MIL-DTL-82909A (OS)
4.3.2.1 Thermal battery. Each thermal battery, prior to manifold incorporation, shall be radiographed in
two directions, 90 degrees apart. Each radiograph orientation shall provide the best possible view of the
internal wiring and components of the thermal battery.
4.3.2.2 Battery pack. Each battery pack, after manifold incorporation, shall be radiographed in one
direction. The radiograph orientation shall be with the battery pack manifold lying flat to provide the best
possible view of both internal firing mechanisms.
4.3.3 Leakage test. Leakage shall be measured after bombing in Helium gas for 60 +1.0, !0.0 minutes at a
pressure of 1 +0.1, -0.0 atmospheres absolute and venting with air for 10 +2, -0.0 minutes or washed with
dry nitrogen. The thermal batteries shall then be tested in a dry gas leak tester. Each thermal battery shall
meet the requirements of 3.5.3.
4.3.4 Polarity test. The protective caps shall be installed on the inlet gas ports at all times during the test.
a. Each set of battery pins (S+, S-, and P+, P-) shall be tested to verify that the battery polarity
conforms to the polarity indicated on the battery case. The meter used shall be capable of measurements
approaching theoretical limits of sensitivity of 1013 ohms. Prior to the start of the test, the meter used shall
be reset to zero.
b. This test shall be conducted with the battery packs conditioned to 70°F. The conditioning time
shall be not less than 4 hours. Each battery pack shall be tested within 5 minutes after removal from the
conditioning chamber. If there is any doubt on any polarity measurement, repeat the test after temperature
conditioning at 180°F for at least 4 hours but not more than 24 hours.
c. Pins S+ and S-
(1) On the meter, set the function switch to the "V" (mv) position and set the range switch to the
highest range and then, upon testing, adjust to make a more precise reading.
(2) Connect the S+ and S- pins to the positive and ground connection points. The reading of the
meter shall be positive or positive going.
(3) Remove the connection and reconnect to the negative and ground connection points. The
reading of the meter shall be negative or negative going.
d. Pins P+ and P-
(1) On the meter, set the function switch to the "V" (mv) position and set the range switch to the
highest range and then, upon testing, adjust to make a more precise reading.
(2) Connect the P+ and P- pins to the positive and ground connection points. The reading of the
meter shall be positive or positive going.
(3) Remove the connection and reconnect to the negative and ground connection points. The
reading of the meter shall be negative or negative going.
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