| a. Standard Ambient. | |
| When the term "standard ambient" is specified in the Methods of this standard, use the values shown below. If the term is not used and no specific values are called for in the test Method or the materiel specification, conduct item tests (e.g., pre-, during, and post-test) at standard ambient conditions. | |
| Temperature: | 25° ± 10°C (77 ± 18°F) |
| Relative humidity: | 20 to 80 percent |
| Atmospheric pressure: | Site pressure |
| b. Controlled ambient. | |
| When the ambient conditions must be closely controlled, maintain the following: | |
| Temperature: | 23° ± 2°C (73 ± 3.6°F) |
| Relative humidity: | 50 percent ± 5 percent |
| Atmospheric pressure: | 96.45 +6.6 / -10.0 kPa 28.5 +2.0 / -3.0 in Hg |
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