MIL-PRF-14409J
4.5.3 Capacitance (see 3.6). Capacitors shall be tested in accordance with method 305 of MIL-STD-202.
Measurements shall be made using a test jig incorporating a guard provision. The following details and exception
shall apply:
a. Test frequency: Minimum and maximum rated capacitance shall be measured at a frequency of 1
megahertz (MHz) ±100 kilohertz (kHz).
b. Limit of accuracy: Shall be within ±1 percent or 0.05 pF, whichever is greater.
4.5.4 Change of capacitance (see 3.7). The rate of change of capacitance shall be monitored by any suitable
method while the capacitance is adjusted from the minimum rated value to the maximum rated value and back to the
minimum rated value. The rate of change of capacitance as a function of the change of adjustment shall be
monitored for change of sign.
4.5.5 Insulation resistance (see 3.8). Capacitors shall be tested in accordance with method 302 of MIL-STD-202.
The following details and exceptions shall apply:
a. Test condition: As specified (see 3.1).
b. Special conditions: Measurements shall be made at room ambient temperature and at the applicable high
test temperature. The relative humidity shall be between 20 and 50 percent; however, at the
manufacturer's option, measurements may be made at a relative humidity up to 80 percent.
c. Points of measurement: Insulation resistance shall be measured at the maximum rated capacitance setting
between the mutually insulated points.
d. Electrification time: 1 minute.
4.5.6 Dielectric withstanding voltage (see 3.9). Capacitors shall be tested in accordance with method 301 of MIL-
STD-202. The following details shall apply:
a. Magnitude and nature of test voltage: 200 percent of dc rated voltage (see 3.1).
b. Points of application of test voltage: Capacitors shall be set at maximum rated capacitance and the
potential applied between the terminals.
4.5.7 Quality factor (Q) (see 3.10). Capacitors shall be tested in accordance with method 306 of MIL-STD-202.
The following details and exceptions shall apply:
a. Test frequency: Unless otherwise specified (see 3.1), capacitors shall be set at maximum rated
capacitance as specified in 4.5.3 and Q shall be measured at a frequency of 20 MHz ±200 kHz.
b. Condition: The mounting means shall be snugly fitted against the capacitor when making measurements.
c. Measurements: Shall be made using a test jig designed for minimum stray capacitance effects.
d. Measurement accuracy: Shall be sufficient to guarantee the minimum Q specified.
4.5.8 Torque.
4.5.8.1 Driving torque (see 3.11.1). The torque required to start and maintain rotation of the rotor shall be
measured by a gradually applied force sufficient to turn the rotor through at least 50 percent of the total number of
rotations.
4.5.8.1.1 For qualification inspection. The test specified in 4.5.8.1 shall be performed at room ambient
temperature, -55°C +0°C -3°C, and at the applicable high test temperature, +5°C -0°C.
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