MIL-DTL-3965H
Measurements during exposure (at +85°C): DC leakage shall be measured as specified in 4.7.5 during the
f.
first hour of exposure and then at 240 +48 -0; 1,000 +48 -0; and 2,000 +72 -0 hours.
g.
Measurements after exposure: Capacitors shall be returned to the inspection conditions specified in 4.3 and
dc leakage, capacitance, and dissipation factor shall be measured as specified in 4.7.5, 4.7.6, and 4.7.7,
respectively. Capacitors shall then be visually examined for evidence of mechanical damage, obliteration of
marking, and leakage of electrolyte.
4.7.18.2 240-hour (group B inspection) (see 3.22.2). Capacitors shall be tested as specified in 4.7.18.1, except
that the duration of the test shall be 240 hour.
4.7.18.3 1,760 hours (group C inspection) (see 3.22.3). Capacitors shall be tested as specified in 4.7.18.1, except
that the duration of the test shall be 1,760 hours.
4.7.19 Barometric pressure (reduced) (for qualification only (see 3.23)). Capacitors shall be tested in accordance
with method 105 of MIL-STD-202. The following details shall apply:
a.
Method of mounting: By normal mounting means.
b.
Test condition: E (150,000 feet).
c.
Test during subjection to reduced pressure: At the end of the conditioning period and with the capacitors
still at reduced pressure, the specified voltage (see 3.1) shall be applied for 1 minute ±5 seconds.
d.
Test after subjection to reduced pressure: Capacitors shall be visually examined for harmful deformation of
the case, mechanical damage, obliteration of marking, leakage of electrolyte, and indications of flashover
and breakdown.
e.
Exposure time prior to measurements: 5 minutes (minimum).
4.7.20 Life at +125° C (see 3.1) (see 3.24). Capacitors shall be tested as specified in 4.7.18.1, with the following
exceptions:
Test temperature and tolerance: 125°C +7°C -0°C.
a.
b.
Operating conditions: Derated voltage (see 3.1) shall be applied.
c.
Measurements after exposure: Capacitors shall be returned to the inspection conditions specified in 4.3.1,
and dc leakage, capacitance, dissipation factor, dielectric withstanding voltage (insulated styles only), and
insulation resistance (insulated styles only) shall be measured as specified in 4.7.5, 4.7.6, 4.7.7, 4.7.3.2, and
4.7.4.2, respectively. Capacitors shall then be visually examined for evidence of mechanical damage,
obliteration of marking, and leakage of electrolyte.
4.7.21 AC ripple life at 85° C (when specified, see 3.1). Capacitors shall be tested as specified in 4.7.18.1, with
the following exceptions:
Operating conditions: Capacitors shall be tested at 40 ±2 kHz sinusoidal; current shall be as specified (see
a.
3.1).
b.
Polarizing voltage shall be one-half the rated dc voltage.
27
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business