PD IEC/TR 62630:2010 Guidance for evaluating exposure from multiple electromagnetic sources
PD IEC/TR 62630 is a Technical Report which describes exposure evaluation concepts and techniques for the overall exposure level in spatial regions and occupants caused by the simultaneous exposure to multiple narrowband electromagnetic (EM) sources. Throughout PD IEC/TR 62630, it is assumed that the exposure evaluation occurs under static conditions, i.e., the source position and transmit-mode characteristics (e.g. emitted power, modulation scheme, etc.) of the device(s) under test do not vary significantly over the time required to carry out the evaluation using the chosen evaluation technique (e.g., field measurements).
The vast majority of wireless communication systems worldwide employ signalling schemes featuring narrowband waveforms occupying a frequency band not broader than 10 % of its central frequency. For information, Annex A presents the operating system bands and channel bandwidths of several common wireless services.
Wide-band communication systems, e.g., ultra-wideband (UWB) systems employing impulsive waveforms with fractional bandwidth well in excess of 10 %, are relatively new to the marketplace, have experienced limited deployment so far, and are not typically regarded as significant contributors to EM exposure levels due to low transmit power levels.
Contents of PD IEC/TR 62630:
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
3.2 Physical quantities
3.3 Constants
3.4 Abbreviations
3.5 Vector notations
4 Overview
5 Classification of devices and EM sources
5.1 General aspects
5.2 Device classification based on the intended use: user-centric versus nodecentric
5.3 EM source classification: single-channel versus band-wide transmitters
6 Combined exposure from multiple narrowband EM sources
6.1 Guidance on the selection of the exposure summation approach
6.2 Correlation between signals emitted by different EM sources
6.3 Relevant exposure metrics
6.4 Combined exposure from uncorrelated EM sources
6.5 Combined exposure evaluation of correlated EM sources
6.5.1 Accurate estimate of the true field vector sum
6.5.2 Conservative combined exposure evaluation using scalar sensors
Annex A (informative) Frequency allocations for some common wireless services
Annex B (informative) Supporting analytical details
Annex C (informative) Examples of combined exposure evaluations
Bibliography