Downloaded from https://www.everyspec.com 1 MIL-STD-81OC permitted throughout ployed for operation the test period other than with accessible controls em- of the test item. No repair or replacement of parts Equipment shall not be operated, except when specified shall be permitted. test measurements are being performed. Step S - Raise the internal ch~ber temperature to 30”C (86”F) and the relative humidity to 94 *4 percent. Step 6 - Subject the test item to five continuous 48-hour cycles in accord- ance with figure 507.1-2. The relative humidity shall be main- tained at 94 i4 pe-icentat all times.
Take measurements in accordance with ,GeneralRequirements, 3.2.3 at the periods shown on figure 507.1-2 unless otherwise specified in the equipment specification. Prior to measurements, accumulated moisture may be removed by turning the test item upside down or shaking. Wiping is not permitted. (Certain operating procedures require an effective preconditioningof the test item environment prior to operation. When this occurs, the period of measurement shall be kept as short as possible.] Step 7 - After completion of the step 6 cycling, open the test item and remove the chassis from its enclosure, in the test chamber.
Step 8 - Maintain the internal test chsmber temperature at 30”C (86”F) with the relative humidity at 94 *4 percent for 480 hours. During the last 5 hours of exposure, take measurements as specified in the equipment specification. Additional measure- ments may be made at the end of each 24-hour period, if so specified in the equipment specification. Prior to measurements, accumulatedmoisture may be removed by turning the test item up- side down or shaking. Wiping is not permitted. For electronic equipment, if removal of the test chassis from its enclosure will, of itself, adversely affect the operation of the test item, the test item may be replaced in its enclosure for measurements.
Step 9 - After completion of the 480-hour test, condition the test item at 23° C (73°F) and 50 *1O percent relative humidity for 24 hours. Step 10 - Adjust the test item to optimum performance only as permitted in the step 4 note. Step 11 - Operate and inspect the test item, and obtain results in accord- ance with General Requirements, 3.2, within 1 hour. METHOD 507.1 507.1-6 I I