed within 15 minutes, reestablish test “itemtemperature/RH conditions before centinuing. b. Unless otherwise specified, the exceed 10oC (180F) per minute. rate of temperature change shal1 not II-1.3 mt interrut) t. m. (See General Requirements, 4.5.q.) a. JJ@ertest lnterrurition , (1) Cycling. lf a cyclic high-temperature test is being conducted when an unscheduled interruption occurs that causes the test conditions to fall out of ,allowabletolerances toward “standardamb,ienttemperatures, the test must be reinitiated at the end of the.last successful y completed cycle. .
(2) Steady-state; If a steady-state (noncyclic) test is being conducted and an unscheduled interruption occurs that causes the test condi- tions to fall out of allowable tolerances toward standard ambient conditions, the test item shall be restabilized at the required test temperature and the test continued from the point where test condition were left. Duration of initial and final test periods shall be recorded. 19 JuIY-1983 501.2-13 METHOD 501.2 ;