MIL-STD-810H, Environmental Engineering Considerations and Laboratory Tests
Last Updated 29 Oct 2026
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4 tables appear under this heading.
1. PDF page 774
Option 1: Equipment which is Powered ON at temperatures less than the normal operating temperature (Figure 520.5-3a, Note 3):
Option 2: Equipment Powered ON during the mission at Operational Temperature (Figure 520.5-3b, Note 4):
a. Ramp to Cold/Dry Min Power ON Temp: With the test item(s) non-operating, ramp the chamber temperature from standard ambient conditions to the Min Power ON temperature at a rate of no more than 5ºC/minute (9ºF/minute).
a. Ramp to Operational Cold/Dry - With the test item(s) non-operating, ramp the chamber temperature from standard ambient conditions to the low operating temperature at a rate of no more than 5 ºC/minute (9ºF/minute).
b. Cold/Dry Stabilization - Stabilize the test item at the Min Power ON temperature. Reference Part One paragraph 5.4.2.
b. Cold/Dry Stabilization - Stabilize the test item at the low operational temperature. Reference Part One paragraph 5.4.2.
c. Cold/Dry Warm-up - Power ON the test item at the required voltage (nominal, high, low) and frequency (See Table 520.5-III). Maintain this condition for the minimum specified warm-up period. (Note: some equipment may require conditioned air prior to start up.)
c. Cold/Dry Warm-up - Power ON the test item at the required voltage (nominal, high, low) and frequency (See Table 520.5-III). Maintain this condition for the minimum specified warm-up period. (Note: some equipment may require conditioned air prior to start up.)
2. PDF page 775
Option 1 (Con't): Equipment which is Powered ON at temperatures less than the normal operating temperature (Figure 520.5-3a, Note 3):
Option 2 (Con't): Equipment Powered ON during the mission at Operational Temperature (Figure 520.5-3b, Note 4):
d. Cold/Dry Functional Test - Perform a functional test immediately following Option 1, step 2.c, to verify the test item operates as required and record data for comparison with pre-test and post-test data. If the test item fails to operate as intended, see paragraph 5 (Analysis of Results) for failure analysis and follow the guidance in paragraph 4.3.2 for test item failure.
d. Cold/Dry Functional Test - Perform a functional test immediately following Option 2, step 2.c, to verify the test item operates as required and record data for comparison with pre-test and post-test data. If the test item fails to operate as intended, see paragraph 5 (Analysis of Results) for failure analysis and follow the guidance in paragraph 4.3.2 for test item failure.
e. Ramp to Operational Temperature (Warm-up) - At the completion of the functional test, with the test item operating, ramp the chamber to the low operational temperature at a rate of no more than 5 °C/minute (9°F/minute).
e. At the completion of the functional test, with the test item operating, proceed to step 3.
f. Proceed to step 3
3. PDF page 776
Option 1: Equipment which is Powered ON at temperatures greater than the normal operating temperature (Figure 520.5-3a and Note 3):
Option 2: Equipment Powered ON during the mission at Operational Temperature (Figure 520.5- 3b and Note 4):
a. Ramp to Hot/Dry Max Power ON temp: With the test item(s) non-operating, ramp the chamber temperature to the Max Power ON temperature at a rate of no more than 5˚C/minute (9˚F/minute).
a. Ramp to Operational Hot/Dry - With the test item(s) non-operating, ramp the chamber temperature to the high operational temperature at a rate of no more than 5˚C/minute (9˚F/minute).
b. Hot/Dry Stabilization - Stabilize the test item at the Max Power On temperature. Reference Part One paragraph 5.4.2.
b. Hot/Dry Stabilization - Stabilize the test item at the high operational temperature. Reference Part One paragraph 5.4.2. If supplement cooling is required, there shall be no supplemental cooling for the first 2 minutes of the stabilization period. This shall be followed by a linear drop in the supplemental cooling air temperature to the specified cooling temperature. The cooling air temperature ramp rate shall be determined from the platform ECS specification.
c. Hot/Dry Power ON - Power ON the test item at the required voltage (nominal, high, low) and frequency (See Table 520.5-III). If supplemental cooling is required, there shall be no supplemental cooling for the first 2 minutes following power on. This shall be followed by a linear drop in the supplemental cooling air temperature to the specified cooling temperature. The cooling air temperature ramp rate shall be determined from the platform ECS specification.
c. Hot/Dry Power ON - Power ON the test item at the required voltage (nominal, high, low) and frequency (See Table 520.5-III).
d. Hot/Dry Functional Test - Perform a functional test immediately after Power ON in option 1, step 15.c to verify the test item operates as required and record the test data for comparison with pre-test and post-test data. If the test item fails to operate as intended, see paragraph 5 (Analysis of Results) for failure analysis and follow the guidance in paragraph 4.3.2 for test item failure.
d. Hot/Dry Functional Test - Perform a functional test immediately after Power ON in option 2, step 15.c to verify the test item operates as required and record the test data for comparison with pre-test and post- test data. If the test item fails to operate as intended, see paragraph 5 (Analysis of Results) for failure analysis and follow the guidance in paragraph 4.3.2 for test item failure.
4. PDF page 777
Option 1 (Con’t): Equipment which is Powered ON at temperatures greater than the normal operating temperature (Figure 520.5-3a and Note 3):
Option 2 (Con’t): Equipment Powered ON during the mission at Operational Temperature (Figure 520.5-3b and Note 4):
e. Ramp to Operational Temperature - At the completion of the functional test, with the test item operating, ramp the chamber temperature to the high operational temperature at a rate of no more than 5°C/minute (9 °F/minute)
e. At the completion of the functional test, with the test item operating, proceed to step 16.