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-powerelectronic and electrical equipment to an exposure limit relevant to electromagnetic fields(EMF). If such equipment cannot be shown to comply with the applicable EMF exposurerequirements using the methods included in this standard for EMF assessment,then otherstandards,including lEC 62311 or other(EMF) product standards, may be used for conformityassessment.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 62311，Assessment of electronic and electrical equipment related to human exposurerestrictions for electromagnetic fields (0 Hz – 300 GHz)
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 tothe antenna feed line that can be theoretically delivered by a source having an impedance ofpositive 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 sourceand its reactance is equal in magnitude but of opposite sign. However, other scenarios are possible e.g. if the PAmonitors the current rather than the actual power, a changing antenna impedance (when DUT is operated close tothe body) might actually cause a higher output power than the matched load. Then, a push-pull analysis with variedrealistic 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 frombeing obtained.
NOTE 3 Time average shall be taken during continuous or maximum duty cycle transmission at maximum powerto the extent possible for a given technology.
NOTE4Adapted from lEc 60050-702:1992 [11]1),702-07-10.
NOTE 5 Antenna feed line is defined by IEC 60050-712:1992[12],712-06-01.
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 atmaximum power to the extent possible for a given technology
NOTE lf the user /s in the reactive near field of the antenna, the presence of the user may result in a change inthe total radlated power due to a change in the antenna impedance. in this case, the average total radiated powermust be the maximum possible power in the presence of the u5er.
3.3
averaging timeavg
the appropriate time over which exposure is averaged for purposes of determining compliancewith exposure limits
3.4
basic restriction
restriction(s) on exposure to time-varying electric, magnetic, and electromagnetic fields that are baseddirectly on established health effects
NOTE Depending upon the frequency of the field,the physical quantities used to specifry these restrictions arecurrent density,specific absorption rate (SAR),and power density.
3.5
conformity assessment
demonstration that specified requirements relating to a product，process,system,person orbody are fulfilled
NOTE The subject field of conformity assessment includes activities such as testing, inspection and certification,as well as the accreditation of contormity assessment bodies.
[IsO 17000:2004[14]. definition 2.1,modified]
3.6
information technology equipmentITE
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 oftelecommunication messages and which may be equipped with one or more terminal portstypically operated for information transfer
EXAMPLE Types of lTE include data processing equipment,office machines，electronic business equipment andtelecommunication equipment.
3.7
low-power equipment
equipment where the available antenna power and/or the average total radiated power is lessthan or equal to the low-power exclusion level
3.8
low-power exclusion levelPmax..
specified condition on device output power,which may also depend on other variables suchas frequency and distance of radiating source from persons,such that the exposure levelproduced by the source will not exceed a specific basic restriction. lf the device output poweris less than Pmax. then the device is deemed to comply with the basic restrictions
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)
