YD/T 1644.1-2020 (YD/T1644.1-2020, YDT 1644.1-2020, YDT1644.1-2020) & related versions
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| YD/T 1644.1-2020 | English | RFQ |
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(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))
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YD/T 1644.1-2020
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YDT 1644.1-2020
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| YD/T 1644.1-2007 | English | 575 |
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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
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YD/T 1644.1-2007
| Obsolete |
YDT 1644.1-2007
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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
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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...
......
| 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. |
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