MIL-DTL-5099C
4.5.7 Scale error (-55 °C (-67 °F)). For a period of not less than 12 hours prior to this
test, the indicator shall not have been subjected to any test involving operation at other than
atmospheric pressures. The scale error (room temperature) test shall be repeated with the
difference that the temperature of the indicator having been maintained for a 3-hour period prior
to and during the test at -55 °C (-67 °F). The test points shall be those given in table V. The
change in scale errors, of this test from corresponding scale errors in the room temperature test,
shall not exceed the tolerance specified in table IV.
4.5.8 High temperature characteristics. The indicator shall be subjected to a temperature
of 70 ±2 °C (158 ±4 °F) for a period of 3 hours. It shall then be allowed to cool to ambient room
temperature, after which it shall be subjected to, and meet the requirements specified for, case
leakage and scale error (room temperature) tests (see 4.5.2 and 4.5.3).
4.5.9 Vibration error. The indicator shall be tested in accordance with vibration
procedure I, method 514, of MIL-STD-810. While the indicator is being vibrated at frequencies
from 10 to 40 Hz, the range of the pointer oscillation shall not exceed 250 feet and the pointer
variation from its original position shall not exceed 250 feet. While the indicator is being
vibrated at frequencies from 40 to 500 Hz, the range of pointer oscillation shall not exceed
400 feet and the pointer variation from its original position shall not exceed 400 feet.
4.5.10 Overpressure. The indicator shall be subjected to an absolute pressure of
50 inches Hg for a period of 1 hour, and then to ambient atmospheric pressure for the next
6 hours. Immediately following the 6 hours at atmospheric pressure, the scale error (room
temperature) test (see 4.5.3) shall be performed. The scale errors shall not vary from the
previously noted scale errors by more than the allowable variation listed in table VII.
TABLE VII. Allowable overpressure scale error.
Standard altitude
Variation
(feet)
(±feet)
0
200
5,000
200
10,000
200
20,000
200
25,000
200
30,000
200
35,000
300
40,000
300
45,000
400
50,000
400
4.5.11 Magnetic effect. The indicator shall be placed with its nearest part 6 inches from
the center of an uncompensated short bar magnet compass in a horizontal magnetic field of 13.53
to 15.12 ampere-turns per meter. When the indicator is rotated 360 degrees about its two
horizontal axes at each of the six 90 degree positions about the compass, the compass deflection
shall not exceed 1 degree from its reference position.
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