MIL-PRF-11767G(AT)
4.8 Environmental verification. After each of the following environmental tests, the relay
assembly shall be subjected to the tests specified in 4.10.1, 4.10.4, 4.10.5, and 4.10.7, except for
control tests which shall be conducted only at a temperature of 77 + 15°F.
4.8.1 Vibration. To determine conformance to 3.4.1, the relay assembly (rigidly mounted
without brackets or shock absorbers) shall be subjected to a simple harmonic motion having an
amplitude of 0.03 inch (in.) (0.06 in. maximum total incursion), the frequency being varied
uniformly between the approximate limits of 10 to 55 Hertz (Hz). The entire frequency range,
from 10 to 55 Hz, shall be traversed in approximately one minute. This motion shall be applied
for a period of one hour along each of three mutually perpendicular directions. Pins E and G of
the machine gun relay coil shall be connected to 28.5 Vdc power source for half of the time. To
determine electrical malfunction of the relay assembly, contact opening or closing shall be
monitored between pins A and D of relay assembly.
4.8.2 Shock. To determine conformance to 3.4.2, the relay assembly (rigidly mounted
without brackets or shock absorbers) shall be exposed to a half-sine wave shock impulse of
25 + 3 gravity units for 6 to 9 milliseconds (ms) duration (see figure 1). The shock impulse shall
be applied along three mutually perpendicular axes. This test shall be conducted once in
energized position and once in deenergized position of the relay assembly. When the relay is
tested in the energized position, the maximum contact opening duration shall not exceed 2 ms.
1.15A
A
.85
SINE WAVE TRANSLATED
UP BY AN AMOUNT .15A
SINE WAVE (IDEAL)
SINE WAVE TRANSLATED
DOWN BY AN AMOUNT .15A
.05 A
.2 A
0
0
.2A
-.05 A
.4 D
D
.1 D
š
Vi = 2 AD/
V = Vi ± 10 %
FIGURE 1. Tolerances for half-sine shock pulse.
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