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MIL-STD-202 is a U.S. military standard for electronic devices that covers a variety of test methods. The high frequency vibration test is specifically designed to evaluate the reliability and durability of equipment in high frequency vibration environments. The core purpose of this test is to ensure that the equipment can withstand vibration in a specific frequency range and maintain normal function under these conditions, identifying potential failure modes such as solder joint failure and component loosening. The frequency range of high frequency vibrations is typically 10-500 Hz, 10-2,000 Hz, or 10-3,000 Hz. These frequencies are commonly found in military equipment such as aircraft, missiles and tanks.
In the high frequency vibration shaker, samples will be tested under power failure or specific load conditions, subject to the vibration amplitude, frequency range and duration set. These parameters will provide a comprehensive evaluation of the performance and durability of the sample.
The sample should be subject to simple harmonic vibration and its amplitude should be 0.06 inches double amplitude or 10 gravity units (g peak), whichever is smaller. The tolerance of the vibration amplitude should be within the range of ±10% to ensure the accuracy of the test.
The vibration frequency should vary logarithmically between 10 and 500 Hz, meeting the approximate limit. However, Method 201 is suitable for a range of vibration frequencies in the 10-55 Hz frequency band to ensure the validity of the test.
The entire frequency range of 10-500hz and returning 10hz should be traversed in 15 minutes. This cycle should be done 12 times in each of the three perpendicular directions (36 times in total), so the entire cycle of movement is about 9 hours. Interruptions are allowed as long as the requirements for the rate of change and duration of the test are met. The ride can be completed in either band before moving on to the next. When the procedure of this Standard Method 201 is used in the 10 to 55hz band, the duration of that part should be the same as the duration of that band using a logarithmic cycle (approximately 1-1/3 hours in each of the three mutually perpendicular directions).
The sample will experience a simple harmonic vibration with an amplitude of either 0.06 inches double amplitude or 15g (peak), whichever is the minimum. The tolerance of vibration amplitude is ±10%.
The vibration frequency should vary logarithmically between 10 and 2,000 Hz, meeting the approximate limit. However, method 201 is suitable for a range of vibration frequencies in the 10-55 Hz frequency band.
Over the entire frequency range from 10 to 2,000 Hz, including back to 10 Hz, the cycle should be completed in 20 minutes. Each direction is executed 12 times, for a total of 36 times, lasting about 12 hours. Interruptions are allowed as long as the requirements for the rate of change and duration of the test are met. The loop can be completed in any individual frequency band before moving on to the next band. For the 10 to 55 Hz band, the duration should match the duration of the band, using a logarithmic cycle of about 1-1/3 hours in each direction.
Samples shall be tested in accordance with Method 201 of this standard for a duration of 6 hours, 2 hours in each of the three mutually perpendicular directions.
The sample shall be subjected to simple harmonic motion. The amplitude of this motion must vary to maintain a constant peak acceleration of 10g (peak). The frequency varies logarithmically between the approximate limit of 55 to 2,000 Hz. The entire frequency range from 55 to 2,000 Hz (without flyback) should be traversed in 35 ±5 minutes.
However, near the resonance point, the above rate may decrease. This is to facilitate the establishment of resonant frequencies. If resonance is detected, the sample is vibrated for 5 minutes at each critical resonance frequency observed.
This procedure should be carried out in three mutually perpendicular directions. Interruptions are allowed as long as the requirements for the rate of change and duration of the test are met.
The sample will experience simple harmonic vibration and the amplitude will be maintained at 0.06 “double amplitude or 20g (peak), whichever is smaller. The tolerance of vibration amplitude is ±10%.
The vibration frequency should vary logarithmically between 10 and 2,000 Hz, meeting the approximate limit. However, Method 201 is suitable for a range of vibration frequencies in the 10 to 55 Hz frequency band.
Over the full frequency range of 10 to 2,000 Hz, including a return to 10 Hz, a cycle should be completed in 20 minutes. Each direction should be performed 12 times (36 times in total) for a total duration of approximately 12 hours. Interruptions are allowed as long as the rate of change and test time requirements are met. The loop can be completed in any individual frequency band before moving on to the next band. For the 10 to 55 Hz band, the duration should be equal to the duration of the band. Using a logarithmic cycle, about 1-1/3 hours in each direction.
There are four other types of MIL-STD-202 vibration test conditions that are not listed. If you would like to know more about MIL-STD 202 high frequency vibration testing conditions, please submit the form below for more information. We will be happy to provide you with professional answers and ensure that you have the comprehensive guidance and support you need.
