MIL-DTL-81530B(OS)
TABLE I. Production tests and inspections.
Item
Nature of Test
Requirement
Test
Classification
(DOD-STD-2101)
Primary Component
Single Batch Verification
3.3
4.3.3
(M101)
Primer Composition
Moisture Content
3.5
4.6.1
(C1)
Primer Composition
Drying Verification
3.5
-
(M102)
Inner Cup and Electrode
Insulation Resistance
3.6
4.6.2
(M103)
Assembly
Bridgewire Assembly
Decomtamination
3.7.1
4.6.3
(C2)
Igniter Assembly
Loading Verification
3.8
-
(C3)
Igniter Assembly
Drying Verification
3.8
-
(M104)
Ignition Element
Visual Inspection
3.9.1
4.6.5
(M105)
Ignition Element
Bridgewire Resistance
3.10
4.6.4
(C4)
Ignition Element
No-Fire
3.11.1.1
4.6.6.1
(C5)
Ignition Element
All-Fire
3.11.1.2
4.6.6.2
(C6)
Ignition Element
Functioning
3.11.2
4.6.7
(C7)
4.6 Tests.
4.6.1 Determining moisture content. Transfer approximately 2.0 grams of the primer composition
from the representative sample to a tared weighing dish, weigh to the nearest 0.1 milligram, calculate the
weight of the sample, transfer weighing dish and sample to a vacuum drying oven, dry at +71bC ± 2bC
and 28±2 inches of mercury vacuum until constant weight is obtained. The loss of weight is calculated as
the percentage of moisture in the original sample.
4.6.2 Insulation resistance. Prior to assembly of the bridgewires, the insulation resistance shall be
checked with an applied voltage of 500±25 volts d.c. This measurement shall be made between the
electrode and the inner cup. Units which fail to meet the requirements of 3.6 shall be rejected.
4.6.3 Bridgewire assembly, decontamination. Before filling the cavity around the bridgewire with the
ignition compound, the bridgewire sub-assembly shall be thoroughly cleaned to remove solder flux and
contamination. Ultrasonic cleaning technique is recommended. Inspection for contaminates shall follow
cleaning process.
4.6.4 Bridgewire resistance. Conformance with the bridge circuit resistance of 3.10 shall be
ascertained by means of a test circuit which limits the bridge current to 25 milliamperes, maximum. A
safety chamber with an interlock switch shall be used to protect the operator during the application of
current. Instrumentation which is known to be accurate within 1% in the range of resistance specified
shall be used to determine whether or not the requirement is being met. Units which fail to meet the
requirements of 3.10 shall be rejected. The results of bridge circuit resistance measurements shall not be
affected by resistance of the test circuit.
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