IEC 62479 pdf download.Assesment of the compliance of low-power electronic and electrical equipment with the basic restrictions related to human exposure to electromagnetic fields (10 MHz to 300 GHz)
1 Scope
This International Standard provides simple conformity assessment methods for low-power electronic and electrical equipment to an exposure limit relevant to electromagnetic fields (EMF). If such equipment cannot be shown to comply with the applicable EMF exposure requirements using the methods included in this standard for EMF assessment, then other standards, including IEC 6231 1 or other (EMF) product standards, may be used for conformity assessment.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 available antenna power the maximum power, averaged over a time interval equal to the averaging time, supplied to the antenna feed line that can be theoretically delivered by a source having an impedance of positive real part to a directly connected load when the impedance of the load is widely varied NOTE 1 The available antenna power is obtained when the resistance of the load is equal to that of the source and its reactance is equal in magnitude but of opposite sign. However, other scenarios are possible e.g. if the PA monitors the current rather than the actual power, a changing antenna impedance (when DUT is operated close to the body) might actually cause a higher output power than the matched load. Then, a push-pull analysis with varied realistic loads (according to antenna impedance in the vicinity of the body) should be performed. NOTE 2 In some cases, conditions such as overheating or overvoltage prevent the available antenna power from being obtained. NOTE 3 Time average shall be taken during continuous or maximum duty cycle transmission at maximum power to the extent possible for a given technology. NOTE 4 Adapted from IEC 60050-702:1 992 [1 1 ] 1) , 702-07-1 0. NOTE 5 Antenna feed line is defined by IEC 60050-71 2:1 992 [1 2], 71 2-06-01 .3.2 average total radiated power the time average of the total radiated power over a time interval equal to the averaging time. This time average is taken during continuous or maximum duty cycle transmission at maximum power to the extent possible for a given technology NOTE If the user is in the reactive near field of the antenna, the presence of the user may result in a change in the total radiated power due to a change in the antenna impedance. In this case, the average total radiated power must be the maximum possible power in the presence of the user. 3.3 averaging time t avg the appropriate time over which exposure is averaged for purposes of determining compliance with exposure limits 3.4 basic restriction restriction(s) on exposure to time-varying electric, magnetic, and electromagnetic fields that are based directly on established health effects NOTE Depending upon the frequency of the field, the physical quantities used to specify these restrictions are current density, specific absorption rate (SAR), and power density. 3.5 conformity assessment demonstration that specified requirements relating to a product, process, system, person or body are fulfilled NOTE The subject field of conformity assessment includes activities such as testing, inspection and certification, as well as the accreditation of conformity assessment bodies. [ISO 1 7000:2004 [1 4], definition 2.1 , modified]3.6 information technology equipment ITE any equipment which has a primary function of either (or a combination of) entry, storage, display, retrieval, transmission, processing, switching, or control, of data and of telecommunication messages and which may be equipped with one or more terminal ports typically operated for information transfer EXAMPLE Types of ITE include data processing equipment, office machines, electronic business equipment and telecommunication equipment. 3.7 low-power equipment equipment where the available antenna power and/or the average total radiated power is less than or equal to the low-power exclusion level 3.8 low-power exclusion level P max specified condition on device output power, which may also depend on other variables such as frequency and distance of radiating source from persons, such that the exposure level produced by the source will not exceed a specific basic restriction. If the device output power is less than P max , then the device is deemed to comply with the basic restrictions
IEC 62479 pdf download
