Downloaded from https://www.everyspec.com MIL-STD-81OC Step 11 - With the test ternde-energized, adjust the chamber -. temperature to that specified in step 11 of table 504.l-II (see note (f)), and maintain until completion of the fourth operating time period. 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 11 of table 504.1-11. The test item shall be operated for four time periods each of the duration specified in step 11 of table 504.1-11.
The first three time periods of operation shall be followed by a 15-minute period with the test item de-energized. The test item shall be checked for satisfactory operation during each operating time period and the results recorded. Thermal sensor readings of the test item temperature shal1 be recorded every 10 minutes of test item operation. ., Step 12 - With the test item de-energized, adjust the chsmber temperatureto that specified in step 12 of table 504.l-II (see note (f)). The test item temperature shall be stabilized.
The test item shall then be energized at the highest specified input voltage (see note (d)) and the chamber pressure adjusted to simulate the altitude speci- fied in step 12 of table 504.l-II. Maintain these test conditions for the length of time specified in step 12 of table 504.1-11. Thermal sensor readings of the test item temperature shall be recorded every 30 minutes. At the end of the time period specified in step 12 or table 504.l-II, and while maintaining the test conditions, the test item shal1 be checked for satisfactoryoperation and the results recorded.
Step 13 - With the test item de-energized, adjust the chamber temperature to that specified in step 13 of table 504.l-II (see note (f)), and maintain until completion of the fourth operating time period. 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 13 of table S04.l-II. The test item shall be operated for four time periods as’specified in step 13 of table 50411-,11. The first three time periods of operation shal1 be followed by a 15-minute period with the test item de-energized.
The test item shall be checked for satisfactory operation during each operating time period and the results recorded. Thermal sensor readings shall be recorded every 10 minutes of test item operation. 504.1-6 METHOD 504.1