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from intermittent circuits to the failure of safety-critical systems can occur. The short-term effects of shock can be countered by choosing a connector with a robust locking system. Many connectors employ a screw-locking system, but under certain conditions sustained vibration at specific frequencies can shake screw threads loose. Bayonet-locking devices such as those found on radio-frequency (RF) connectors offer resistance to shock, as they cannot be undone by sustained vibration. The latch design fitted to the popular RJ45- style connector is another ideal solution for applications that experience shock. The long-term effects of vibration can be reduced by choosing specific materials. Connectors with stainless steel shells of housing are designed for high- reliability applications. The material of the electrical contacts also provides key benefits for reliability. Many connectors use brass as the base material for contact design, but sustained exposure to vibration can cause damage. Alternative materials such as beryllium copper offer superior strength and resistance to wear, resulting in a connector with a longer operational lifespan. Electromagnetic Interference The modern world is filled with electromagnetic energy, sometimes known as RF radiation. Some RF transmissions are created intentionally, as wireless communications rely on RF to carry data, while others are unintended. The link between electrical current and RF radiation means that almost any electrical equipment can be the source of radiation and therefore has the potential to interfere with the correct operation of other devices. C h a p t e r 3 | U n s e e n H a z a r d s – S h o c k , V i b r a t i o n , a n d E l e c t r o m a g n e t i s m We follow simple and reliable strategies to mitigate the dangers of harsh environments: utilize high-quality sealing materials and coatings for dust and chemical protection, select materials that resist corrosion and radiation, and design robust enclosures to minimize mechanical stress." Nida Qamar Electrical Engineer, Powertech 16 Understanding Harsh Environments for Electronic Design