Downloaded from https://www.everyspec.com MIL-STD-81OC Steu la - With the test item de-enereized. adiust the chamber temDera- ture to that specified in ~tep la o~ table 5.o4.l-II. After the test item temperature has stabilized, the chamber pressure shall be adjusted to simulate the altitude specified in step la of table 504.l-II. Maintain these test conditions for at least the length of time specified in step la of table 504.l-II. At the conclusion of this time period the test item shall, (Equipment Categories 1 & 2 only) to the extent practical, be visualIy inspected for the presence of deteriorationwhich would impair future operation.
Step lb With the test item de-energized, adjust the chamber test conditions to those specified in step lb of table 504.l-II. After the test item temperature has stabilized,maintain these test conditions for at least the length of time speci- fied in step lb of table 504.1-11. Where it is possible, with- out changing the test conditions, the test item shall be visually inspected for the presence of deteriorate ion which would impair future operation. (All Equip- ment Cate- gories) Step 2 - With the test item de-energized, adjust the chamber test conditions to those specified in step 2 of table 504.l-II. These chamber test conditions shal1 be maintained through-, out this step.
After the test item temperature has stabilized, the test item shall be operated at the lowest specified input voltage (see note (b)). The test item shall operate satisfactorilyimmediately following the specified warmup time (see note (c)). The test item shall be de-energized and restabilized at the temperature ,. specified in step 2 of table 504.1-11. The above operational sequence shall be repeated two additional times. Step 3 - With the test item de-energized, adjust the chamber temperature to that specified in step 3 of table 504.1-11. The test item temperature shall be stabilized.
The test item shall be energized at the highest specified input voltage (see note (d)) and the chamber pressure adjusted to simulate the altitude specified in step 3 of table 504.l-II. Upon reaching the specified chamber pressure and while maintaining the chamber temperature, the test item shall be checked for satisfactoryoperation and the results recorded. 504.1-3 METHOD 504.1