Downloaded from https://www.everyspec.com MIL-STD-1311D METHOD 1032A (Not normally applied to receiving tubes) 1. Purpose. This method contains test procedures for verifying the ability of electron tubes to perform satisfactorily under conditions of mechanical vibration. The test conditions should be chosen to reflect the capability of the tube. 2. General considerations. 2.1 Fixturing and control points. For each axis of vibration, the TUT shall be rigidly mounted on a suitable fixture that is free from mechanical resonance over the test frequency.
The test fixture shall not cause attenuation of the energy level exhibited at the platform using accepted standards of measurements for calibration of the shock level and time duration. The TUT may also be mounted directly on the vibration table. If a fixture is used, it shall be so designed as to transmit the acceleration along the required axis. The vibration input shall be monitored and controlled at a point on the fixture close to the attachment points of the TUT. 2.2 Tolerances. The following test parameters shall be maintained within the tolerance limits specified on the TSS.
VIBRATION, MECHANICAL Displacement ± 10 percent Acceleration ± 15 percent Frequency range limits ± 5 percent Sweep rates ± 5 percent Time durations ± 5 percent Axes of application ± 5 percent Electrical parameters See TSS 2.3 Test limits. Initial readings, operating conditions, and test limit(s) during and after mechanical vibration shall be specified on the TSS. 2.4 Axes of application. The vibration procedures specified on the TSS shall be applied along the X, Y, and Z axes of the TUT in any order. A drawing or sketch of the TUT showing the X, Y, and z axes shall form a part of the TSS. 3. Test parameters for sinusoidal vibration. 3.1 Simple harmonic motion.
The vibration applied to the control point shall be simple harmonic motion. 3.2 Frequency ranges. One of the following frequency ranges shall be used, as specified on the TSS: 5 to 25 Hz 10 to 60 Hz 10 to 150 Hz 10 to 500 Hz 10 to 1,000 Hz 10 to 2,000 Hz 10 to 5,000 Hz 3.3 Vibration levels. One of the following vibration levels shall be used, as specified on the TSS: METHOD 1032A 1032-1 19 April 1968 Total displacement in inches Crossover Acceleration Total displacement in mm Crossover .006 .012 .028 .060 .080 .120 .160 .280 57.0 57.0 59.0 57.0 60.5 57.0 60.5 59.0 1.0 2.0 5.0 10.0 15.0 20.0 30.0 50.0 0.15 0.3 0.7 1.5 2.0 3.0 4.0 7.0 57.5 57.5 59.5 57.5 61.0 57.5 61.0 59.5