1. Scope of application: This standard specifies test methods I, II and III for the determination of the durability of electronic components ( hereinafter referred to as components ) subjected to vibration during transport or use.
Â Â Note: Test method I is suitable for determining the durability to general vibrations. Test method II is applicable to the determination of the resonance point and the offset of the resonance points before and after the test methods I and III. Test method III is applicable to the determination of the durability at the resonance point.
2. Device: The vibration device shall be capable of performing various tests as shown in the table and meet the following conditions.
( 1 ) Vibration waveform and distortion rate: The vibration waveform applied to the test sample is sine wave, and the reserve wave rate of the vibration acceleration waveform for the test object mounting position should be 25% or less.
( 2 ) Vibration amplitude : The allowable amplitude difference of the vibration direction must be within Â± 15% of the specified value .
( 3 ) Vibration perpendicular to the specified direction of vibration: For the vibration of the specimen at the installation position of the test specimen, the amplitude of the vibration should be 25% or less of the specified direction, regardless of the direction .
(4) Tolerance oscillation frequency: 50Hz to hereinafter as Â± 1Hz, 50Hz should be of more than Â± 2%.
( 5 ) Scanning ( 1 ) Method: The principle is for logarithmic scanning, but the average scanning is also possible.
Â Â Â Â Â Â Â Note: ( 1 ) 1 scan, for example, 10 - 55 - 10 Hz , refers to the frequency of one reciprocation in the specified vibration frequency range .
3 , ready
3 . 1 The installation of the test sample: The test sample shall be mounted on the vibration table directly or using a jig according to the method specified in the assembly standard. When using the fixture, it must be able to apply vibration in the direction specified by the standard of the component. The fixture should have enough mechanical strength and must not loosen or resonate after installation. The component standard should specify any of the following installation methods.
Â Â Â Â Â Â Â ( 1 ) Fix the assembly body ( wired assembly, also fixed wire ) .
Â Â Â Â Â Â Â ( 2 ) Only fix the wire.
4 , test
4 . 1 Pre-treatment: In principle, no pre-treatment. But when there is special need, according to the provisions of the component standards.
4 . 2 Initial measurement: According to the provisions of the component standards, check the appearance.
4 . 3 test methods: according to the following implementation. If the device generates magnetic conductance and the test object is susceptible to magnetic fields, its maximum allowable value shall be specified in the assembly.
Â Â Â Â Â Â Â 4 . 3 . 1 Test method type: The test method is divided into I ( scanning durability test ) , II ( resonance point shift detection test ) and III ( resonance point durability test ) three.
( 1 ) Test method I ( scanning endurance test ) : According to the provisions of the component standards, according to the following table ( refer to the figure ) .
In principle, the vibrations are applied in the direction perpendicular to each other. The test time is the same in all directions, for a total of 6 hours.
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â table
Â Â Â Â Â Â Vibration type
Vibration frequency range
10 to 55Hz
100 to 500Hz
10 to 2000Hz
Full amplitude or acceleration
1 . 5mm
1 . The smaller of 5mm or 98m/s2 ( 10G )
1 . The smaller of 5mm or 196m/s2 ( 20G )
About 1 minute
10-500-10Hz about 15 minutes
10-2000-10Hz about 20 minutes
Logarithmic or average scan
( 2 ) Test method II ( Resonance point shift detection test ) : This test is based on 4 . 3 . 1 ( 1 ) and 4 . 3 . 1 ( 3 ) Before and after the test to detect the resonance frequency of the test sample. The amplitude at the time of resonance detection is the same as that of the scanning endurance test. However, if the amplitude is reduced, the vibration characteristics can be more accurately detected. The amplitude can be reduced.