Downloaded from https://www.everyspec.com MIL-STD-1311D SHOCK, SPECIFIED PULSE 1. Purpose. The purpose of this test is to evaluate the ability of tubes to withstand specified shock levels in accordance with MIL- STD-202, method 213. 2. Apparatus, setup, and calibration. In addition to that specified in method 213, MIL-STD-202, the following shall be applicable: a. The TUT shall be rigidly mounted on a suitable fixture or directly on the shock table using the normal mounting arrangement for the tube. If a fixture is used, it shall be designed so as to transmit the shock along the required axis.
The shock input shall be monitored on the fixture at a point close to the attachment points of the tube. b. In addition to the conditions specified in method 213, MIL-STD-202, the following conditions may be applied: Peak value ........................................................................... 15 G Normal duration (D) ............................................................. 11 ms Waveform ............................................................................ Half-sine METHOD 1042B Velocity (V i ).......................................................................... 3.4 feet/second 3. Procedure.
The specified parameters of the tube shall be measured before and after shock. Unless otherwise stated, the tube shall be nonoperating while being shocked and tests shall be conducted only under ambient conditions. METHOD 1042B 1042-1 25 March 1970