RM-612PLUS Portable Battery Speaker RF Exposure Info MPE report RUIMA INTERNATIONAL (HK) INDUSTRIAL CO., LIMITED

RUIMA INTERNATIONAL (HK) INDUSTRIAL CO., LIMITED Portable Battery Speaker

Page 1 of RM-612PLUS Portable Battery Speaker RF Exposure Info MPE report RUIMA INTERNATIONAL (HK) INDUSTRIAL CO., LIMITED
Page 2 of RM-612PLUS Portable Battery Speaker RF Exposure Info MPE report RUIMA INTERNATIONAL (HK) INDUSTRIAL CO., LIMITED

BSL11383902RF
RF Exposure Report
FCC ID: 2AHSJ-RM-612PLUS
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)
F= Frequency in MHz
Frequency Range
Electric Field
Magnetic Field
(MHz)
Strength (V/m)
Strength (A/m)
Limits for Occupational / controlled Exposures
300 - 1500
--1500 – 100000
--Limits for General population / Uncontrolled Exposure
300 - 1500
--1500 – 100000
---
One
Power Density
(mW/cm²)
F/300
5.0
F/1500
1.0
BSL11383902RF
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.
BT (BLE):
ANT Gain (G) 0dBi (1)
2402-2480MHz:
Channel
Output Power
Output Power
Protocol
Frequency
(MHz)
to Antenna
(dBm)
to Antenna
(mW)
Power Density
(mW/cm²)
Limit
(mW/cm²)
Low
2402
-4.62
0.35
0.00007
1.000
Middle
2442
-3.06
0.49
0.00010
1.000
Hight
2480
-4.31
0.37
0.00007
1.000
MPE limit S: 1mW/ cm2
The MPE is calculated as 0.00010mW / cm2 < limit 1 mW / cm2. So, RF exposure limit warning or SAR test are not
required.
The EUT will only be used with a separation of 20cm or greater between the antenna and nearby persons and can
therefore be considered a mobile transmitter per 47 CFR2.1091 (b).
The RF Exposure Information page from the manual is included here for reference.
Two
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Document ID4006616
Application IDCGJfibnc3ilu7zaKIc4MEw==
Document DescriptionMPE report
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeRF Exposure Info
Display FormatAdobe Acrobat PDF - pdf
Filesize6.66kB (83265 bits)
Date Submitted2018-09-14 00:00:00
Date Available2018-09-14 00:00:00
Creation Date2018-08-29 18:47:07
Document Lastmod2018-08-29 18:47:07
Document TitleMPE report
Document CreatorWPS Office
Document Author: user

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Create Date                     : 2018:08:29 18:47:07+10:47
Creator                         : WPS Office
Modify Date                     : 2018:08:29 18:47:07+10:47
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