MIL-PRF-23419/12E
Vibration, high frequency: Fuses shall be tested in accordance with method 204 of MIL-STD-202. The
following details and exceptions shall apply:
a. Mounting: Fuses shall be mounted with their bodies restrained from movement, on an
appropriate mounting fixture.
b. Test level: Sinusoidal vibration from 5 to 3,000 hertz, 0.4 inch double amplitude or 30 g's peak,
whichever is less. (Method 201 of MIL-STD-202 is not applicable).
c. Sweep rate: Approximately one-half octave per minute.
d. Test duration: 12 hours total (4 hours in each of three major axis).
e. Loading during testing: Rated dc current on 50 percent of fuse samples tested.
f. Measurements: DC resistance measurements shall be taken before and after the vibration
exposure.
Shock: In accordance with method I of MIL-PRF-23419, except test condition F. Fuses shall be
mounted by their normal mounting means, with their bodies restrained from movement, on an
appropriate mounting fixture.
Thermal shock: In accordance with MIL-PRF-23419, except test condition B shall apply.
Burn-in (168 hours): Fuses shall be mounted by their terminals in sockets. Spacing between each fuse
shall not be less than .250 inch (6.35 mm) or greater than 1.00 inch (25.4 mm). Fuses shall be
electrically connected to a constant dc source supplying rated current to each fuse. Initial voltage drop
measurements shall be taken after current has been applied for a minimum of 2 hours but not longer
than 4 hours. Current shall be applied for 168 +4, -0 hours while at room ambient conditions. Forced
air shall not flow over the fuses during the burn-in period. The voltage drop of each fuse shall be
measured after the burn-in period with the voltage drop change determined from measurements taken
before the thermal shock test. The voltage drop change for each fuse shall be less than ±10 percent.
Terminal strength: Method 211 of MIL-STD-202, test condition A (5 pounds pull) applying the force
axially to each wire individually, then test condition C (1 pound force) applying three bends to each wire
terminal. The DC resistance of each fuse shall be measured before and after testing in accordance
with MIL-PRF-23419. The change in resistance shall not exceed ±10 percent from the initial value.
Resistance to soldering heat: Method 210 of MIL-STD-202, test condition B. Depth of immersion to be
between .020 and .050 inch (0.51 and 1.27 mm) from the base for the fuse case. The DC resistance of
each fuse shall be measured before and after testing in accordance with MIL-PRF-23419. The change
in resistance shall not exceed ±10 percent from the initial value. The formation of solder balls in the
lead egress area shall not be considered reason for rejection.
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