描述
CK11CE300 AC220V600A
靜電放電(ESD)和電快速瞬變脈沖群(EFT)對儀器儀表系統(tǒng)會產(chǎn)生不同程度的危害。靜電放電在5~200MHz的頻率范圍內(nèi)產(chǎn)生強烈的射頻輻射。此輻射能量的峰值經(jīng)常出現(xiàn)在35MHz~45MHz之間發(fā)生自激振蕩。許多信息傳輸電纜的諧振頻率也通常在這個頻率范圍內(nèi),結(jié)果電纜中便串入了大量的靜電放電輻射能量。電快速瞬變脈沖群也產(chǎn)生相當強的輻射發(fā)射,從而耦合到電纜和機殼線路。當電纜暴露在4~8kV靜電放電環(huán)境中時,信息傳輸電纜終端負載上可以測量到的感應(yīng)電壓可達到600V,這個電壓遠遠超出了典型數(shù)字儀器儀表的門限電壓值0.4V,典型的感應(yīng)脈沖持續(xù)時間大約為400納秒。
儀器儀表在使用中經(jīng)常會遇到意外的電壓瞬變和浪涌,從而導(dǎo)致電子設(shè)備的損壞,損壞的原因是儀器儀表中的半導(dǎo)體器件(包括二極管、晶體管、可控硅和集成電路等)被燒毀或擊穿。據(jù)統(tǒng)計儀器儀表的故障有75%是由于瞬變和浪涌造成的。電壓的瞬變和浪涌無處不在,電網(wǎng)、雷擊、爆破,就連人在地毯上行走都會產(chǎn)生上萬伏的靜電感應(yīng)電壓,這些,都是儀器儀表的隱形致命殺手。因此,為了提高儀器儀表的可靠性和人體自身的安全性,必須對電壓瞬變和浪涌采取防護措施。
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主營DCS系統(tǒng)配件
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