Solutions:

EMC Testing

EMC Testing

Electromagnetic compatibility, or EMC, is a property of devices which produce and come into contact with electromagnetic fields. EMC testing indicates to engineers whether a device is compatible with its electromagnetic environment and determines whether the device will produce EMI, or electromagnetic interference. In a world without EMC testing, the risk of helicopters falling out of the sky, respirators going silent or your cell phone losing its signal would increase. All of these machines produce electromagnetic fields, and thus before entering the market need to fulfill requirements like IEC, CISPR and MIL-STDs (military standards) and achieve EMI compliance.

 

EMC testing in an anechoic chamber
 

Steps of EMC Testing

 
  1. Find the Standards. "What standards apply to my product?" is the first question you should ask yourself. Varying between product type and geography, standards can be difficult to define or pin down and missing an EMC standard can be disastrous for manufacturers. Contact an EMC test lab and determine what standards you need to meet before sending your product in or develop an EMC test plan yourself if you’re familiar with the requirements. To do your own research, visit ATEC’s standards page, which will give you detailed outlines of each standard, and call +1 (800) 404-2832 for any questions.


  2. Conduct Pre-Compliance Testing. You want your products to possess flawless EMI immunity and produce no more accidental energy than regulations require before they are formally tested. Test your devices in full-compliance test sites like anechoic chambers or RF shield enclosures. Rent full-compliance testers like EMI receivers. Depending on the product being tested, be sure to test for both the product’s immunity to EMI and the EMI emissions it generates, which are discussed in the sections below. Renting fully EMC-compliant test equipment from ATEC will save you money and time in the pre-compliance process—we are ISO-9001 certified and ISO 17025 accredited in calibration by the A2LA.

  3. Choose an EMC test lab. Be sure to choose an EMC lab that is A2LA 17025 accredited. EMC accreditation is essential to establishing the validity of your testing when placing products on the market. Because of this, though, EMC labs are busy. Book your appointment months in advance, and plan out your pre-compliance testing so you can avoid expensive rescheduling.

EMC Test Equipment

To assess the EMC of a device or system, technicians perform four basic types of tests: radiated immunity, radiated emissions, conducted immunity and conducted emissions.  
 

Radiated Immunity Testing

Radiated emissions testing measures the electromagnetic energy a product generates, simulating the interference a device may produce in its environment. Currents and switching voltages within all digital circuits unintentionally generate EMI. The challenge for engineers, then, is to mitigate this interference to the required levels. Radiated emissions testing is conducted either in open area test sites or in anechoic chambers.

 
Advanced Amplifiers AA618G-300
RF Power Amplifiers
RF power amplifiers are used to increase the power of a small signal to a high power signal (by a specified gain). RF amplifiers are used widely in the fields of communications, radar, aerospace, defense, medical and many others, and technicians rely on RF amplifiers for a variety of EMC applications and for fulfilling test standards like MIL-STD-461G RS103.

View Products
 

Conducted Immunity Testing

A conducted immunity test monitors a device’s resistance to external interference generated by a conductor of EMI, like a power or signal cable. Engineers perform conducted immunity testing to discover how the instrument in question reacts to conducted EMI, and how it can be augmented to enhance its immunity.

 
Haefely AXOS8
Transient Immunity Generators
Transient immunity generators simulate transients for the conducted immunity portion of EMC testing. A transient is a dramatic fluctuation in current or voltage a device may experience while connected to a power grid; voltage spikes and oscillations are common examples. Conducted immunity testing determines the susceptibility of the equipment under test to such disturbances.

View Products
 

Conducted Emissions Testing

Conducted Emissions testing detects the presence of internal emissions of electromagnetic energy, which grow in strength as they are conducted along a power or signal conductor, generating interference. The conductor thus acts as an antenna that is “accidentally transmitting.” Generally, this testing method is applied to simulate internal interference found in power leads and antenna terminals.

 
Keysight E7405A
EMI RECEIVERS
EMC analysis requires high performance instrumentation in order to acquire data one is not expecting to see. EMI receivers are used for scenarios where transient signals or spurious emissions may appear and must be acquired with fast acquisition rates. Multiple organizations have set standards for testing these emissions, including CISPR, IEC/EN, FCC and MIL-STD, who recommend using a EMI test receiver for fully compliant testing.

View Products
 

Radiated Emissions Testing

Radiated emissions testing measures the electromagnetic energy a product generates, simulating the interference a device may produce in its environment. Currents and switching voltages within all digital circuits unintentionally generate EMI. The challenge for engineers, then, is to mitigate this interference to the required levels. Radiated emissions testing is conducted either in open area test sites or in anechoic chambers.

 
AH Systems PAM-0118 Preamplifier
PREAMPLIFIERS
Used in many applications, including Radiated Emissions testing and troubleshooting/debugging scenarios. The purpose of a preamplifier is to amplify a small signal to be measured and analyzed, whereas it would remain unseen without being amplified. If the Spectrum Analyzer is being used in a scenario of small signal analysis, a preamp is likely needed unless built in to the front end of the analyzer.

View Products
     

EMC Industries

For manufacturers in many fields, testing the electromagnetic qualities of a product is an essential step in production.
 
Medical
EMC testing is a critical step in the manufacturing of medical devices. If a medical device is unable to function well with the electrical systems around it, the device may pose a risk to patients. The FDA mandates that all medical devices are EMC tested according to IEC standards. 
 
Consumer
Everything from your iPhone to your laptop and Xbox undergo EMC tests, especially devices which connect to Wi-Fi and have the potential to emit far-reaching EMI. FCC standards call for comprehensive testing before allowing products to enter the marketplace.
 
 
Automotive
Manufacturers of cars and other automotive machines require EMC testing for both their components, including parts like engines and radios, and the automobiles as a whole. BMW, Mercedes and Volkswagen are just a few of the car companies with such standards.
 
Component Testing
Component testing is an expansive facet of EMC. Semiconductors in particular are utilized in nearly all computerized products, and due to their capacity for electromagnetic emission, require testing to ensure they don’t interfere with other devices.
 
Defense
Military equipment is subject to rigorous testing standards which call for electromagnetic susceptibility and emissions testing, among other requirements. MIL-STD-461 is a common standard for automobiles, aircraft, spacecraft and other vehicles and instruments which may be at risk of emitting or being affected by electromagnetic energy.
 
Aerospace
The aerospace industry relies on EMC testing to confirm aircraft will not be susceptible to EMI radiating from the digital meccas they may pass over, adhering to standards like DO-160 to ensure full compliance before the craft enters the market. This standard includes guidelines for commercial planes and helicopters as well.