Radio Frequency Testing

In today's information age, the display screen, as an important interface for human-computer interaction, is widely used in many fields such as television, computers, advertising machines, industrial control, etc. With the increasing integration of electronic products and the increasingly complex electromagnetic environment, the electromagnetic compatibility issue of display screens has become more prominent. Conducting EMC testing is not only a mandatory requirement for market access, but also a necessary means to ensure product reliability.

 

1、 Understand the basic concepts of EMC testing

Electromagnetic compatibility mainly includes two aspects: first, the electromagnetic interference generated by the equipment cannot exceed the limit value, that is, electromagnetic interference (EMI) testing; The second is that the equipment should have sufficient anti-interference capability, namely electromagnetic sensitivity (EMS) testing. Through these two evaluations, the adaptability of the display screen in complex electromagnetic environments can be verified.

 

2、 The main items of EMC testing for display screens

Electromagnetic interference testing focuses on examining the impact of equipment on the external environment. Conducted disturbance testing mainly detects electromagnetic noise transmitted along power or signal lines. Radiation disturbance testing evaluates electromagnetic interference caused by space radiation.

Harmonic current testing is mainly used to evaluate the impact of equipment on the quality of the power grid. Voltage fluctuation and flicker testing focuses on the impact of equipment on the stability of grid voltage.

Electromagnetic immunity testing mainly tests the performance of equipment in withstanding external interference. Static discharge immunity test simulates the impact of human static electricity on equipment. Radiation immunity testing verifies the stability of equipment in electromagnetic radiation environments.

Electrical fast transient burst immunity test simulates the instantaneous interference generated by switch actions in a circuit. Surge immunity testing evaluates the anti-interference ability of equipment when struck by lightning or when high-power equipment is started or stopped.

 

3、 Execution process of EMC testing

The first step is to confirm the testing standards. It is necessary to select the corresponding testing specifications based on the target market, such as the EN 55032 standard in the European Union region.

The second step is to prepare samples and related documents. Complete technical documentation is required, including product specifications, circuit drawings, and other materials.

 

4、 Key points of test preparation work

Before formal testing, it is recommended to complete the following preparation work: organize complete product technical information, prepare test samples that meet the requirements, and clarify the specific testing requirements

 

5、 Detailed explanation of the testing implementation process

After the samples are delivered to the laboratory, they will be tested according to standard procedures. The testing environment usually includes professional venues such as anechoic chambers and shielding rooms.

 

6、 Analysis of common testing problems

During the actual testing process, common problems include: radiation emission exceeding the limit range, electrostatic discharge causing abnormal high-frequency interference on the screen, and display shaking

 

7、 Rectification measures for testing non-compliance

For common problems, the following improvement measures can be taken: optimizing the design of the power filter circuit, strengthening the shielding treatment of the signal line, and improving the layout of the grounding system

 

8、 Professional advice and precautions

It is recommended that companies introduce EMC design concepts in the early stages of product design. Plan the testing time in advance to leave room for possible improvements.

 

9、 The application value of test results

The report obtained through EMC testing can serve as an important basis for applying for certifications such as CE and FCC.

 

10、 Summary

The EMC testing of display screens is a systematic project that requires strict control over every aspect from design to production. Choosing a professional testing agency can help companies complete the certification process more smoothly.

If you encounter technical difficulties during the testing process, please feel free to consult at any time. You can contact Mr. Deng at 13925591357. We will provide you with professional technical support.

By systematically planning and executing the testing process, combined with the guidance of a professional technical team, enterprises can effectively complete the EMC testing of display screens. The correct testing methods and a professional execution team are key factors in ensuring successful testing.