MIL-C-5G
4.6.4 Insulation resistance (see 3.7).
4.6.4.1 At room ambient temperature. Capacitors shall be tested in accordance with method 302 of MIL-STD-202.
The following details shall apply:
a. Test-condition letter: A.
b. Points of measurement: From terminal to terminal. (Condensed moisture may be removed by a blast of air.)
4.6.4.2 At high ambient temperature. Capacitors shall be subjected to the applicable high ambient temperature
(see 3.1 and table IV) for a period of time sufficient to reach thermal stability and shall then be measured as specified
in 4.6.4.1.
4.6.5 Dissipation factor (see 3.8). Dissipation factor shall be measured at a frequency of 1 MHz ± 1,000 Hz when
the nominal capacitance is 1,000 pF or less, and 1 kHz ± 100 Hz when the nominal capacitance is greater than 1,000
pF. Measurement accuracy for direct reading methods shall be within ±2 percent of the readout or ±0.0005
dissipation factor, whichever is greater. If obtaining dissipation factor measurements by an indirect method, an
analysis should be made to show that the calculated value is within the specified limits when considering the worst-
case error stated by the measurement accuracy of the measurement instrument. Frequency accuracy shall be ± 1
percent.
4.6.6 Capacitance (see 3.9). Capacitance shall be measured in accordance with method 305 of MIL-STD-202 at a
frequency of 1 MHz ± 10 percent when the capacitance is 1,000 pF or less, and at a frequency of 1 kHz when the
capacitance is greater than 1,000 pF. Capacitance measurements shall be made at 25°C and need not be more
accurate than ±(0.2 percent +0.5 pF).
4.6.7 High frequency vibration (grade 3) (see 3.10). Capacitors shall be tested in accordance with
method 204 of MIL-STD-202. The following details and exceptions shall apply:
a. Mounting: Capacitors shall be rigidly mounted by the body to a vibration-test apparatus.
b. Test-condition letter: D (20G).
c. Measurements during vibration: During the last cycle in each direction, an electrical measurement shall be
made to determine intermittent contacts of 0.5 ms or greater duration, or open-circuiting or short-circuiting.
d. Examination after test: Capacitors shall be visually examined for evidence of mechanical damage.
4.6.8 Thermal shock and immersion (see 3.11).
4.6.8.1 For qualification inspection.
4.6.8.1.1 Thermal shock. Capacitors shall be tested in accordance with test condition A,
method 107, of MIL-STD-202, except that at step 3, the maximum temperature shall be 85° +3° -0°C, 125° +3° -0°C,
and 150 +3° -0°C, as applicable.
4.6.8.1.2 Immersion. Thermal shock shall be followed by immersion in accordance test with condition B,
method 104, of MIL-STD-202. At the end of the immersion, surface moisture shall be removed by circulating air at
room temperature, or wiping with a clean dry cloth, or both. The elapsed time between the removal of the capacitors
from the immersion tank and the measurements shall not exceed 30 minutes.
4.6.8.1.3 Measurements. After thermal shock and immersion, the dielectric withstanding voltage, insulation
resistance, dissipation factor, and capacitance shall be measured as specified in 4.6.2, 4.6.4.1, 4.6.5, and 4.6.6,
respectively.
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