RF Exposure

FCC ID: PBR-SZG3APWC

RF Exposure Info

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FCCID_3994815

www.tuv.com Appendix 10 Prüfbericht - Nr.: Seite 1 von 3 19660379/380 001 Page 1 of 3 Test Report No. RF Exposure Report RF Exposure Measurement The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The gain of the antennas used in the product is extracted from the Antenna data sheets provided and also the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. Although the Friis Transmission formula is far field assumption, the calculated result of that is an over- prediction for near field power density. It is taken as worst case to specify the safety range. RF Exposure Limit According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of the human exposure to radio-frequency (RF) radiation as specified in 1.1307 (b) Limits for Maximum Permissible Exposure (MPE) Frequency Range Electric Field Magnetic Field Power Density (MHz) Strength (V/m) Strength (A/m) (mW/cm²) Limits for Occupational / controlled Exposures 300 - 1500 -- -- F/300 1500 – 100000 -- -- 5.0 Limits for General population / Uncontrolled Exposure 300 - 1500 -- -- F/1500 1500 – 100000 -- -- 1.0 F= Frequency in MHz

www.tuv.com Appendix 10 Prüfbericht - Nr.: Seite 2 von 3 19660379/380 001 Page 2 of 3 Test Report No. Friss Formula Friss Transmission Formula: Pd = (Pout * G) / (4*pi*r²) Where Pd = power density in mW/cm² Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = Distance between observation point and the center of radiator in cm If we know the maximum gain of the antenna and the total output power to the antenna, through calculation, we will know MPE value at distance 20cm. EUT Operation condition EUT was enabled to transmit and receive at lowest, middle and highest channels. Classification The antenna of this product, under normal use condition, is at least 20cm away from the body of the user. Warning statement to the user for keeping at least 20cm or more separation distance from the antenna should be included in the User manual. So, this device is classified as Mobile device. Test Results 2.4 GHz Band Gain (G1) = 4.03 dBi = 2.51 (linear scale) Wi-Fi ZigBee 1 ZigBee 2 ZigBee 3 (6Mbps) BLE Sum Sum 2.4GHz mW mW mW mW mW mW dBm 1.690 78.162 78.162 11.040 0.907 169.96 22.30 1.555 69.984 69.984 11.967 0.833 154.323 21.88 1.538 12.302 12.302 11.376 0.760 38.278 15.82 Maximum possible power value = 1.690 + 78.162 + 78.162 + 11.967 + 0.907 = 170.88 mW Manufacturer has declared the tune-up value as ±1 dB is considered in MPE calculation. Maximum possible power value including tune up tolerance value = 170.88 + 1.25 = 172.13 mW = Pout1

www.tuv.com Appendix 10 Prüfbericht - Nr.: Seite 3 von 3 19660379/380 001 Page 3 of 3 Test Report No. 5 GHz Band Gain (G2) = 4.32 dBi = 2.7 (linear scale) Maximum power value = 37.239 mW Maximum power value including tune up tolerance value = 37.239 + 1.25 = 38.48 mW = Pout2 Worst Case Output Power Power Limit Frequency band Output Power to including tune- Density (mW/cm²) Antenna (mW) up (mW) (mW/cm²) 2.4 GHz 170.88 Pout1 = 172.13 Pd1 = 0.0859 1.000 5 GHz 37.239 Pout2 = 38.480 Pd2 = 0.0206 1.000 Friiss Transmission Formula: Pd = (Pout * G) / (4*pi*r²) Pd = [(Pout1* G1) + (Pout2* G2)] / [4*pi*r²] Pd = Pd1 + Pd2 = 0.1066 mW / cm²


Document Created: 2019-03-24 03:02:05
Document Modified: 2019-03-24 03:02:05
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