Research On Multimedia Electromagnetic Compatibility Standard

Lately,when we should do the EMC Test on an electronic product,we might use two separate standard,one is about the AV product,another is about the IT product. Although we can use both of them to accomplish our test,it's not convenient. So,the Standard committee CISPR decided to make a new standard to substitute the old ones.But,the work hasn't finished.In this paper,after I studied the new draft standard and some old standards about this,we summarized them to give some idea about the limits,the test methods and the judging standard in the new multimedia electromagnetic test.The major contributions are outlined as follows:1.A lot of problems about the multimedia equipment radio disturbance test were summarized,for example, the classification and limits of the multimedia equipment,the procedure of the test and the test scene the product-under-test.2.Many problems about the multimedia equipment immunity characteristic test were summarized,for example,we analyzed the whole testing procedure,and we summarized the test scene of the product that is under test,and we analyzed the judging standard.3.We analyzed the limits in the test standards,first we analyzed the limit in the radio disturbance test in SAC,and we found that the results shouldn't be transferred by the theory formula,we should consider the NSA,this can give us a more precise result,and then through analying,we found that we should get at least 5-7sample points to give a relatively good bootstrap confidence interval estimation.4.At last we described the construction of the GTEM cell,hoping can give some information about the test scene about the EUT.