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EMC/EMI Testing

EMC/EMI Testing:

ITC is a leading service provider for the Services which includes services like EMC/EMI testing & Environmental Testing for following types of products/standards:

We focus on the following industries product EMC/EMI testing:

  • Industrial electronics
  • Consumer electronics
  • Telecommunications
  • Medical

We can do the following EMC testing on your product.

       TestAs per standard
Electrostatic discharge immunity test(ESD test)IEC/EN 61000-4-2
Electrical fast transient/burst immunity testIEC/EN 61000-4-4
Surge immunity testIEC/EN 61000-4-5
Voltage dips, short interruptions and voltage variations immunity testsIEC/EN 61000-4-11
Limits for harmonic current emissions (equipment input current =16 A per phase)IEC/EN 61000-3-2
 Limitation of voltage changes, voltage fluctuations, and flickerIEC/EN 61000-3-3
For List of standards under EMC/EMI, please click here.

On a flight, during takeoff captain observe interference on Navigation System. They found a passenger was using a Laptop. Even, You are requested to switch off your mobile phones or change to Airplane mode while traveling by plane. Why?

This is because Cell phones, as well as other personal electronic devices such as laptops, tabs etc,  emit signals from High-Frequency clock oscillators. The resulting Electromagnetic Interference (EMI) can affect aircraft navigation, communication and control systems.
After Electrical, electronics, and Photometry ITC India Pvt Ltd has spread its wings in EMC testing.

So, What is EMC ( Electro Magnetic Compatibility)?

EMC: EMC is defined as the ability of electronic and communication equipment to be able to operate satisfactorily in the presence of interference and not be a source of interference to nearby equipment.

EMC = EME + EMI

EME: Electromagnetic Emission ( Interference), EMI: Electromagnetic Immunity.

Effects EME/ EM interference

1. Equipment to equipment

  • Loss of data in digital systems or in the transmission of data.
  • Interference to TV and radio reception.
  • Malfunction of Medical electronic equipment.
  • Malfunction of automotive microprocessor control system( braking) and navigation equipment.
  • Malfunction of critical process control functions. ( ex. Oil, chemicals, aircraft, railways.)

2. Equipment to human

  • IEEE C95.1 Standard for safety levels with respect to human exposure to radio frequency electromagnetic fields. 3KHz to 300 GHz
  • ICNIRP Guidelines limiting exposure to time-varying electric, magnetic and EM Fields. ( up to 300GHz)

List of EME and EMI Tests 

  1. Radiated Emission
  2. Conducted Emissions
  3. Electromagnetic Coupling
  4. Radiated Immunity
  5. Conductive Immunity
  6. Electro Static Discharge
  7. Fast transient and burst
  8. Surge
  9. Voltage dips and drops
  10. H- Fields

EMC Testing is required to confirm that a particular product follows the required standards. It divides into:

  • emissions testing
  • susceptibility testing.

Open-air test sites, or OATS, are the reference sites in most standards. They are especially useful for emissions testing of large equipment systems.
However, RF testing is most performed indoors, in an exclusive EMC test chamber. Types of the chamber include anechoic, reverberation and the gigahertz transverse electromagnetic cell.

Emission Testing: Emissions are generally measured for radiated field strength and were appropriate for conducted emissions along with cables and wiring. Inductive (magnetic) and capacitive (electric) field strengths are near-field effects and are only important if the device under test is designed for a location close to other electrical equipment.
For conducted emissions, typical transducers include the LISN (line impedance stabilization network) or AMN (artificial mains network) and the RF current clamp.
For radiated emission measurement, antennas are used as transducers. Typical antennas specified include dipole, biconical, log-periodic, double-ridged guide and conical log-spiral designs. Radiated emissions must be measured in all directions around the DUT.
Typically a spectrum analyzer is used to evaluate the emission levels of the DUT across a wide band of frequencies (frequency domain). Particular spectrum analyzers for EMC testing are available called EMI test receivers or analyzers. EMI receivers along with specified transducers can often be used for both conducted and radiated emissions. Pre-selector filters may also be used to reduce the effect of strong out-of-band signals on the front-end of the receiver.
Some pulse emissions are more usefully characterized using an oscilloscope to capture the pulse waveform in the time domain.
Susceptibility testing
Radiated field susceptibility testing generally involves a high-powered source of RF or EM energy and a radiating antenna to direct the energy at the device under test.
Conducted voltage and current susceptibility testing generally require a high-powered signal generator, and a current clamp or another type of transformer to inject the test signal.
Transient signals are used to test the immunity of the DUT against power line disturbances including surges, lightning strikes, and switching noise. In motor vehicles, similar tests are performed on battery and signal lines.
Electrostatic discharge testing is typically performed with a piezo spark generator called an “ESD pistol”. Higher energy pulses, such as lightning or nuclear EMP simulations, can require a large current clamp or a large antenna which completely surrounds the DUT. Some antennas are so large that they are located outdoors, and care must be taken not to cause an EMP hazard to the surrounding environment.

Avoid EMC Failure

When Product reaches the final stage of EMC testing and fails, this is a too frightening situation. To avoid such situation, compliance testing should be introduced in the projects from day one. Examining emissions from the product during each major development stages is the ultimate method to elude costly retesting and high failure rates.

If Flaws are detected in the early stage then these can be resolved sooner during the development stage and we can eliminate it easily.  From design to finished product we must treat it like baking of cake, we check the batter at every stage so that we can have the best taste of the cake. So, from designing part to electronics analysis of the product, our examining of the product will help to detect the defects that can be resolved in an early stage. We can add EMI shields or EMS foam can be added to avoid any leakage or gaps in enclosures. Setting pre-compliance as a milestone a project can be healthy and nutritious.

EMC pre-compliance testing helps you to control general failure that occur while testing.

  • Minimize RF noise
  • Assuming power, ground, and static input /output signals are clean
  • Recognizing and monitoring ESD testing locations
  • Calculating ESD levels
  • Choosing and testing the appropriate power adapter
  • Optimizing functional equipment, such as LCDs
  • Inspecting auxiliary equipment for compliance, a step that is often overlooked
  • Selecting and cohering to the appropriate protection rating
  • Safeguard sensitive analog and RF circuitry

In this electronics world, we all are too much dependent on such gadgets and devices. EMC testing is becoming mandatory to maintain quality. Europe, US, China, Korea, Australia, Newzealand made EMC testing mandatory to improve product performance, to meet the regulatory requirement. ITC India Pvt Ltd is offering EMC testing and certification. With a team of Experts, your project will go smoothly. So, for any kind of EMC testing please feel free to contact us at info@itcindia.org URL www.itcindia.org

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