Downloaded from https://www.everyspec.com AL-STD- 81OC c. All characteristicswhich are likely to be affected by low tempera- tures shall be checked first. Should the time required to check the test item exceed 15 minutes beyond the warmup time, the test item shall ag’ainbe stabilized at the temperature specified for step 2 in ‘tab’i&” s04.1-1I and the operational check continued. d. For equipment other than electronic equipment, the input conditions shall be such as to produce the maximm. internal physical stress. e.
When the chamber door is opened it is intended that frost will form; however, should the relative humidity of the air be such that frost wil1 not form, an artificial means shall be used to provide the relative humidity necessary to have frost form. f. Following those steps where a change in temperature at low:pressure is required, the pressure may be increased to ambient before chang- ing the temperature and then returned to the required pressure following.temperature stabilization. 4. SUMMARY. The following details shall be as specified in the equipment specifications: a. Pretest data required b. Pertinent equipment operation parameters limits (input voltage, etc.) c. Failure criteria.
METHOD 504.1 504.1-8