MIL-STD-662F
that the projectile passing through the screen will "break" the circuit. Chronograph or electronic timers used shall be calibrated and certified for accuracy. If accuracy is not certified, two pairs of velocity screens and two chronograph counters shall be used. This system enables the computation of an average projectile velocity between each pair of screens. The difference between the two instrumentation velocities shall be less than or equal to l0 ft/s (3 m/s); thus, giving greater accuracy in actual average velocity.
4.3.3 Radar. Doppler radar is used occasionally to check lumiline screens.
4.4 Propellant. Any propellant which is either standard or suitable for the weapon shall be used. A projectile velocity-propellant charge curve for the weapon shall be determined before any testing is performed. This curve is required to provide a basis for selecting a powder charge to achieve a desired velocity. It is recommended that the propellant storage and weighing area be maintained at 19-24oC (65-75oF) and 50 + 5% relative humidity.
4.5 Test sample mount. The armor test sample shall be secured on the test target mount with impact side perpendicular to the line-of-flight of the projectile. The frame supports and clamps or mounting fixtures must be capable of retaining the sample and withstanding shock resulting from ballistic impact by the test projectiles. The test sample mount shall be capable of adjustment for moving the sample in the vertical or horizontal directions so that the point of impact can be located anywhere on the sample, and so that zero degree obliquity impacts can be achieved anywhere on the sample. The test sample mount shall be able to rotate on the vertical or horizontal axis so that various obliquity attack angles can be achieved. The test samples shall be mounted with a rigidity equal to or greater than the actual installation of the part.
4.6 Test sample. The sampling plan for ballistic acceptance tests shall be specified in the contract.
5. DETAILED REQUIREMENTS
5.1 Test conditions. Unless otherwise specified, all ballistic tests shall be performed in a standard atmosphere of 23 + 2oC (73 + 4oF) and 50 + 5% relative humidity. Temperature and humidity measurements shall be recorded for each firing.
5.2 Equipment setup.
5.2.1 Triggering devices. The spacing from the weapon muzzle to the first pair of triggering devices shall be sufficient to prevent damage from muzzle blast and obscuration from smoke in case optical devices are used. Recommended distances can
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