EMC includes EMI(electromagnetism to disturb) reach EMS(electromagnetism to be able to bear or endure suffer a gender) two parts, alleged EMI electromagnetism is disturbed, carrying out for machine itself therefore the electromagnetism noise; that goes against other system should be produced in the process that has a function and EMS shows the machine is being carried out therefore due do not suffer in functional process all round the ability that electromagnetism environment affects.