GB/T 40675.2-2021 English PDFUS$484.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 40675.2-2021: Noise suppression sheet for digital devices and equipment - Part 2: Measuring methods Status: Valid
Basic dataStandard ID: GB/T 40675.2-2021 (GB/T40675.2-2021)Description (Translated English): Noise suppression sheet for digital devices and equipment - Part 2: Measuring methods Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: L19 Word Count Estimation: 28,299 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 40675.2-2021: Noise suppression sheet for digital devices and equipment - Part 2: Measuring methods---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Noise suppression sheet for digital devices and equipment.Part 2.Measuring methods ICS 29.100.10 CCSL19 National Standards of People's Republic of China Noise suppression sheet for digital devices and equipment Part 2.Measurement method (IEC 62333-2.2015, IDT) Released on 2021-11-26 2022-06-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee Table of contentsPreface Ⅴ Introduction Ⅵ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 General 1 5 Test method 2 5.1 Same side decoupling ratio. Rda 2 5.1.1 Principle 2 5.1.2 Test device 3 5.1.3 Test sample 5 5.1.4 Step 6 5.1.5 Presentation of test results 7 5.2 Different side decoupling ratio. Rde 7 5.2.1 Principle 7 5.2.2 Test device 8 5.2.3 Test sample 9 5.2.4 Step 9 5.2.5 Presentation of test results 9 5.3 Transmission attenuation ratio. Rtp 9 5.3.1 Principle 9 5.3.2 Test device 10 5.3.3 Test fixture 10 5.3.4 Test sample 11 5.3.5 Step 11 5.3.6 Presentation of test results 12 5.4 Radiation suppression ratio. Rrs 12 5.4.1 Principle 12 5.4.2 Test device 12 5.4.3 Test sample 15 5.4.4 Step 16 5.4.5 Presentation of test results 17 5.5 Line decoupling ratio. Rdl 17 5.5.1 General 17 5.5.2 Principle 17 5.5.3 Test device 18 5.5.4 Test sample 20 5.5.5 Step 20 5.5.6 Presentation of test results 21 Figure 1 Schematic diagram of antenna pair and NSS test 2 Figure 2 Antenna pair and NSS 3 under test Figure 3 Frequency response of coupling between loop antenna pairs 3 Figure 4 Example of recommended small loop antenna for testing 4 Figure 5 Sectional view of test layout 5 Figure 6 Schematic diagram of test layout 6 Figure 7.Test principle of loop antenna pair and test sample. Figure 7 Figure 8 Schematic diagram of antenna pair and test sample test 8 Figure 9 Schematic diagram of the test device 8 Figure 10 Schematic diagram of the test method of transmission attenuation rate Rtp 10 Figure 11 Test result data example 12 Figure 12 Rrs test system Figure 13 Figure 13 Schematic diagram of test fixture 13 Figure 14 The size and structure of the test fixture 14 Figure 15 Adhesion of the test sample to the fixture 15 Figure 16 Test fixture 16 set on the turntable Figure 17 Noise path 17 Figure 18 Test fixture for line decoupling measurement 18 Figure 19 Schematic diagram of line decoupling ratio measurement device 18 Figure 20 NSS, loop antenna and magnetic flux configuration 19 Table 1 Advantages and limitations of the recommended antenna 4 Table 2 Dimensions of loop antenna 5 Table 3 Dimensions of the test sample 6 Table 4 Dimensions of loop antenna 9 Table 5 Dimensions of the test fixture 10 Table 6 Dimensions of test samples 11 Table 7 Dimensions of the test fixture 14 Table 8 Dimensions of test samples 15 Table 9 Classification of noise suppression effects of different noise paths and NSS locations 17 Table 10 Dimensions of MSL 19 Table 11 Dimensions of loop antenna 19 Table 12 Dimensions of test samples 20ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is Part 2 of GB/T 40675 "Noise Suppression Sheets for Digital Devices and Equipment". GB/T 40675 has been released Lower part. ---Part 1.Definition and general performance; ---Part 2.Measurement methods; ---Part 3.Parameter characteristics of noise suppression film. This document is equivalent to IEC 62333-2.2015 "Noise suppression sheets for digital devices and equipment Part 2.Measurement methods". A chapter "Terms and Definitions" has been added to this document. This document has made the following minimal editorial changes. ---Added formula number; ---Introduction is added before the items. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This document is under the jurisdiction of the National Standardization Technical Committee for Magnetic Components and Ferrite Materials (SAC/TC89). Drafting organization of this document. Tiantong Holding Co., Ltd. The main drafters of this document. Song Yanyan, Shao Feng, Miao Simin, Tang Jie.IntroductionThe noise suppression sheet has the advantages of wide application frequency range, large operating temperature range, good electromagnetic noise suppression effect, and large thermal conductivity. It is beneficial for applications in mobile phones, digital cameras, digital video cameras, notebook computers, scanners, CD/VCD, PDAs, car navigation systems, etc. It is used to reduce the crosstalk between lines, reduce the electromagnetic induction coupling of connected circuits, reduce radiation, attenuate the induced current and attenuation on the LCD shielding layer. Reduce the interference of the internal radio frequency circuit, reduce the mobile phone SAR radiant rate, etc. With the high frequency, miniaturization, integration and functionalization of electronic equipment The development trend of noise suppression film is more and more widely used in digital devices and equipment. GB/T 40675 "Noise suppression sheet for digital devices and equipment" consists of 3 parts. ---Part 1.Definition and general performance. Defines the electromagnetic field for digital devices and equipment with a frequency of 30MHz~30GHz. The terms and definitions of the noise suppression film, and the effect of using the noise suppression film on the signal are given. ---Part 2.Measurement methods. The measurement method of the electromagnetic characteristics of the noise suppression sheet is specified. These measurement methods can suppress noise The performance of the film is effectively and repeatedly measured to ensure that manufacturers and users can get the same measurement results. ---Part 3.Parameter characteristics of noise suppression film. Digital devices and equipment with a frequency of 30MHz~30GHz are given Use electromagnetic noise suppression sheet (NSS) parameter characteristics. GB/T 40675.2 specifies the test details of the parameters defined in GB/T 40675.1.The two parts are closely related and need to be coordinated use. GB/T 40675.2 can effectively and reproducibly test the performance of noise suppression films, and provide production and trading parties in the industry with A unified measurement basis to ensure that manufacturers and their users can obtain the same measurement results, thereby helping to standardize production and trading in the industry To promote the healthy and orderly development of the industry. Noise suppression sheet for digital devices and equipment Part 2.Measurement method1 ScopeThis document specifies the measurement method of the electromagnetic characteristics of the noise suppression sheet. These measurement methods can effectively measure the performance of the noise suppression sheet. And it can be measured repeatedly to ensure that manufacturers and users can get the same measurement results.2 Normative referencesThe content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. IEC 62333-1 Noise suppression sheet for digital devices and equipment Part 1.Definition and general performance (Noisesuppression sheetfordigitaldevicesandequipment-Part 1.Definitionsandgeneralproperties) Note. GB/T 40675.1-2021 Noise suppression sheet for digital devices and equipment Part 1.Definition and general performance (IEC 62333-1.2006, IDT) CISPR16-1 Radio disturbance and immunity measurement equipment and measurement method specification Part 1.Radio disturbance and immunity measurement Measuring equipment (Specificationforradiodisturbanceandimmunitymeasuringapparatusandmethods-Part 1. Radiodisturbanceandimmunitymeasuringapparatus) Note. GB/T 6113.101-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-1.Radio disturbance and immunity measurement Measuring equipment (CISPR16-1-1.2010, IDT); GB/T 6113.102-2018 Specification for Radio Disturbance and Immunity Measurement Equipment and Measurement Methods Part 1-2.Radio Disturbance and Immunity Measurement Coupling device for measurement of conducted disturbance from measuring equipment (CISPR16-1-2.2014, IDT); GB/T 6113.103-2021 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-3.Radio disturbance and immunity measurement Disturbance power of auxiliary equipment for measuring equipment (CISPR16-1-3.2016, IDT); GB/T 6113.104-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-4.Radio disturbance and immunity measurement Measuring antenna and test site for measuring equipment radiation disturbance (CISPR16-1-4.2012, IDT); GB/T 6113.105-2018 Specification for Radio Disturbance and Immunity Measurement Equipment and Measurement Methods Part 1-5.Radio Disturbance and Immunity Measurement Measurement equipment 5MHz~18GHz antenna calibration site and reference test site (CISPR16-1-5.2014, IDT); GB/T 6113.106-2018 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-6.Radio disturbance and immunity measurement Calibration of EMC antennas for measurement equipment (CISPR16-1-6.2014, IDT). CISPR22 Information technology equipment radio interference limits and measurement methods (Informationtechnology equipment-Radio disturbancecharacteristics-Limitsandmethodsofmeasurement) Note. GB/T 9254-2008 Information Technology Equipment Radio Disturbance Limits and Measurement Methods (CISPR22.2006, IDT)3 Terms and definitionsThere are no terms and definitions that need to be defined in this document.4 GeneralThe electromagnetic interference between electronic devices comes from the radiation of electronic devices, and part of it is the radiation generated by active devices driven by high frequency. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 40675.2-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 40675.2-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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