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| MIL-P-46320C(MU)
4.8 Test methods and procedures.
and shall conform to the requirements speci-
fied.
4.8.1 Qualification tests.
4.8.1.6 Mechanical shock. This test shall
4.8.1.1 ConStruction. The power supply
be conducted in accordance with Method
202 of MIL-STD-202. Subsequent to the
shall be subjected to a visual tactile and
shock test the power supply shall be sub-
dimensional inspection for conformance to
jected to a visual and tactile examination
the drawing and requirements of this spec-
ification. Dimensional inspection shall be
and shall show no evidence of physical fail-
ure. The power supply shall then be sub-
performed using standard measuring equip-
jected to the following tests and shall con-
ment.
form to the requirements specified in 3.7.3.
4.8.1.2 External surfaces. The external
4.8.1.7 Vibration. This test shall be con-
metallic case of the power supply shall be
ducted in accordance with Method 201 of
visually inspected for completeness of the
MIL-STD-202, except that the motion shall
specified finish. Thickness measurements of
be applied for a period of 10 minutes in
plating will be made by use of standard
each of the 3 mutually perpendicular direc-
measuring equipment. Destructive testing,
tions (total of 30 minutes). Performance
when necessary for QPL analysis, shall be
measurements of the power supply are not
performed using standard measuring equip -
required during vibration testing. Subse-
ment.
quent to vibration, the power supply shall
4.8.1.3 Minimum operating life. The power
be subjected to a visual and tactile examina-
supply shall be subjected to a minimum of
tion and shall show no evidence of physical
1000 hours of continuous operation and then
failure. The power supply shall then be
subjected to the following tests and shall
subjected to the following tests and shall
conform to the requirements specified in 3.11.
conform to the requirements specified in
3.7.4.
4.8.1.4 Thermal shock. This test shall be
4.8.1.8 Hermetic sealing. The power sup-
performed in test chambers that shall main-
tain the power supply at the required tem-
ply when at a temperature not to exceed
100 Fahrenheit shall be immersed for 2 to
Perature for the time periods indicated.
Subsequent to each specified temperature
3 minutes in a bath of water, or any other
suitable liquid of no greater viscosity, main-
cycle, high and low, the power supply shall
be subjected to a visual and tactile exam-
tained at a temperature of at least 180
ination and shall show no evidence of dam-
Fahrenheit. During this test the power sup-
age.
ply shall be considered to have met the spec-
ified performance requirement when visual
examination provides no evidence of air
4.8.1.5 Operating temperatures. This test
leakage, resulting in a continuous flow of
shall be conducted in accordance with Proce-
air bubbles, or compound leakage.
dure I of MIL-F-13926, except that the
temperature shall not be reduced beyond
4.8.1.9 Input polarity. This test shall be
minus 40 or raised beyond plus 125 Fahr-
conducted with standard measuring equip-
enheit. While stabilized at each temperature
ment. Input polarity of the power supply
extreme the power supply shall be energized
shall conform to the requirements specified
and continuously operated for the time
in 3.8.1.
period specified. At the completion of this
operating period the power supply shall be
4.8.1.10 Input immunity. This test shall
subjected to the tests specified in 4.8.1.17.1,
be conducted by applying a minus 1.52 volts
4.8.1.17.2.1, 4.8.1.17.2.3, 4.8.1.17.3, 4.8.1.17.4
7
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