How to Use an EMI Analyzer and EMC Test Receiver for Improved Testing

EMC test receiver is an instrument used to test whether electronic products comply with EMC standards. When electronic equipment is in use, it will generate electromagnetic radiation and electromagnetic induction. These electromagnetic waves may cause interference or damage to other equipment or the environment. Therefore, EMC testing is required for electronic equipment to ensure that they will not produce such interference during actual use. and damage.

What is EMC?
EMC testing helps to minimize the interference of radiated or conducted emissions from equipment to other surrounding electronic products. EMC testing also ensures that your own electronic equipment will function as expected when in close proximity to other sources of electromagnetic radiation.

Understanding Conducted vs Radiated Emissions:
Electromagnetic emissions are radio frequency (RF) energy emitted by a product. This includes two broad categories: conducted emissions and radiated emissions.

Wires and conductors in many electronic devices do not work as well as antennas at frequencies up to 30MHz. Therefore, at such frequencies, there is no need to worry about radiated emissions. However, these wires and conductors can conduct RF energy through a shared power source or load, and the resulting conducted emissions may affect other electronic equipment.

Above 30MHz, conducted emissions are usually no longer a problem, but in this case, conductors and wires, like antennas, may radiate RF energy and therefore may interfere with other equipment.

The test procedures and equipment used are slightly different when measuring conducted and radiated emissions. The filter elements used to moderate their effects are similar, but the electrical values often vary.

Conduction test in EMI:
1 Propagated by power lines, etc., causing interference to other machines
2 Tested using a high-frequency voltage regulation loop network between one end of the power cord and the earth
3 System core equipment, spectrum analyzer/receiver, artificial power network, antenna, darkroom (including turntable, etc.), software and other accessories
4 Site requirements, test in a shielded room or dark room environment.

Radiation test in EMI:
1. The object under test (EUT: Equipment Under Test) spreads radiation into space and interferes with other machines
2. Use the receiving antenna to measure the strength of electromagnetic wave propagation
3 System core equipment: mixed-domain oscilloscope/spectrum analyzer/receiver, anechoic chamber (including turntable, etc.), antenna/near-field probe, software and other accessories.
4 Site requirements, test in an anechoic chamber environment.

Today, EMC testing is the only evaluation core test to measure whether electronic equipment can meet the requirements. However, the performance of traditional EMC test receivers will be affected by absorption, refraction, scattering and other external interference factors, and inaccurate results will be displayed on the test report.

All of these will increase the test cycle and lead to inaccurate test receiver accuracy and test results, thus making it difficult for the product to pass the test. Therefore, modern technologies such as EMI analyzers and EMC test receivers can be employed to improve the EMC testing process.

The main function of the EMI analyzer is to measure the electromagnetic radiation environment, which can help engineers identify the location and nature of external interference signals existing in the field. When conducting outdoor EMC testing, the EMI analyzer can help locate and analyze the source of electromagnetic radiation from the power grid, and design measures based on the measured signal strength.

In addition, during indoor testing, EMI analyzers can be used to monitor the effectiveness of noise suppression measures to determine the emission parameters of nearby parts of the noise, thereby ensuring that the test laboratory’s components maintain test reliability.

On the other hand, EMC test receivers in the laboratory can improve the accuracy of EMC testing. The test receiver is capable of establishing complex reference signals, as well as the accuracy of the agreed signal, so it can handle complex electromagnetic field measurement tasks.

Generally speaking, EMC test receivers can measure a variety of emissions from equipment under test in the laboratory, allowing the collection of noise parameters, as well as the detection of electromagnetic waveforms related to suppressing equipment. In addition, if complex tests are to be performed, EMI analyzers and EMC test receivers can be used together to improve the validity, accuracy and repeatability of test data.

Using the EMI analyzer can accurately measure the external electromagnetic radiation environment and understand the unprocessed external interference signal in order to calibrate the reference receiver and ensure the accuracy of the test results.

At the same time, the EMC test receiver helps to accurately track the required signal at the level of electromagnetic radiation emitted by the device under test in order to accurately measure the noise parameters. All in all, EMC testing can be improved using EMI analyzers and EMC test receivers.

Through the EMI analyzer, the external electromagnetic radiation environment and the information of external interference signals existing in the field can be accurately measured. At the same time, the use of EMC test receivers can improve the accuracy of the test and help to accurately track the required signal in order to accurately measure the noise parameters.

Therefore, the use of EMI analyzers and EMC test receivers can reduce test cycles, improve test accuracy, and help improve the reliability of test results, thereby improving test efficiency.

How to test with EMI analyzer and EMC test receiver?
1. Connect the analyzer and the test receiver to the amplifier/device to be tested. Ensure proper connection of cables and turn on the test receiver and the EMI analyzer.
2. Select the input signal frequency range, channel spacing, signal strength, etc. on the analyzer.

3. Place the test receiver around the device to be tested and turn it on.
4. Start the analyzer by choosing the desired frequency span and then adjust the receiver’s controls for the desired receiver bandwidth.
5. Select the appropriate test receivers sensitivity and start the sweep.

6. Observe the display of the EMI or field strength and make note of any peaks.
7. Adjust the receiver’s sensitivity until the desired signal strength is achieved.
8. Repeat steps 4-7 for any other frequencies necessary.
9. Compare the obtained data to the regulatory requirements specified in the EMC standards.
10. Make adjustments or determine mitigation measures based on your observations.

EMI receiver system for EMI (Electromagnetic Interference) radiation conduction or conducted emissions testing. The EMI-9KB EMI receiver is produced by the full closure structure and strong electro-conductibility material, which has high shielding effect. Due to the new technology for the EMI Test System, it solved the instrument self-EMI problem. The test results are according to the international format test report. The EMI Test System EMI-9KB fully meets CISPR15:2018, CISPR16-1, GB17743, FCC, EN55015 and EN55022.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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