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YD/T 1644.1-2020 related PDF English

YD/T 1644.1-2020 (YD/T1644.1-2020, YDT 1644.1-2020, YDT1644.1-2020) & related versions
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YD/T 1644.1-2020EnglishRFQ ASK 3 days (Handheld and body-worn wireless communication equipment evaluation procedures for electromagnetic exposure to the human body Part 1: Equipment used close to the ear (frequency range 300MHz to 6GHz)) YD/T 1644.1-2020 Valid YDT 1644.1-2020
YD/T 1644.1-2007English575 Add to Cart 0-9 seconds. Auto delivery. Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices-Human models, instrumentation, and procedures - Part 1: Procedure to determine the specific absorption rate (SAR) for hand-held devices used in close p YD/T 1644.1-2007 Obsolete YDT 1644.1-2007



YD/T 1644.1-2020: PDF in English (YDT 1644.1-2020)
YD/T 1644.1-2007 YD Telecommunication Industry Standard Of the People’s Republic of China Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices - Human models, instrumentation, and procedures Part 1. Procedure to determine the specific absorption rate (SAR) for hand-held devices used in close proximity to the ear (frequency range of 300 MHz to 3 GHz) ISSUED ON. JULY 20, 2007 IMPLEMENTED ON. DECEMBER 1, 2007 Issued by. Ministry of Industry Information Technology, the People’s Republic of China 3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes. Table of contents Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Symbols and abbreviated terms ... 15 5 Measurement system specifications ... 16 6 Protocol for SAR assessment ... 22 7 Uncertainty estimation ... 32 8 Measurement report ... 50 Annex A (normative) Phantom specifications ... 52 Annex B (normative) Calibration of the measurement instrumentation and uncertainty estimation ... 58 Annex C (normative) Post-processing techniques and uncertainty estimation ... 75 Annex D (normative) SAR measurement system validation ... 81 Annex E (informative) Inter-laboratory comparisons ... 88 Annex F (informative) Definition of a phantom coordinate system and a device under test coordinate system ... 90 Annex G (informative) Validation dipoles ... 92 Annex H (informative) Flat phantom ... 94 Annex I (informative) Recommended recipes for phantom head tissue-equivalent liquids ... 96 Annex J (informative) Measurement of the dielectric properties of liquids and uncertainty estimation ... 98 Bibliography ... 109 Foreword This Standard is one of Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices Part Standard, and its name and it is consist of the following parts. 1. Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices - Human models, instrumentation, and procedures - Part 1. Procedure to determine the specific absorption rate (SAR) for hand-held devices used in close proximity to the ear (frequency range of 300 MHz to 3 GHz) 2. Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices - Human models, instrumentation, and procedures - Part 1. Procedure to determine the specific absorption rate (SAR) for hand-held devices used in close proximity to the ear (frequency range of 300 MHz to 6 GHz) This Standard is equivalent to IEC 62209-1 (2005). Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices - Human models, instrumentation, and procedures - Part 1. Procedure to determine the specific absorption rate (SAR) for hand-held devices used in close proximity to the ear (frequency range of 300 MHz to 3 GHz). This Standard is Part 1. Appendix A, B, C and D are normative appendixes, Appendix E, F, G, H, I and J are informative appendixes. This Standard is proposed and managed by China Communication Standardization Association. This Standard is prepared by MIIT Telecommunication Institute. This Standard is written by. Wang Hongbo, Wang Nana, Qi Dianyuan, Wu Tongning, and Wun Qian. HUMAN EXPOSURE TO RADIO FREQUENCY FIELDS FROM HAND-HELD AND BODY-MOUNTED WIRELESS COMMUNICATION DEVICES – HUMAN MODELS, INSTRUMENTATION, AND PROCEDURES Part 1. Procedure to determine the specific absorption rate (SAR) for hand-held devices used in close proximity to the ear (frequency range of 300 MHz to 3 GHz) 1 Scope This Standard defines the procedure to determine the specific absorption rate (SAR) for hand-held devices used in close proximity to the ear. It applies to any electromagnetic field (EMF) transmitting device intended to be used with the radiating part of the device in close proximity to the human head and held against the ear, including mobile phones, cordless phones, etc. The frequency range is 300 MHz to 3 GHz. The objective of this Standard is to specify the measurement method for demonstration of compliance with the specific absorption rate (SAR) limits for such devices. The standard is about the measurement method, rather than the safety thresholds. 2 Normative references The following standards contribute to the stipulation of this specification after being quoted. All the revision versions (excluding correction version) of the quoted standards specified with date are not applicable for this Standard. However, parties that have come to agreements based on this Standard are encouraged to explore the possibility to use the latest versions of the following standards. The latest version of the quoted documents without date specified is applicable for this specification. ISO/IEC Guide. 1995, Guide to the Expression of Uncertainty in Measurement ISO/IEC 17025. 1999, General requirements for the competence of testing and calibration laboratories 3 Terms and definitions For the purposes of this Standard, the following terms and definitions apply. 3.1 attenuation coefficient numerical factor intended to account for attenuation due to the human head or body tissue between the source and a specified point. 3.2 average (temporal) absorbed power value of the time-averaged rate of energy transfer given by. Where - is the average power in watts. t1 - is the start time of the exposure in seconds; t2 - is the stop time of the exposure in seconds; t2 – t1 - is the exposure duration in seconds; P(t) - is the instantaneous absorbed power in watts; 3.3 axial isotropy the maximum deviation of the SAR when rotating around the major axis of the probe cover/case while the probe is exposed to a reference wave impinging from a direction along the probe major axis. 3.4 basic restriction restrictions on human exposure to time-varying electric, magnetic, and electromagnetic fields that are based directly on established health effects. NOTE. Within the frequency range of this Standard, the physical quantity used as a basic restriction is the specific absorption rate (SAR). 3.5 boundary effect (probe) A change in the sensitivity of an electric-field probe when the probe is located close to (less than one probe-tip diameter) media boundaries. 3.6 wireless device shall be set to transmit at its highest power level for the conditions of use next to the ear. The exposure tests shall be based on the functional and exposure characteristics of the test devices, e.g., operating modes, antenna configurations, etc. Whenever possible, final commercial product versions shall be tested using all normal operational configurations, e.g., without any cables attached. Cables attached to a product are very likely to alter the transmitter RF current distribution on metallic and conducting portions of the product. Additionally, if tests are performed using prototypes, it shall be verified that the commercial version has exactly the same mechanical and electrical characteristics as the tested prototype. If this cannot be guaranteed, testing shall be repeated by sampling of unmodified commercial product versions. If operation of the DUT at the highest time-averaged power level is not possible, the test may be performed at lower power and results then scaled to the maximum output power, provided that the DUT SAR response is linear. 6.1.4 Position of the wireless device in relation to the phantom 6.1.4.1 General considerations This Standard specifies two handset test positions against the head phantom – the “cheek” position and the “tilt” position. These two test positions are defined in the following sub-clauses. The handset should be tested in both of these positions on left and right sides of the SAM phantom. If handset construction is such that the handset positioning procedures described in 6.1.4.2 and 6.1.4.3 to represent normal-use conditions cannot be used, e.g., some asymmetric handsets, alternative alignment procedures should be adapted... ......

BASIC DATA
Standard ID YD/T 1644.1-2020 (YD/T1644.1-2020)
Description (Translated English) (Handheld and body-worn wireless communication equipment evaluation procedures for electromagnetic exposure to the human body Part 1: Equipment used close to the ear (frequency range 300MHz to 6GHz))
Sector / Industry Telecommunication Industry Standard (Recommended)
Classification of Chinese Standard M04
Classification of International Standard 33.100
Word Count Estimation 199,161
Date of Issue 2020-04-16
Date of Implementation 2020-07-01
Summary This standard specifies procedures for the evaluation of the peak spatially averaged SAR by repeatable measurements using a simplified model of the head. This standard applies to electromagnetic field (EMF) emitting devices used close to the ear (the transmitting unit of which is close to the head), such as: mobile phones, cordless phones, some types of (head-worn) headphones, etc. When this standard assesses the head peak spatial SAR, a conservative assessment should be given with limited uncertainty for a significant population of people who normally use these devices. The frequency range of this standard is 300 MHz to 6 GHz.