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Report No.: EM201200637-2 Application No.: ZJ00022731 Page 7 of 18
3. TECHNICAL REQUIREMENTS SPECIFICATION IN EN 62311
3.1 GENERAL DESCRIPTION OF APPLIED STANDARDS
EN 62311 Generic standard to demonstrate the compliance of electronic and electrical
apparatus with the basic restrictions related to human exposure to electromagnetic fields (0
Hz–300 GHz) is to demonstrate the compliance of apparatus with the basic restrictions or
reference levels on exposure of the general public related to electric, magnetic,
electromagnetic fields as well as induced and contact current.
apparatus with the basic restrictions related to human exposure to electromagnetic fields (0
Hz–300 GHz) is to demonstrate the compliance of apparatus with the basic restrictions or
reference levels on exposure of the general public related to electric, magnetic,
electromagnetic fields as well as induced and contact current.
3.2 RF EXPOSURE EVALUATION
3.2.1 LIMIT:
According to EN 62311, If the average power emitted by the base station is less than or
equal to 20 mW then the base station is deemed to comply without testing.
equal to 20 mW then the base station is deemed to comply without testing.
If the average power emitted by the base station is less than or equal to 20 mW then the
base station is deemed to comply without testing.
base station is deemed to comply without testing.
If the average power emitted by the base station is more than 20 mW, then E, H or SAR
calculations and/or measurements shall be performed according to Clause 4. The results
of
of
calculations and/or measurements shall be compared directly to the limits.
The product is deemed to fulfil the requirements of this standard if the calculated and/or
measured
measured
values are less than or equal to the limits.
NOTE In the setting of basic restrictions and the derived reference levels, safety factors
have been taken into account. In the specification of the assessment method, uncertainty
has been constrained. This is the reason for not requiring that the measured values shall
be compared to the limit reduced by the measurement uncertainty.
Test conclusion:
MPE calculate procedure:
have been taken into account. In the specification of the assessment method, uncertainty
has been constrained. This is the reason for not requiring that the measured values shall
be compared to the limit reduced by the measurement uncertainty.
Test conclusion:
MPE calculate procedure:
According to the formula S =
2
4 R
PG
π
Where: S = power density (in appropriate units, e.g. mW/cm
2
)
P = power input to the antenna (in appropriate units, e.g., mW)
G = power gain of the antenna in the direction of interest relative to an isotropic
radiator.
R = distance to the center of radiation of the antenna (appropriate units, e.g., cm)
And the limit of table 2 of Council Recommendation 1999/519/EC
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