Downloaded from https://www.everyspec.com MIL-STD-810D 19 July 1983 a. ~dard ambim. Ambient measurements and checks (e.g., pre- and post-test) are conducted at room ambient conditions as follows: : 0 Temperature: 25° C 2 10° C (77° F t 18° F) ., .. Relatife humidity: Uncontrolled room ambient ~~,‘;:’ ,.. Atmospheric pressure: Site pressure b. CmLrOlled am bti. When the ambient conditions must be closely controlled, the following shall be maintained: s Temperature: 23° C : 2° C (73° F t 3.60F) ,., Relative Humidity: 50 percent f 5 percent \ Atmospheric Pressure: 96.45 ~~~ Okpa ., 4.4.1 ~ces for t& conditions. Unless otherwise specified, tolerances for teat conditions shall be as follows: a.
~. The test item shall be ‘totallysurrounded by an envelope of air (except it necessary support points). The temperature of the test o section measurement system and the temperature gradient throughout thi+ envelope, which is measured close to the test item, shall be within f 20c (~ 3.6oF) Of the test temperature and shall not exceed Per meter ,Or a maximum of 2.2° C total (equipment nonoperating). b. Yressure. When pressure is 1.3 x 10-3 Pa or higher, it shall be measured with an accuracy of -~ percent of the measured value. c. Low ureasure. When pressure is lower than 1.3 x 10-3 Pa it shall be measured with an accuracy of :10 percent of the measured value. d. Humiditv.
Relative humidity at the chamber control sensor shali be :5 parcent of the measured value. Sinusoidal: ~10 percent Random: See method 514.3 f. Yibration Vibration frequency shall be measured with an * accuracy of 22 percent, or fl/2 Hz belOw 25 Hz, .,:. g. A.. tiQQ. Acceleration shall be measured to within 310 percent. time shall be measured with an accuracy of ~1 percent... h. w. Elapsed .. 10