Incorporating the above into your design will help with EMC testing. Shielding can be an asset and may be necessary for high power radiators such as transformers. Strategically placed test points can also be helpful for bench testing of the board. One of the most effective means of controlling EMI and aiding EMC is to utilize good grounding, which means minimizing ground loops, and ground bounce.įor high power boards and PCBAs with switching power supplies, good filtering is critical for voltage regulation and to manage noise and achieve EMC. Your board layout is always important however, there are special considerations that must be accommodated for high-speed and SPI applications. The following steps can be instituted by most design programs and can help facilitate the testing process: Design Aids for EMC Testingįollow good layout rules for high-speed boards The answer is yes however, the level of assistance is dependent upon the design tool you use. The last remaining question is whether you can aid the testing process during design. Therefore, we know what EMC testing is and why it should be done. In fact, for the more restrictive industries (aerospace, automotive, medical devices) noncompliance is synonymous with non-usable. Obviously, EMC compliance can be a major development issue depending upon the type of board you are building. How You Can Aid EMC Testing During Design Organizations such as SAE, European Commission and others also have EMC testing standards. ISO 11452: Road Vehicles - Component Test Methods For Electrical Disturbances From Narrowband Radiated Electromagnetic Energy - Part 1 - Part 9. IEC 61000: Electromagnetic Compatibility (EMC). Applicability may be determined by manufacturer location, end-user geolocation or industry for which the board is made.įor information on EMC testing standards, see the following: From a regulatory perspective, only applicable testing must be done to avoid sanction(s) for noncompliance. Just in case the two reasons listed above do not provide the necessary motivation to perform EMC testing, then the fact that most EMC testing is mandatory and defined by one of many standards. In addition to safety, boards should be tested to find out whether they will function as designed and meet their operational objectives within their deployment environment. The prevailing motivation for EMC testing is to ensure the safety of users and operators of the electronic equipment and systems of which your boards are a part. There are a number of good reasons why your boards should undergo testing for EMC including the following: What is EMC Testing and Why Do It?ĮMC testing is the performance of testing regimens that evaluate the levels of EM radiation from and to your board to determine the effect on the performance of your board and the potential impact on electronics in the surrounding environment. EMC is then the ability of electrical and electronic systems in close proximity to operate with minimal interference on each other’s operation. Radiated EMI occurs through the air and conductive EMI is transferred directly through a conductor or another material. This means that EMI is any unwanted signal (or collection of signals) that disturbs or disrupts the transmission and/or reception of information or data.īasically, there are two sources of EMI or noise. A functionally reasonable way to interpret EMI or RFI, if limited to between 9 kHz and 275 GHz, from a communications system perspective is as noise. EMI and EMC: What is the Difference?ĮMC, which stands for electromagnetic compatibility, is probably best defined in terms of EMI. Let’s clearly define what EMC testing is, why it should be done and how you can help the process during design. And testing is a primary means of meeting this goal. Often overlooked during design however, are the electrical effects of nearby circuitry on the board under design and vice versa, especially if these PCBAs are not interconnected.Īchieving a reasonable degree of balance between all of the boards and electrical devices in an area is known as EMC. There are the obvious issues of ample space and the need for adequate power to operate, of course. The need to fit in with the neighbors is also a dilemma for PCBAs that will be installed in larger electronic systems. Fitting in with your neighbors can be some of the first forms of contact that you might be curious about - how many of your conversations have they heard, or do they think your music is too loud? How well you get along, even in times where social contact is so limited, or perhaps especially, is of great importance. One can never help paying attention to what others think of you. How you can aid EMC testing during design. What is the difference between EMI and EMC?
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