Downloaded from https://www.everyspec.com AMCP 706-196 TABLE 6.2 (Corn'd) ENVIRONMENTS AND TYPICAL EFFECTS' Environment Etffacts Interference with f unction; can cause contamination of lubricants and ' other substances. Magnetic filids False signals are Induced In electrical and electronic equipment,,I Interfered with cerLain functions; can Induce hesting, can altar* electrical properties. Insects Can cause surface damage and chemical reactions; can cause clogging and hozo, etc. precipitation, etc.; enhances contamination; can act as an Insulator or attenuator of radiated energy.
' Clouds, fog, smog, smoke, Can Interfere with optical and visual measurements,, deposition of moisture, Acoustic noise Vibration applied with sound waves rather than with a mechanical couple, caih cause the some damage and results as vibrational environment, ie., the sound energy excites structures to vibrate. TABLE 6.3 ILLUSTRATION OF INTERACTING ENVIRONMENTAL EFFECTS' Salt Vibration Low High Spray _______ Temperature Temperature High Accelerate Increase Rate Mutually Temper ature Corrosion of Wear Exclusive Low Decelerate Intensity, Temperature Corrosion Fatigue, Vibration iNteto n __________ ________ -Rupture, etc.
Salt Spray * ature inhibits the growth of' fungi and rain Some conditions cause cumulative non- dilutes the cotrosive effects of so": pray. 'vcrsible changes In the equipment; there- A good tabulation of irany environmental fore, when considering equipment behavior, factors and equipments Is presented in the history cof environmental exposures must Refs. 2 and 5. be considered. For eyanple, heating from welding and soldering can cause permanent A less frequent effect occurs when one shifts in device characteristics; mnechancal etwironivental condition creates anothet, e.g., shock can result In permanent dislocation of Y ..
when arcing between switch or relay con- a lead or a part; and nuclear radiation can tacts causes the formation of ozone, thus cause permanent defects In semiconductor changing the environment and its effects. devices. The need for cornditioning items