RF expo evaluation

FCC ID: 2AKCY-RL56069BLE

RF Exposure Info

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FCCID_4448324

FCC ID: 2AKCY-RL56069BLE

RF Exposure Evaluation
Limits
The criteria listed in the following table shall be used to evaluate the environment impact of human exposure
to radio frequency (RF) radiation as specified in 1.1307(b)
Limits for Maximum Permissible Exposure (MPE)
Electric field
Frequency range Magnetic field strength Power density Averaging time
strength 2
(MHz) (A/m) (mW/cm ) (minutes)
(V/m)
(A) Limits for Occupational/Controlled Exposures
0.3–3.0 614 1.63 *(100) 6
2
3.0–30 1842/f 4.89/f *(900/f ) 6
30–300 61.4 0.163 1.0 6
300–1500 f/300 6
1500–100,000 5 6
(B) Limits for General Population/Uncontrolled Exposure
0.3–1.34 614 1.63 *(100) 30
2
1.34–30 824/f 2.19/f *(180/f ) 30
30–300 27.5 0.073 0.2 30
300–1500 f/1500 30
1500–100,000 1.0 30
f = frequency in MHz
2
Friis transmission formula: Pd = (Pout*G)/(4*pi*r )

Where
2
Pd = power density in mW/cm , Pout = output power to antenna in mW;
G = gain of antenna in linear scale, Pi = 3.1416;
R = distance between observation point and center of the radiator in cm

2
Pd id the limit of MPE, 1 mW/cm . If we know the maximum gain of the antenna and the total power input to
the antenna, through the calculation, we will know the distance r where the MPE limit is reached.
Test Procedure
Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest
channel individually.

Test Result of RF Exposure Evaluation

BLE mode

Output power to Power Density at Limit
Channel 2 2 Result
antenna (mW) R=20cm (mW/cm ) (mW/cm )

Lowest (2402MHz) 2.82 0.00010 1.0 PASS

Middle (2440MHz) 3.55 0.0013 1.0 PASS

Highest (2480MHz) 4.04 0.0014 1.0 PASS

Remark: antenna gain=2.51dBi

Document Created: 2019-09-18 18:09:37
Document Modified: 2019-09-18 18:09:37

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