MIL-DTL-81530B(OS)
4.6.5 Visual inspection. Examine each ignition element and reject for chips, burrs, cracks, split or
perforated closure disc or for any other imperfections which would harmfully affect either assembly or
functioning.
4.6.6 Electric sensitivity tests.
4.6.6.1 No-fire test. The number of ignition elements selected from each production lot for the no-fire
test shall be in accordance with the requirements of table I of ANSI/ASQC Z1.4, Inspection Level 1.
Each ignition element shall be conditioned at +70bF ± 5bF for a period 1 hour longer than that required
to reach thermal equilibrium and tested in the firing test fixture, DL 613457. The firing circuit shall
contain a resistor in series sufficient to regulate the current to 2.0 amperes measured to within an
accuracy of 1.0%. This current shall be applied to the ignition element for a period of not less than 1
minute nor more than 1.1 minutes. An ignition element which fires shall be considered defective and
shall cause rejection of the lot represented.
4.6.6.2 All-fire test. The number of ignition elements selected from each production lot for the all-fire
test shall be in accordance with the requirements of table 1 of ANSI/ASQC Z1.4, Inspection Level I. The
ignition element shall be conditioned at +70bF ± 5bF for a period 1 hour longer than that required to
reach thermal equilibrium and fired in the test fixture, DL 613457. The firing circuit shall contain a
resistor in series sufficient to regulate the current to 3.0 amperes measured to within an accuracy of 1.0%.
Any ignition element which fails to fire within 100 milliseconds after current application shall be
considered defective and shall cause rejection of the lot represented. As a precaution against obtaining an
apparently defective ignition element due to high internal circuit resistance of the ignition element, it is
recommended that the resistance of each ignition element be measured prior to conducting the test.
4.6.7 Functional test. The number of ignition elements selected from each production lot for the
functional test shall be in accordance with the requirements of table I of ANSI/ASQC Z1.4, Inspection
Level II. The ignition element shall be conditioned at +70bF ± 5bF for a period 1 hour longer than that
required to reach thermal equilibrium and fired in the firing test fixture, DL 613457. In addition to the
sample of ignition elements required for the test of 4.6.7, 10 additional ignition elements shall be
furnished from the production lot for investigative purposes.
4.6.7.1 Criteria of acceptability.
4.6.7.1.1 Response time and output. Each ignition element shall be mounted in the firing test fixture,
DL 613457, and the firing circuit shall contain a resistor in series sufficient to regulate the current to 5.0
amperes measured to within an accuracy of 1.0 percent. The firing interval between the application of
current to the ignition element and the detection of explosive discharge (firing) shall be measured using
an electronic timer or equally responsive instrument accurate to 1.0 percent. The timer is activated by an
applied pulse to the ignition element and is stopped by photocell pickup of the explosive discharge of the
double base propellant, Drawing 838AS100. The 0.008 inch thick brass diaphragm, Drawing 2302112, is
used to measure the output, shall be located 2.810±015 inches from the face of the ignition element's
closure disc when assembled in the test fixture. The 0.080 gram of double base propellant, Drawing
838AS100, shall be loaded in the test fixture as prescribed in DL 613457. Any ignition element which
fails to meet the requirements of 3.11.2 shall be considered defective and shall cause rejection of the lot
represented.
4.7 Retest. There shall be no retests.
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