MIL-DTL-82909A (OS)
e. Each battery pack shall meet the requirements of 3.5.4.
4.3.5 Insulation resistance test. The insulation resistance test outlined in MIL-STD-202, Method 302
shall be used with the requirements listed below. The protective caps shall be installed on the inlet gas
ports at all times.
a. Test 1.
(1) The insulation resistance shall be measured twice in test 1: (1) between the S+/S- leads in
parallel to the battery case and (2) between the P+/P- leads in parallel to the battery case. Test condition
"B" shall be used as specified in Method 302. This indicates a 500 volts (dc) ± 10 percent test potential
shall be applied.
(2) The insulation resistance measurement shall be made and the actual current recorded
immediately after a 2-minute application of uninterrupted test voltage.
(3) However, if the instrument reading indicates that an insulation resistance meets the specified
limit (1 megohm), and is steady state or increasing, the test may be terminated before the end of the 2
minutes.
b. Test 2.
(1) The insulation resistance in test 2 shall be measured between the S+/S- (in parallel) leads
and the P+/P- (in parallel) leads connected together. The test condition shall be 250 volts (dc) ± 10 percent
test potential.
(2) The insulation resistance measurement shall be made immediately after a 2-minute
application of uninterrupted test voltage.
(3) However, if the instrument reading indicates that an insulation resistance meets the specified
limit (1 megohm), and is steady state or increasing, the test may be terminated before the end of the 2
minutes.
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 3.5.5.
4.3.6 Dielectric measurement test. The DWV test outlined in MIL-STD-202, Method 301 shall be used
with the requirements listed below. The protective caps shall be installed on the inlet gas ports at all times.
a. Three DWV tests shall be conducted between pin combinations: (1) between the S+/S- leads in
parallel to case; (2) between the P+/P- leads in parallel to case; and (3) between the S+/S- (in parallel) and
P+/P- (in parallel) leads connected together.
b. The battery insulation of each battery shall be submitted to 500 volts (ac) for 60 seconds. This shall
be conducted by using a voltage application rate of 500 volts RMS per second with the source having a
nominal 60 ±3 Hz frequency, which shall approximate a true sine wave in form. The leakage current shall
be measured with an accuracy of 5 percent.
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