With the development of society, shielding materials have become increasingly popular. Therefore, the country has also issued relevant regulations and methods for the testing of shielding materials to ensure the fairness and impartiality of testing reports. What are the methods for testing shielding effectiveness? Let's take a look together
Types of shielding effectiveness testing methods
Shielding effectiveness testing mainly includes issues such as signal amplification, transmission, and measurement. According to GB/T 30142-2013, the current testing methods are divided into: shielding room window testing method, small shielding body window testing method 30 MHz~1.5 GHz flange coaxial device testing method and 30 MHz~3 GHz flange coaxial device testing method
Shielded room window testing method
Shielded room can be understood as a sealed box that will not receive external electromagnetic field interference, while also ensuring that the electromagnetic field in the space is not affected. The testing is mainly based on the original electromagnetic transmission line, with a window opened on one side to install the sample, and then test the transmission and reception of new signals. This method is quite common
Small Shielding Body Window Test Method
This is equivalent to a small shielding chamber and is the same as the shielding chamber window test method. The test window is usually 0.3 m, suitable for plane wave far-field shielding effectiveness testing of small-sized shielding materials, with a frequency range of 1 GHz to 18 GHz.
Flange coaxial device testing method
The flange coaxial device testing method is applicable in the frequency range of 30 MHz to 3 GHz, and can measure the plane wave shielding effectiveness of thin materials with a thickness of less than 10 mm and less than 15 mm. The dynamic signal reception range can reach 120 dB, which has good repeatability and is suitable for measurement during online quality control of products.
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China