Downloaded from https://www.everyspec.com MIL-STD-81OD 19 JuIY.1983: a transient For o (1) The shock apparatus shall.be that meets or exceeds the required spectral comparabilityy or repeatability, the shock response spectrum of the transient capable of producing or pulse amplitude. should not exceed the test condition by more thanA3.5 dB for procedures 1, V and IX and 6.0 dB for procedure VII (dB = 20 log - ). Ao II-1.2 ~. The drop tester used to conduct procedure IV (Tranait Drop) teata ,shallbe capable of producing the required impacts to the test item(s). . 11-1.2.1. mt facility.
Drops for equipment mass up to 454 Kg (1000 pounds) and having its largest dimension less than 91 cm (36 inches) shall be made from a quick-release hook,,or drop tester. The floor or barrier receiving the impactshall be of two-inch plywood backed by concrete. For equipment over 454 Kg, the floor or barrier shaU be concrete. 11-1.’2.2 CQn!m2Q. Controls shall be adequate to assure that teStinE ia, conducted as specified in table 516.3-II. 11-i.3 &ratua 1~ .Tti,e platform used for performing procedure VI tests (bench handling) shal~.“b,ea solid wood bench top at least 4.25 cm (1.67? inches) thick. 11-1.4””AQRaraM=IY 11-1.4.1 lest facl Itv .1.
The following equipment will be necessary to perform the ‘Failimpact test (p;.?cedureVIII). a. Two ordinary railroad cars, equipped with a draft gear coupling that will be used during shipment. b. A prime mover for moving ‘the cars. 11-1.4.2 Q.2ntro1s. The followirigare minimum test”control “requirements. a. A calibrated means to determine that the speed at the time of impact is””13, 14.5, or 16.2 Km/hr (eight, nine or ten miles per hour), within ? five percent. ,,, b. Accelerometers and associated circuitry to measure the impact, shock, and equipment response, if these measurements are specified. . II-2 II-2.1 Preli ~rv m stem.. Prior to iriitiitingany testing: .a.
,Choosethe appropriate test procedures (paragraph I-3) .i b. Determine the shock levels for the procedures chosen. II-2.2; lretest checkout. All items require a pretest checkout,at standard ambient conditions to provide baseline data. Conduct the checkout as follows: Step 1. Conduct a complete visual examination of the test item with special attention to stress areas. METHOD’51”6.3 516.3-19 19 JUIY 1983