MIL-PRF-14409J
3.11 Torque.
3.11.1 Driving torque. Unless otherwise specified (see 3.1), when measured as specified in 4.5.8.1, the torque
required to start and maintain rotation of the rotor shall be greater than or equal to 1 and less than or equal to 10
inch-ounces at all temperatures.
3.11.2 Torque bushing strength (panel mount units only). When capacitors are tested as specified in 4.5.8.2,
there shall be no evidence of bushing breakage, thread stripping, or other visible mechanical damage.
3.12 Temperature coefficient and capacitance drift. Unless otherwise specified (see 3.1), when capacitors are
tested as specified in 4.5.9, the temperature coefficient and capacitance drift shall be within the limits specified in
table I.
3.13 Immersion (sealed units only) (see 3.1). When capacitors are tested as specified in 4.5.10, the following
requirements shall be met:
a. Capacitance (maximum): Shall change not more than .5 pF or 5 percent, whichever is greater.
b. Insulation resistance at room ambient temperature: Shall be not less than 100,000 megohms.
c. Dielectric withstanding voltage: As specified in 3.9.
3.14 Salt atmosphere (corrosion).
3.14.1 Salt atmosphere (corrosion) (sealed units only) (see 3.1). When capacitors are tested as specified in
4.5.11.1, the following requirements shall be met:
a. Insulation resistance at room ambient temperature: Shall not be less than 100,000 megohms.
b. Dielectric withstanding voltage: As specified in 3.9.
c. Driving torque at room ambient temperature: As specified in 3.11.1.
d. Corrosion of exposed metallic surfaces shall not exceed 10 percent. Discoloration and tarnishing alone
shall not be cause for rejection.
3.14.2 Salt atmosphere (corrosion) (unsealed units only). When capacitors are tested as specified in 4.5.11.2,
corrosion of exposed metallic surfaces shall not exceed 10 percent. Discoloration and tarnishing alone shall not be
cause for rejection.
3.15 Low-temperature storage. When capacitors are tested as specified in 4.5.12, there shall be no visible
mechanical damage to the capacitors.
3.16 Shock (specified pulse). When capacitors are tested as specified in 4.5.13, there shall be no intermittent
contacts of 0.5 milliseconds (ms) or greater duration, or momentary arcing, open-circuiting or short-circuiting, or any
evidence of fractures, loosening of parts, or other visible mechanical damage.
3.17 Vibration, high frequency. When capacitors are tested as specified in 4.5.14, there shall be no intermittent
contacts of 0.5 ms or greater duration, or momentary arcing, open-circuiting or short-circuiting, or any evidence of
fracture, loosening of parts, or other mechanical damage visible under 10 power magnification. The capacitance
change shall be not more than 1 percent or 0.05 pF, whichever is greater, from the initial value obtained when
measured as specified in 4.5.14.
3.18 Barometric pressure (reduced, qualification only). Unless otherwise specified (see 3.1), when capacitors are
tested as specified in 4.5.15, they shall withstand a potential of 50 percent of the dc rated voltage or 500 volts,
whichever is less without damage, arcing, or breakdown.
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