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|New EMC/EMI test facility at Navi Mumbai|
|Press Trust Of India / Mumbai November 10, 2004|
|The Society for Applied Microwave Electronics Engineering and Research (Sameer) has set up an electromagnetic compatability (EMC) testing centre in Navi Mumbai with an aim to boost export of electronic goods from India.|
|The upcoming EMC test facility, which meets global standards, will be conducting electromagnetic interference (EMI) and EMC measurements as per international and national standards to meet the conducted emission (CE) or 'C' marking norms, Sameer director K R Kini said.|
|The facility will be operational from 2005.|
|Sameer already has three testing centres -- in Chennai, the IIT campus at Powai in Mumbai and Kolkata -- "but this new facility in Navi Mumbai will have a three meter test range with anechoic shielded chamber (to absorb electromagnetic waves) facility for radiated emission (RE) measurements.|
|EMC is the ability of equipment and systems to function as designed in their intended operational environment without adversely disturbing or being effected by other equipment or systems.|
|EMI is the phenomenon which causes frequency spectrum pollution, adversely affecting the function of other equipments.|
|The concern for EMI/EMC-related problem has reached global levels and as a result no product can be sold in the international market without compliance testing to CE marking, Kini added.|
What is EMI/EMC?
EMI/EMC is the acronym of ElectroMagnetic Interference/Compatibility. Its concern is the ability of electronic equipment to work satisfactorily in the electromagnetic environment (immunity) without introducing intolerable electromagnetic interference to that environment (emission).
Computer screen distortion caused by your cellular phone, cross-talk between phone lines, and electrostatic discharge (ESD) are some examples of EMI problems.
EMC is concerned with the generation, transmission and reception of electromagnetic energy. These three aspects of the EMC problem form the basic framework of any EMC design. A source (also referred to as an emitter) produces the emission, and a transfer or coupling path transfers the emission energy to a receptor (receiver), where it is processed, resulting in either desired or undesired behavior. Interference occurs if the received energy causes the receptor to behave in an undesired manner.
Importance of EMC
EMC has become increasingly important recently because of its wide ranging industrial and more general societal (for instance medical) implications. Meeting EMC standards is a basic requirement for any electrical and electronical device before placement on the market. EMC problems are thus main concerns of the telecommunication, electronics, automobile industry.
There are four types of EMC test: radiated emission, radiated immunity, conducted emisssion and conducted immunity.
The radiated emission test system includes equipment under test (EUT), an antenna and the signal analysis device. The induced voltage from antenna is measured and the data is used to calculate the field strength by antenna factor.An immunity test, requires an electromagnetic source to generate the desired environment. This source is linked to the EUT either by radiated or by conducted method. Additionally, a monitor is required to know if the EUT is working well.