Downloaded from https://www.everyspec.com MIL-STD-810D 19 JUIY 1983 METHOD 516;3 SHOCK .. SECTION II H-1 AwAMN.s ,. II-1.1 ~ 1. Apparatus I is used.for procedures 1, II, III, V, VII, and IX. 11-1.1.1 .1. . The shock-producing apparatue shall be capable of producing.the test conditions as determined aocording to the appropriate paragraph of section I of this method. The shock apparatus may be of the free fall, resilient rebound, nonresilient, hydraulic, compressed gae, electrody- namicsshaker, or other activating types. Procedure VII may require pyrotechnic devices to simulate field conditions. Procedures 11 and III.require test : apparatus capable of producing relatively large displacement.
II-1.1.2 @Li@&im. The shock apparatus will be calibrated for conformance with the specified test requirement from the selected procedure. Two consecutive shock applications to a calibration load shall be produced which satisfy the test conditions outlined in procedures 1, II, III, V, VII or IX. The calibration load shall then be removed and the shock teet will be performed on the actual test item. II-1.1.3 ~. The instrumentation used to measure chock pulees or ‘shock acceleration spectra.shall have the following characteristics. a. ~ (1) Transverse sensitivity of less than or equal to 5%.
(2) An amplitude linearity within 10% from 5% to 100% of the peak acceleration amplitude required for testing. (3) For procedures 1, 11, III, V and IX:. A flat frequency responee within 210$ across the frequency 5 - 2,000 Hz. (4) For procedure VII: A flat frequency response within 2101 across the frequency 20 Hz to the highest frequency specified in I-3.9. b. 7;, (1) ,Will not alias more than a 5 perCent measurement error intO the frequency band of interest. (20 Hz to 10 KHz typically.) (2) having linear If filters are used to meet the previous requirement, a filter .: phase-shift characteristics shall be used.
(3) the frequency With filter (if used), shall have a pass band within 1 dB across range specified for the accelerometer (see 11-1.1.3a). METHOD 516.3 19 July 1983. 516.+18