Downloaded from https://www.everyspec.com MIL-STD-81OC Step 5 - Operate thetest item until the item is stabilized or as specified in the equipment specification,and obtain results in accordance with General Requirements, 3.2.4. ~,;?“.,: .. Step 6 - Return the test item, nonoperating to standard ambient condition and stabilize. Step 7 - Operate and inspect test item and obtain results in accordance with General Requirements, 3.2. NOTE: The rate of temperature change (steps 2, 4, and 6) may be the maximum attainable by the chamber, but shall not exceed IO”C (18”F) per minute. 3.2 Procedure II Step 1 - Prepare,,thetest item in accordance with General Requirements, 3.2.
Step 2 - Raise the internal chamber temperature to 49° C (120”F) Step 3 - Maintain internal chamber temperature for 6 hours at 49° c (120”F). Step 4 - Raise the internal chamber temperature to 71° C (160”F) within a time period of 1 hour,and then maintain at that temperature for 4 additional hours. J Step 5 - Lower the internal chamber temperature to 49° C (120°F) within a time period of 1 hour. Step 6 - Repeat steps 3, 4, and 5 two additional times (making a total of three 12-hour cycles). +!
Step 7 - Adjust the internal chamber temperature to the highest operating temperature under which the test item is designed to operate and maintain until temperature stabilizationof the test item is reached. Step 8 - Operate the test item until tbe item is stabilized or as speci- fied in the equipment specification and obtain results in accord- ance with General Requirements,3.2. METHOD 501.1 501.1-2