Downloaded from https://www.everyspec.com MIL-STD-810D 19 July .1983 Step 2. Expose the te,stitem to continuous 24-hour cycles of controlled simulated solar radiation and dry-bulb temperature.as indicated in table 505.2-II or as speoified in the equipment specification. The number of cycles performed shall be whichever of the following is longer: . a. The,minimum necessary to insure that the peak response temperature of the mo9t critical area of the test item achieved during a_cYcle is within ti° C (&l.6° F) of the peak response temperature cycle, or achieved during-the previous 24-hour b. Three centinuous cycles.
intensity in a minimum of four steps curve’of figure 505.2-3 (table Increase and decrease the solar radiation ‘uP’and fOUr steps down to approximate the 505.2-I). The test item may-or may not be operated throughout the test, at the option of the equipment specification. When an evaluation of the heating effects .isImportant, operation at least”at p-eaktemperature ahpuld ‘be specified. For certain one-shot items (e.g., rockets), thermocouples affixed to critical portions of the test item should be used to determine the time and value of peak temperatu~e. The time of operation shall coincide with peak temxrature., . . Step 3.
Continue cycling until the peak response temperature (measured’at representative locationa) achieved during a cycle is within &?oC (~ .60F) of the peak response temperature achieved during the previous 24-hour cycle, or during T cycles, whichever comes ffrat. Step 4. step 5. .Con$qctan operational checkout of the test item as in II-2.2, ‘.Step 5. and maintain achieved. Adiust the chamber air temperature to standard ambient conditions until temperature stabilization of the test item has been Step 6. Conduct a complete visual examination of the test item. Step 7. Document the results. Step 8. step 5. .. Conduct an operational checkout of the tes”titem as in II-2.2, Step 9.
Document the results. Step 10. Compare these data with “thepretest data. .. II-3.2 Procedure II - Steadv state for urobw@aXhiC effecti Step 1. Adjust the solar radiation source to a radiant energy rate of 120 ~ 47 W/m2 (355 ~ 14 Btu/ft2/h), or as specified in the equipment specification, and a temperature of 49° C (120° F). METHOD 505:2 19 July 1983 505.2-15