BS EN 62369-1:2009 Evaluation of human exposure to electromagnetic fields from short range devices (SRDs) in various applications over the frequency range 0 GHz to 300 GHz. Fields produced by devices used for electronic article surveillance, radio frequency identification and similar systems
BS EN 62369-1 presents procedures for the evaluation of human exposure to electromagnetic fields (EMFs) from devices used in electronic article surveillance (EAS), radio frequency identification (RFID) and similar applications. It adopts a staged approach to facilitate compliance assessment. The first stage (Stage 1) is a simple measurement against the appropriate derived reference values. Stage 2 is a more complex series of measurements or calculations, coupled with analysis techniques. Stage 3 requires detailed modelling and analysis for comparison with the basic restrictions. When assessing any device, the most appropriate method for the exposure situation may be used.
Electronic article surveillance, radio frequency identification and similar systems do not normally operate at frequencies below 1 Hz or above 10 GHz. EMF exposure guidelines and standards can cover a wider range of frequencies, so clarification on the required range is included as part of the evaluation procedures.
BS EN 62369-1 does not include limits. Limits can be obtained from separately published human exposure guidelines. Different guidelines and limit values may apply in different regions. Linked into the guidelines are usually methods for summation across wider frequency ranges and for multiple exposure sources. These should be used. A simplified method for summation of multiple sources is contained in Annex C. This has to be used with care as it is simplistic and will overestimate the exposure; however it is useful as a guide, when the results of different evaluations are in different units of measure which are not compatible.
Contents of BS EN 62369-1:
- Introduction
- Scope
- Normative references
- Terms, definitions, and abbreviations
- Quantities
- Constants
- Terms and definitions
- Measurements and calculations for equipment evaluation
- Introduction
- Evaluation against reference values
- General
- Direct measurement for comparison against reference values
- Spatial measurements for comparison against reference values
- Modelling and analysis including field non-uniformity
- Specific absorption rate (SAR) measurements
- General
- Internal electric field strength measurements
- Internal temperature measurements
- Calorimetric measurements of heat transfer
- Phantom models and fluid
- Numerical evaluations for comparison against basic restrictions
- General
- Evaluations using homogeneous models
- Special case of inductive near-field exposure 100 kHz to 50 MHz
- Frequencies > 50 MHz
- Localised SAR (100 kHz to 10 GHz)
- Evaluations using non-homogeneous models for comparison against basic restrictions
- General
- Anatomical body models
- Calculation/modelling method
- Position of the body in relation to the unit under evaluation
- Measurement of limb and touch currents
- Measurements for field monitoring
- General
- Field measurements
- Measurement where persons spend significant periods of time
- Detailed measurements for non-transitory exposure
- Additional evaluation
- Exposure from sources with multiple frequencies or complex waveforms
- Exposure from multiple sources
- Uncertainty
- General
- Evaluating uncertainties
- Individual uncertainties
- Combining uncertainties
- Examples of typical uncertainty components
- Measurement
- Numerical calculation
- Overall uncertainties
- Evaluation report
- Characteristics of equipment
- Information for numerical modelling
- A simplified method for summation of multiple sources
- Uncertainty
- Bibliography
