YD/T 2653-2013Product standard to demonstrate the compliance of short range devices(SRD) and similar applications related to human exposure to electromagnetic fields (1OHz~30MHz) (English PDF)

1 Scope

This Standard specifies the compliance of short-range devices and similar applications related to human exposure to electromagnetic fields.

This Standard applies to short-range devices and wireless devices for similar applications. The frequency range is 10Hz to 30MHz. Similar products such as wireless power supply equipment, near field communication equipment, radio frequency identification equipment can refer to this Standard.

2 Normative 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 edition of the referenced document (including any amendments) applies.

YD/T 2347-2011, Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure

IEC 62311-2008, Assessment of electronic and electrical equipment related to human exposure restrictions for electromagnetic fields (0Hz~300GHz)

IEC 62479-2010, Assessment of the compliance of low-power electronic and electrical equipment with the basic restrictions related to human exposure to electromagnetic fields

ICNIRP Guidelines-1998, Guidelines for Limiting Exposure to Time-Varying

Electric, Magnetic, and Electromagnetic Fields (up to 300GHz)

ICNIRP Guidelines-2010, Guidelines for Limiting Exposure to Time-Varying

Electric, Magnetic, and Electromagnetic Fields (1Hz~ 100kHz)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

SAR - The specific absorption rate, in watts per kilogram;

E - The rms value of the electric field strength in the tissue, in volts per meter;

sigma - The medium conductivity, in Siemens per meter;

rho - The tissue density, in grams per cubic meter;

ch - The specific heat capacity of tissue, in joules per kilogram and kelvins;

- The differential of temperature at the initial moment in the tissue with respect to time, in Kelvin per second.

4 Exposure limits

6 Assessment criteria

If the technology used in the equipment does not generate electric fields, magnetic fields or touch currents above the reference level values in the position normally occupied by the user (for example: there are no touchable conductive parts, or touchable conductive parts are permanently earthed), the device is then considered to meet the requirements of this Standard with respect to electric fields, magnetic fields or touch currents without further evaluation.

Laboratory measurement techniques and computational modeling can be used for demonstration of compliance with the limits.

Use the phase center of the probe as the reference point for the test distance. Usually, the test is carried out at a distance of 30cm from the phase center of the measuring probe to the boundary of the device under test. Or test according to the usage distance declared by the manufacturer. This manufacturer's declaration needs to be documented in the report.

For very localized sources of exposure, within a few centimeters of the body, a realistic approach when conducting exposure assessments is to assess doses to induced electric fields on a case-by-case basis. When the distance becomes larger, the localization of the field distribution will weaken. If the distribution is still non-uniform, the exposure of the body or part of the body can be spatially averaged. Compare with the reference levels.

For the assessment of short-range devices used in industry and workplaces, occupational exposure limitations shall be followed.

For the assessment of short-range devices other than work and medical applications, public exposure limitations shall be followed.

Determine the specific test configuration according to the different configurations of short-range devices. Measure the maximum electromagnetic exposure value. The assessment of exposure shall be representative of the test set-up for the typical operating conditions of short-range devices. Record the test arrangement in the report. For the exposure assessment of wireless power supply equipment, it shall be carried out according to the test arrangement specified in Annex B. For the exposure assessment of near-field communication equipment, follow the test arrangement specified in Annex

C. For the exposure assessment of radio frequency identification equipment, according to the test arrangement specified in Annex D.

Annex C (normative)

Electromagnetic exposure assessment of near field communication equipment