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目前显示的是 八月, 2019的博文

IP code system-the second characteristic numerals

IP code is a system to indicates the protection provided by enclosure against access to hazard parts, ingress of solid foreign objects, ingress of water and so on. Refers to IEC60529, the second characteristic numerals indicates the degrees of protection against ingress of water, and show as numerals from 0 to 8. Omitting first characteristic numerals, the degrees of waterproof can be show as below: IPX0: no protection IPX1: protected against vertically falling water drops. IPX2: protected against vertically f all water drops when enclosure titled up to 150. IPX3: protected against spraying water.  IPX4: protected against splashing water.  IPX5: protected against water jet. IPX6: protected against powerful water jet. IPX7: protected against the effects of temporary immersion in water. IPX8: protected against the effects of continuous immersion in water.  The test for IPX1 and IPX2 are made with a drip box which produces flow of water drops over th...

IP code System-First characteristic numerals

IP code system is given by IEC60529, which indicates the degrees of protection provided by an enclosure against access to hazardous parts, ingress of solid foreign objects, ingress of water and to give additional information in connection with such protection. IP code system is consisted by code letters(IP, international protection), first characteristic numeral ( 0 to 6 or letter X, indicates protection degrees against access to hazardous parts and solid foreign objects), second characteristics numeral (0 to 8 or letter X, indicates protection degrees against ingress of water), additional letters (A to D, optional) and supplement letters(H,M,S,W). Generally, the additional letters and supplement letters can be omitted, the first and second numerals can be replaced by X if without the characteristic.  The first characteristic numeral implies two meanings:  1. Enclosure provides protection of persons against access to hazardous parts by preventing or limiting the ingress...

What is EMC?

EMC (Electro Magnetic Compatibility) is ability of an equipment or system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment. Thus, EMC includes to two aspects: one is the electromagnetic interference caused by equipment during the normal operation can not exceed a certain limit for that environment; the other side is appliance shall has capacity of resisting disturbance to electromagnetic environment, that is Electromagnetic susceptibility.  EMC includes EMI (interference) and EMS (susceptibility). EMI (electromagnetic interference) describes the electromagnetic disturbances caused by electric and electronic appliances in normal operation to environment, which includes CE (conduction emission), RE (radiation emission) and harmonic tests. EMS (electromagnetic susceptibility) describes if the electric and electronic equipment will be disturbed by other appliance in same circu...