MIL-PRF-39001E
4.7.9.2 Vibration, random. Capacitors shall be tested in accordance with method 214 of MIL-STD-202. The
following details shall apply:
a. Mounting: Body of the capacitors shall be rigidly supported.
b. Test condition: E of table 214-II of MIL-STD-202.
c. Duration and direction of motion: 1 hour 30 minutes in each of three mutually perpendicular directions (total
of 4 hours 30 minutes).
d. Measurements: During the last 30 minutes in each direction, an electrical measurement shall be made to
determine intermittent contacts, or open-circuiting or short-circuiting. Detecting equipment shall be
sufficiently sensitive to detect any interruption of 0.5 ms or greater duration.
e. Examination after test: Capacitors shall be examined for evidence of mechanical damage.
4.7.10 Temperature coefficient and capacitance drift (see 3.14).
4.7.10.1 For qualification inspection. Capacitance measurements shall be made in accordance with 4.7.6 (a
frequency of 100 kHz ± 10 percent may be used as an alternate) at the following temperatures in the order listed:
Step
Step
Temperature C
Temperature C
1
25 ±2
6
45 ±2
2
-55 +0, -2
7
65 ±2
3
-40 ±2
8
+85 +2, -0
4
-10 ±2
9
125 +2, -0
(For temperature ranges O and P)
5
25 ±2
10
150 +2, -0
(For temperature range P)
11
25 ±2
The measurement at each temperature shall be recorded when two successive readings taken at 5-minute intervals
at that temperature indicate no change in capacitance. An accuracy of ±0.025 percent of nominal capacitance +0.05
pF shall be maintained for measurement of capacitance change.
4.7.10.1.1 Temperature coefficient. The temperature coefficient shall be computed as follows:
(Cx C5 )106
TC
(T T
)C 5
2
1
Where: T
=
C
Temperature coefficient in ppm degree centigrade.
Cx =
Capacitance at test temperature in pF.
C5 =
Capacitance at step 5 temperature in pF.
=
25C
T1
T2 =
Test temperature in degrees centigrade.
4.7.10.1.2 Capacitance drift. Capacitance drift shall be computed by dividing the greatest single difference
between any two of the three values recorded at 25C by the step 5 value recorded at 25C.
4.7.10.2 For quality conformance inspection. Capacitance measurements shall be made as specified in 4.7.10.1,
except that measurements shall be made only for step 1, step 2, step 5, step 9, or step 10, as applicable, and step
11.
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