The MIL-STD-331D Department of Defense test method standard: fuses, fuse safety devices, and other related components, environmental and performance testing, developed by the United States Department of Defense, describes the test methods used by the United States Department of Defense to determine the safety, reliability, and performance characteristics of weapon firing systems, fuse safety devices, and other related components at any stage in their life cycle.
Unless otherwise specified, all measurements and tests should be performed at ambient temperature, pressure, and relative humidity. When these conditions must be controlled to obtain repeatable results, a reference temperature of 23 degrees, atmospheric pressure of 760 millimeters of mercury, and relative humidity of 50 percent should be used with the tolerances necessary to obtain the desired accuracy of measurement. Actual test conditions, whether controlled or not, should be recorded throughout the test period.
Unless otherwise specified, the test apparatus shall be installed, mounted, connected or located in the test equipment in a manner that simulates service use. If fastenings or adaptors are required, they shall be designed to simulate the same. Plugs, covers, plates, cables and accessory apparatus used in service shall remain in place. When the test apparatus does not use mechanical or electrical connections, the connections shall be provided with the same amount of protection as would normally be provided during service use. Unless otherwise specified, the maximum allowable tolerances of the test conditions, excluding the accuracy of the instruments, shall be as follows:
Unless otherwise specified, preconditioning or stabilization is not required. When preconditioning is required, conditions shall be established and brought to the specified level and duration, at which point testing shall commence. When stabilization is required, conditions shall be maintained at the specified level and duration. Checking or adjusting the operation of test equipment shall be minimized at any time while the test apparatus is plugged in or on. If time is a factor in the performance or life of the test apparatus, that period shall be considered part of the test period.
The individual test detailed requirements are included in the annexes to this standard. The format of each test is standard. Each test consists of seven parts. The first five parts are mandatory for compliance with the MIL-STD-331 standard.
Tests are grouped according to the environment to which the fuse is exposed or the purpose of the test. Some tests combine two or more environments, such as vibration in the event of exposure to extreme temperatures. In these cases, the test is grouped according to the primary environment evaluated. The test groups are as follows:
The tests described in this standard have been developed over the years by fuze designers and users. Although they were developed based on functional aspects specific to fuzes, many of the tests have been specified in the development and procurement of other ammunition components and test equipment.
The test methods described in the annexes of the MIL-STD-331D standard are:
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