MIL-DTL-23659 Initiators, Electric, General Design Specification ForThis specification furnishes general requirements for design and establishes uniform methods for testing electric initiators and electric initiator subassemblies. The purpose of the testing program is to determine the electric characteristics, soundness of mechanical design, output, and resistance to deleterious service environments. For purposes of this specification the term electric initiator includes items classified in FSC 1377 such as hot wire initiators, exploding bridgewire initiators, exploding foil initiators, conductive mix initiators, etc. Electric primers are not covered in this specification. All requirements for in-line initiators used in safety sensitive, non-interrupted energetic materials train applications are contained in Appendix A. Requirements for all other initiators are in the main body of this document.

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MIL-DTL-23659F

3.4.3. Maximum No-Fire and Minimum 50 Millisecond All-Fire Stimuli.

3.4.3.1. General. For purposes of specifying maximum no-fire and minimum 50

millisecond all fire stimuli, initiators covered by this specification are divided into two Classes:

"Class A" and "Class B".

3.4.3.1.1. Class A. Includes any initiator that is capable of being actuated within one

second (exclusive of delay element time, if present) from a 28 � 2 volt source capable of

delivering not less than 10 amperes.

3.4.3.1.2. Class B. Includes any initiator that is not capable of being actuated within

one second (exclusive of delay element time, if present) from a 28 � 2 volt DC source capable

of delivering not less than 10 amperes.

3.4.3.2. Maximum No-Fire Stimuli, Class A

3.4.3.2.1. Power-Current. The initiator shall not fire within 5 minutes when subjected to

a current of 1 ampere minimum per bridge with an associated power of 1 watt minimum per

bridge. The initiator shall meet this requirement at 70� � 5�F and 220� � 5�F. The test method

shall be as explained in 4.4.3.1.

3.4.3.2.2. Static Discharge. The initiator shall not fire or dud when subjected to the

25000 volt simulated human electrostatic discharge of 4.4.3.2. The initiator shall meet this

requirement at 70� � 5�F and a relative humidity of 50 percent or less.

3.4.3.2.3. Stray Voltage. The initiator shall be capable of withstanding the effects of a

stray voltage environment without pre-igniting (firing). The initiator shall meet this requirement

at 70� � 5�F. The test method shall be as described in 4.4.3.3.

3.4.3.3. Minimum 50 Milliseconds All-Fire Stimulus, Class A. The minimum 50

millisecond all-fire stimulus as defined in 6.3.7 shall be measured as described in 4.4.4. The

initiator shall meet this requirement at 70� � 5�F, - 80� �5�F, and 225� � 5�F.

3.4.3.4. Maximum No-Fire Stimuli, Class B.

3.4.3.4.1. Parameter(s). The maximum no-fire stimulus as defined in paragraph 6.3.9

shall be determined as specified in paragraph 4.4.5.1.

3.4.3.4.2. Static Discharge. The initiator shall not fire or dud when subjected to the

25000 volt simulated human electrostatic discharge of 4.4.3.2. The initiator shall meet this

requirement at 70� � 5�F and a relative humidity of 50 percent or less.

3.4.3.5. Minimum 50 Millisecond All-Fire Stimuli, Class B. The requirements for the

minimum 50-millisecond all-fire stimulus as defined in 6.3.7 shall be as specified in 4.4.6.

3.4.4. Bridge Circuit Resistance Subsequent to Actuation Class A and B. If there is a

requirement that a fired initiator shall have a minimum open circuit resistance after firing, then

the cognizant Safety Authority shall specify the open circuit resistance requirement and the

method of test shall be that given in 4.5.

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