MIL-DTL-82909A (OS)
c. For each test conducted, the actual meter value/reading shall be recorded along with the battery
pack serial number and individual thermal battery serial number.
d. Each battery pack shall meet the requirements of 3.5.6.
4.3.7 Vibration test. The battery packs shall be submitted to the non-gunfire vibration test profile: 2 at
-65°F, 2 at 70°F, and 2 at 200°F. After the non-gunfire vibration, one battery pack from each group (total
of three) shall be subjected to the gunfire vibration test profile at 70°F. The test fixture shall conform to
Drawing 838AS229. The battery packs, with their protective plugs and caps installed, shall be vibrated
along each of the three mutually perpendicular axis orientations as shown in figure 1.
a. Non-gunfire vibration.
(1) Resonance search (5 Hz to 2,000 Hz): A resonance search shall be conducted on two of the
battery packs at 70°F in the axis I orientation (one at a time). The frequency sweep shall be made from 5
Hz to 2,000 Hz in approximately 10 minutes at the test levels indicated in figure 2. The resonant points
shall be noted and a transmissibility plot obtained. A resonant point is defined as a point which has a
transmissibility (output/input) of two or greater. If more than four points are noted from the search, only
the four most severe will be used for resonance dwell. The resonant points of separate battery packs shall
be considered the same if the modes are identical and the resonant frequencies fall within 3 percent of the
mean resonant frequency for each mode. If the resonant points are the same (frequencies as above and
identical modes), the resonant frequency nearest the center of the 6 percent band shall be used and the
battery packs vibrated simultaneously during resonance dwell. If the resonant points are not the same as
defined above, the battery packs shall be vibrated separately during the dwell.
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