MIL-DTL-23659F
amplitude of 100 ± 5 milliamperes. The initiator shall be temperature conditioned at 70° ± 5°F
for a period of 12 hours.
4.4.4. Minimum 50 Millisecond All-Fire Stimulus, Class A. To determine if the initiator
meets the minimum 50 millisecond all-fire stimulus requirement of 3.4.3.3, a direct current pulse
of not more than 5 amperes shall be applied to the bridge circuit. For an initiator having more
than one bridge, the current pulse shall be applied to one bridge circuit only. The test current
shall be a DC current pulse, regulated throughout the period of application, to within 2 percent of
the desired value. If a rectified current is used, the ripple content shall not exceed 5 percent rms
of the test current. The initiators shall be preconditioned at 70 ± 5°F, -80° ± 5°F, or at 225° ±
5°F as appropriate, (see Table I) for a period of 12 hours.
4.4.5. Maximum No-Fire Stimuli Class B
4.4.5.1. Power Current. To determine the maximum no-fire stimulus as required by
3.4.3.4.1, the bridge circuit shall be pulsed with current from the power supply (firing unit) of the
unit of intended application or with a current which simulates that current. One parameter of the
firing circuit, e.g. voltage, current, capacitance, etc., shall be chosen and shall be varied
according to the requirements of the statistical test used. In each case, the parameter varied shall
be adjusted to within 2 percent of the required value. For initiators having more than one bridge,
only one bridge circuit shall be pulsed with current. Initiators used for this test shall be
temperature conditioned for a minimum time of 12 hours at + 70 ± 5°F.
4.4.5.2. Static Discharge. To determine if the initiator meets the requirements of
3.4.3.4.2, a 500 ± 5 percent picofarad capacitor charged to 25000 ± 500 volts and 5000 ± 5
percent or a 500 ± 5 percent ohm resistor shall be connected in a 5 microhenry total inductance
series circuit between pairs of pins or leads in all combinations and between the shorted pins or
leads (all pins or leads shorted to each other external to the initiator) and the case of the initiator.
The series connection shall be maintained for 60 seconds. All of the initiators shall be tested
using the 5000 ± 5 percent ohm resistor, and then using the 500 ± 5 percent ohm resistor.
Switching in this circuit shall be accomplished by bringing together two 0.5 ± 0.05 inch spherical
metal electrodes from an initial separation of 3 inches in air. Each series test shall constitute a
separate test. Initiators used for this test shall be temperature conditioned for a minimum time of
12 hours at 70° ± 5°F.
4.4.6. Minimum 50 Millisecond All-Fire Stimulus, Class B. To determine the minimum
50 millisecond all-fire stimulus as required by 3.4.3.5, the bridge circuit shall be energized from
the power supply (firing unit) of the unit of intended application or from a source which
simulates that supply. One parameter of the firing circuit e.g. voltage, current, capacitance, etc.
shall be chosen and shall be varied according to the requirements of the statistical test used. In
each case, the parameter varied shall be adjusted to within 2 percent of the required value. For
initiators having more than one bridge, only one bridge circuit shall be energized. Initiators used
for this test shall be temperature conditioned for a minimum time of 12 hours at - 80° ± 5°F.
4.5. Bridge Circuit Resistance Subsequent to Actuation, Class A and B. To determine if
the initiator meets the requirement of 3.4.4, when applicable, all initiators which will be tested
according to the minimum 50 millisecond all-fire tests specified in 4.4.4 or 4.4.6 shall be
subjected to the following test: The bridge circuit resistance of each bridge circuit shall be
measured in accordance with MIL-STD-202, Method 302 using test condition B (500 volt ± 10
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