The standard interpr謝那etation of
1 standard
Combined with the general s大中tandard of heavy industrial products東吧, electric power monitor放熱ing instrument for power to meet議風 the needs of EMS, EMI 學山and grade is shown in figure 1.
2 standard interpretation Int志秒erference is usually divided into tw用科o kinds of interfer雪家ence and transient interfere訊站nce. Such as mobile phone, wa畫放lkie talkie, radio sign嗎鐘al to interference. Because the swi金家tch, motor braking power fluctua著冷tion caused by such interfe身票rence, we called the transient inter朋大ference. Contains the tr分公ansient interference fig見也ure 1: surge SURGE, static ESD, electri場唱cal fast transient EFT/B, voltage di化電ps, short interrupt她房ions and voltage varia問畫tions include: DIPS; interference co分玩nduction sensitivity CS視好, RS sensitivity to ra店爸diation.
Evaluation of the class河信 A of the &ldquo &rdquo花關 does not decrease;事體 performance; namel制家y, applying interferenc了月e, no hardware damage, data reduction,吃分 no crashes, dropped frames 海還or bit error rate i音黑s higher in the process of applying int舊靜erference, as ap女資plied to the pro分煙ducts without in來鄉terference. Usually persistent d時厭isturbance evaluation gra音你de are the eval長間uation grade. The tr能技ansient interference 人費for incidental, grid distur術務bance caused by tim煙可e and reduce the time is n身在ot long, the perfo音刀rmance, also is the e音物valuation grade B.
3 EMS test items and i吧低nterference analysis 裡街of
(2) the static ESD: waveform r鐵新ise time is 0.7 這關1ns, the pulse is a草分 pulse width of 現輛dozens of NS, because of i村店ts peak voltage is in the 藍問range of thousands of volts, so the pul站通se also has a certain energy, to do pro理喝tection in port. Due to the rising edg票技e is very steep, so火生 the high frequency舞都 harmonics carrying 空道is very rich, up to 500MHz, so the stat林上ic electricity in all exposed 答學metal parts instrument東著 (including the terminal scre光快ws, etc.) contact dischar媽通ge or aperture (including opening, LED 樂了indicator of the various thermal an開湖d observation hole), or o銀科n the level of co愛微upled plates respectively弟報. And the vertical coupled plate務他 indirect discharge, will form a high-f你志requency electric field in the disch生雪arge point of ins技畫tantaneous, through the space in生家terference on th和厭e circuit, the in新金terference is the com森白mon mode interferen嗎器ce. Therefore, the static design s妹答hould pay attention to the protection的吧 and space port 東美high frequency radiati農站on of two aspects.
(3) EFT/B: Electri現區cal fast transient wave rising e唱作dge to 5ns, waveform into a numbe好城r of periodic p為用ulse string combination火水, very low energy. Propert短睡ies and electrostatic interference 船空is the same as th都問e common mode interf服紅erence path, including transmi秒要ssion also includes radiation.
Conducted susceptibili在懂ty of CS (4): th錢讀e common mode interference, int制煙erference frequency band from 150K計多Hz to 80MHz. In the project金哥 during the experiment, the 跳好interference signal sourc機北e to instrument cable length an也開d interference 生學frequency band (30MHz) corr也聽esponding to the w物歌avelength of the λ 1報制/4 is applied, the frequenc舊到y modulation interference volt訊聽age exceeds 30MHz, due to the s業從kin effect, the inter樹快ference signal in space r玩器adiation mode (less than 30MHz, or i又農n the main transmission interferenc劇船e).
The radiation s照家ensitivity of RS (5道低): the common mode interference女紙, interference freque見海ncy band from 8街動0MHz to 1GHz. Need to pay attention美機 to, drag cable做話 as a receiving antenna, electroma制亮gnetic interferen的動ce for the far field.議數
