MIL-PRF-123D
4.6.16 Moisture resistance (see 3.20).
4.6.16.1 Humidity, steady state, low voltage. Capacitors shall be tested in accordance with method 103 of MIL-
STD-202, condition A. The following details and exceptions shall apply. Note: At no time during test shall voltage
greater than 1.5 volts be applied to any capacitor under test.
a. Initial measurements: Capacitance.
b. Test: Capacitors shall be subjected to an environment of +85°C with 85 percent relative humidity for 240
hours minimum. Cycling shall not be performed. A dc potential of 1.3 ±0.25 volts shall be applied
continuously through a 100,000-ohm resistance to each device under test.
c. Final measurements: On completion of the above test, remove capacitors from the chamber and allow 3
hours, 30 minutes, ±30 minutes to dry and stabilize at +25°C before performing the insulation resistance
(IR), through a 100 kilohm resistor at 1.3 volts ±0.25 volts, and capacitance in accordance with 4.6.10 and
4.6.7, respectively.
d. Visual examination: After final measurements, the capacitors shall be examined for evidence of mechanical
damage and obliteration of marking.
e. Leads may be attached to chip capacitors for mounting and loading purposes. Mechanical loading is
acceptable.
4.6.16.2 Moisture resistance, normal voltage. Capacitors shall be tested in accordance with method 106 of MIL-
STD-202. The following detail and exceptions shall apply:
a. Initial measurements: Capacitance.
b. Number of cycles: 20 continuous cycles.
c. Tests: during the first 10 cycles only, a direct current potential of 50 volts shall be applied across the
capacitor terminals. Once each day a check shall be performed to determine whether a capacitor has
shorted. Vibration cycle of step 7b shall not be performed.
d. Final measurements and examination: On completion of step 6 of the final cycle, capacitors shall be
conditioned at 25°C ±5°C and a relative humidity of 30 percent to 60 percent for a period of 18 hours
minimum, 24 hours maximum, and shall be visually examined for evidence of mechanical damage and
obliteration of marking; capacitance, dielectric withstanding voltage, and insulation resistance at 25°C shall
e. Leads may be attached to chip capacitors for mounting and loading purposes. Mechanical holding is
acceptable.
4.6.17 Vibration, high frequency (leaded capacitors only) (see 3.21). 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 on a mounting fixture by the body. The leads shall be
secured to rigidly supported terminals, so spaced that the length of each lead from the capacitor is
approximately 0.375 inch (9.52 mm) when measured from the edge of the supporting terminals. Leads shall
be within 15° of being parallel. When securing leads, care shall be taken to avoid pinching the leads. The
mounting fixture shall be so constructed as to preclude any resonance within the test range. An examination
of the mounting fixture shall be made on a vibrator. If any resonant frequencies are observed, adequate
steps must be taken to damp the structure.
b. Electrical load conditions: During the test, a direct current potential equal to 125 percent of the direct current
rated voltage (see 3.1) shall be applied between the terminals of the capacitor element under test.
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