MIL-C-70512(AR)
3.2.1 MIL-F-13926.
Dimensions and tolerances
a.
Inorganic protective surface finishings
b.
Part identification and marking
c.
d. Workmanship
Soldering electrical connections
e.
3.2.2 MIL-C-46357.
a.
Etched circuit assemblies
Wiring
b.
Threaded fasteners
c.
Marking
d.
Finishes
e.
3.3 Environmental service conditions.
3.3.1 Vibration. The component board shall be mounted on the
vibration table in such a manner that one of the vibration axes
will be perpendicular to the plane of the board. The component
board shall meet the requirements of 3.4 and 3.5 after being
subject to continuous vibration for two hours along each of-three
mutually perpendicular axes within the frequency range and
amplitude as-follows:
EXCURSION (DOUBLE AMPLITUDE)
FREQUENCY RANGE
(Hz + 2 PERCENT}
(INCHES + 10 PERCENT)
5 to 15
0.06 inch
0.04 inch
15 to 25
0.02 inch
25 to 55
each frequency range shall not
The
of change of frequency
exceed one cycle-per-second per second (1 cps/see) . Vibration
tests shall be conducted under ambient room-conditions.
3.3.2 Shock. The component board shall not suffer damage and
shall meet requirements of 3.4 and 3.5 after being subjected to
18 impact shocks, consisting of three shocks in opposite directions
along each of the three mutually perpendicular axes. The shock
impulses shall have an acceleration of 15 gravity units (G's) and
1 milliseconds. The G value of each
a pulse duration of 11
impulse shall be within + 10 percent when measured with a 0.2 to
250 HZ filter and the maximum G shall occur at approximately 5-1/2
milliseconds.
3
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