Electromagnetic compatibility testing is the criterion for evaluating product quality

Describe

Electromagnetic compatibility (EMC) refers to the ability of electrical equipment or system to operate without interference or resistance to electromagnetic environment interference. EMC test is one of the important standards to evaluate the quality of products. In order to ensure the EMC quality of products in the most economical way, appropriate measures should be taken at the early stage of product design.

By definition, EMC is divided into electromagnetic interference (EMI), electromagnetic immunity or sensitivity (EMS). The regulation stipulates that the maximum value of EMI and the minimum value of EMS shall be met. The available limits, measurement methods and instruments are specified in relevant standards.

Conformity identification

　　In order to prove compliance with relevant EMC standards, all electrical equipment must be provided with relevant identification. For example, the CE conformity mark in the whole European Economic Area.

EMI measurement

In the field of electromagnetic interference measurement, in the commercial field, radio receivers or television viewers and other interference receivers are always replaced by measuring instruments. Therefore, all commercial EMI measurement receivers should have a built-in response similar to that of people: they must be equipped with quasi-peak detectors to display people's perception of interference, and take this perception as the measurement value. For interference measurement above 1GHz, peak, CISPR-AV and RMS-AV weighting shall be used.

In the military field, the jamming receiving device is required to respond to the maximum jamming signal. Therefore, it is necessary to measure the peak value of the interference signal.

Because the equipment under test emits interference signals through various coupling modes, the EMC standard has made relevant provisions on the coupling mode of the test receiver and the equipment under test, the environment of the EUT and its operation.

EMS test

In the measurement of electromagnetic sensitivity, the corresponding signal generator is used to replace the actual various interference signal sources, and the signal generated by the signal generator is applied to the equipment under test through the appropriate coupling/decoupling network.

In order to monitor whether the EUT function is normal, appropriate monitoring equipment is required, which is not specified in relevant EMC standards at present. So in mosttead. cases, we have to use highly shielded cameras and monitors instead.

EMC measurement software

The repeatability of EMC measurement can only be achieved if the measuring instruments and methods used strictly comply with relevant rules and standards. For EMC measurement under computer control, two different software tools can be used. R&SES-SCANEMI test software is used to quickly and easily collect, evaluate and record interference voltage, power and field strength data. The R&SEMC32 software platform includes various modules for electromagnetic interference (EMI) and electromagnetic sensitivity (EMS) measurement. Because of its flexible structure, the software can meet the requirements of almost any commercial or military EMC application.

These tools can reduce the workload set by users and provide users with various conveniences, including automatically considering the conversion factor of coupling/decoupling network according to the frequency, automatically selecting the relevant limit value, graphical or list display of measurement results, test report generation, and so on. The automatic EMI test mode provided by R&SESU, R&SESR, R&SESRP and R&SESL test receivers can bring the same convenience. They allow full automatic measurement without using an external controller, which is very time-saving, and therefore can realize a very compact test device.

EMC test system

The planning and implementation of a practical and feasible EMC test system requires a wealth of professional knowledge and experience, which is what the professionals of Rhode and Schwartz have. Its professional skills ensure that the turnkey EMC test system can obtain the correct EMC measurement in the fastest way.

These test systems are always customized for the specific needs of customers to provide the best solution for customers. We are able to provide all the equipment and complete system architecture required from small systems to certified test laboratories with shielded anechoic chambers, covering all the major standards of commercial, automotive, wireless and military standards.