MIL-DTL-3965H
4.7.13.4 Wire-lead bend test. The terminal shall be inserted into the hole of the test block fixture and the wingnut
shall be tightened (see figure 1). There shall be a minimum of .188 inch (4.78 mm) but not more than .313 inch (7.95
mm) of terminal length between the test block fixture and the end of the case (for terminals with welds more than .188
inch (4.78 mm) from the end of the case, the bottom of the weld shall be flush with the test block fixture). With the
fixture firmly supported in a horizontal position, the case shall be forced over in such a manner that the terminal (from
end of case to fixture) is maintained in its axial position as closely as practicable while bending the terminal until the
end of the case touches the top surface of the fixture. When the case is returned to the starting position, one
complete bend will have been completed. The second bend shall be completed in the same manner as the first
except that it shall be in the reverse direction. Succeeding bends shall alternate in direction similar to the first and
second bends. All terminals shall be subjected to four bends. The rate of bend shall be approximately 5 seconds per
bend.
4.7.14 Surge voltage (see 3.18). Capacitors shall be subjected to 1,000 cycles of the applicable dc surge voltage
specified (see 3.1). The ambient temperature during cycling shall be 85°C +6°C, -0°C. Each cycle shall consist of a
30 +2, -0 second surge voltage application followed by a 5.5 minute discharge period. Voltage application shall be
made through a resistance of 1,000 ±100 ohms including the source in series with the capacitor and the voltage
source. Each surge voltage cycle shall be performed in such a manner that the capacitor is discharged through a
1,000 ±100 ohm resistor at the end of the 30 second application. The test shall be terminated on the discharge
portion of the cycle. During the test, an electrical measurement shall be made to detect intermittent contacts and
open-circuiting and short-circuiting. After the test, capacitors shall be visually examined for mechanical damage and
leakage of electrolyte.
4.7.15 Moisture resistance (see 3.19). Capacitors and brackets shall be tested in accordance with method 106 of
MIL-STD-202. The following details and exceptions shall apply:
a.
Mounting: Except during examination and measurements, capacitors shall be securely fastened by normal
mounting means.
b.
Initial measurements: Not applicable.
c.
Polarization and loading voltage: 6 volts dc or rated voltage, whichever is less.
d.
Step 7b: Vibration is not required during step 7b.
e.
Final measurements: After the final cycle and within 2 to 6 hours after removal of capacitors from the
humidity chamber, the dc leakage, capacitance, and dissipation factor shall be measured as specified in
4.7.5, 4.7.6, and 4.7.7, respectively.
f.
Examinations after test: Capacitors shall be visually examined for evidence of harmful corrosion,
mechanical damage, obliteration of marking, and leakage of electrolyte. Brackets shall be visually examined
for evidence of harmful corrosion, mechanical damage, and obliteration of marking.
4.7.16 Low temperature (storage) (see 3.20). Capacitors shall be tested in accordance with method 502 of MIL-
STD-810. The following details and exceptions shall apply:
a.
Pretest data required: DC leakage, capacitance, and dissipation factor measurements obtained from 4.7.5,
4.7.6, and 4.7.7, respectively.
Storage temperature: -62°C +0°C, -3°C.
b.
Exposure time: 72 hours followed by a 1 hour exposure at +125°C, +7°C, -0°C within 24 hours after low
c.
temperature storage.
d.
Steps not required: Steps 3, 4, and 5.
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