MIL-PRF-14409J
4.5.8.1.2 Conformance inspection.
4.5.8.1.2.1 Group A inspection. The test specified in 4.5.8.1 shall be performed at room ambient temperature.
4.5.8.1.2.2 Group C inspection. The test specified in 4.5.8.1 shall be performed at -55°C +0°C, -3°C, and at the
applicable high test temperature, +5°C, -0°C.
4.5.8.2 Torque, bushing strength (panel mounts only) (see 3.11.2). The capacitor shall be mounted through the
suggested hole (see 3.1) in a metal panel of .125 inch (3.18 mm) maximum thickness, while the applicable torque
specified in table VI is applied to the nut. The torque shall be applied in the direction which will tighten the nut and
shall be held at its specified value for a period of not less than 3 seconds. It shall be applied repeatedly to the nut
until a total of five twists have been applied. After the test, the capacitor shall be visually examined for evidence of
bushing breakage, thread stripping, or other visible mechanical damage.
TABLE VI. Torque.
Torque ±0.1 (inch-pounds)
Bushing size
.120
1.2
.190-64
3.0
.234
5.0
.190-32
6.0
.250
8.0
4.5.9 Temperature coefficient and capacitance drift (see 3.12).
4.5.9.1 For qualification inspection.
4.5.9.1.1 Temperature coefficient. With capacitors set at approximately 75 percent of maximum rated
capacitance, capacitance measurements shall be made at a frequency of 1 MHz ±100 kHz and at the temperatures
specified in table VII. Each measurement shall be made after thermal stability has been reached. (Thermal stability
has been reached when no further change in capacitance is obtained between two successive measurements taken
at 5 minute intervals.) Accuracy of measurements shall be within ±0.01 pF.
TABLE VII. Temperature coefficient and capacitance-drift cycle.
Qualification inspection
Conformance inspection
Steps
temperature (°C)
temperature (°C)
25 ±2
a
25 +2, -2
b
-55 +0, -2
-55 +0, -2
25 ±2 1/
c
-10 +2, -2
25 +2, -2 1/
d
125 +2, -0
85 +2, -0
e
150 +2, -0 2/
25 ±2
125 +2, -0
f
150 +2, -0 2/
g
h
25 +2, -2
1/ This temperature shall be considered as the reference temperature.
2/ For characteristic Q only.
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