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Definitions (69)
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Ambient conditions
The conditions (e.g. temperature and humidity) characterizing the air or other medium that surrounds the UUT.
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Mechanical failure
A malfunction consisting of cracking, excessive displacement, misalignment, loosening, etc.
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Soft failure
A product under test ceases to operate correctly, but resumes correct operation when the stressing environment is eased. Also known as an intermittent failure. See hard failure. Note: All solid sate d [..]
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VHALT
Vibration HALT; the part of the HALT process using random vibration stress under ambient conditions
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Accelerated Stress Testing
A post-production activity on a sampling (initially 100%) of units. The intent is to precipitate hidden or latent failures caused by poor workmanship and to prevent flawed units from reaching the next [..]
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AGREE
A type of environmental test chamber designed to implement test procedures defined by the Advisory Group on Reliability of Electronic Equipment.
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Bandwidth
The frequency range in hertz (Hz) within which a measuring system can accurately measure a quantity.
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Burn-in
Continuously powering a product at constant elevated temperature, in order to accelerate the aging process. Most effective for semiconductor components; relatively ineffective for screening circuit bo [..]
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Degrees of freedom
In mechanics, the total number of directions of motion of an assembly being evaluated. E.g. a ship or aircraft experiencing linear motion up and down, fore-and-aft and left-and-right motions as well a [..]
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