zmp

MPE

Topvision(Shenzhen) Technology Co., LTD MR12 Video Doorbell 2AYIT-MR12 2AYITMR12 mr12

Topvision(Shenzhen) Technology Co., LTD MR12 2AYIT-MR12 2AYITMR12 mr12

PDF Viewing Options

Not Your Device? Search For Manuals or Datasheets below:


File Info : application/pdf, 2 Pages, 91.45KB

Document DEVICE REPORTGetApplicationAttachment.html?id=7384060 
FCC ID: 2AYIT-MR12

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 KDB 447498 D01 V06 and 1.1307(b)

Limits for Maximum Permissible Exposure (MPE)

Frequency range (MHz)

Electric field strength (V/m)

Magnetic field strength (A/m)

Power density (mW/cm2)

Averaging time (minutes)

(A) Limits for Occupational/Controlled Exposures

0.3­3.0

614

1.63

*(100)

6

3.0­30

1842/f

4.89/f

*(900/f2)

6

30­300

61.4

0.163

1.0

6

300­1500

f/300

6

1500­100,000

5

6

(B) Limits for General Population/Uncontrolled Exposure

0.3­1.34

614

1.63

*(100)

30

1.34­30

824/f

2.19/f

*(180/f2)

30

30­300

27.5

0.073

0.2

30

300­1500

f/1500

30

1500­100,000

1.0

30

f = frequency in MHz Friis 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 center of the radiator in cm

Pd id the limit of MPE, 1 mW/cm2. 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.

EIRP=EMeas+20log(dMeas)-104.7

EIRP

is the equivalent isotropically radiated power, in dBm

EMeas

is the field strength of the emission at the measurement distance, in dBV/m

dMeas

is the measurement distance, in m

Test Result of RF Exposure Evaluation

wifi 2.4G mode
Channel
802.11b 802.11g 802.11n HT20 802.11n HT40

Output power to antenna (dBm) 16.731 13.6 14.464 13.713

Output power to antenna (mW)

Power Density at R=20cm (mW/cm2)

47.1086

0.01202

22.9087

0.00584

27.9512

0.00713

23.5126

0.00600

Limit (mW/cm2)
1.0 1.0 1.0 1.0

Result
PASS PASS PASS PASS

Remark: antenna gain=1.08dBi

For BT

Field strength (dBuV/m)

EIRP (dBm)

84.64

-10.52

Remark: antenna gain=1.08dBi

Max tune-up (mW)
0.0887

Power Density at R=20cm (mW/cm2)
0.00002

Limit (mW/cm2) 1.0

Result PASS

For 433.92MHz

Field strength (dBuV/m)

EIRP (dBm)

62.36

-32.8

Remark: antenna gain=0.55dBi

Max tune-up (mW)
0.0005

Power Density at R=20cm (mW/cm2)
0.0000001

Limit (mW/cm2) 0.2

Result PASS

For Simultaneous transmitting, 1): The sum of the ratios of the spatially averaged results to the applicable frequency dependent MPE limits =0.01202/1 +0.00002/1 + 0.0000001/0.2 = 0.0120405< 1 Since the sum of the MPE ratios for all simultaneously transmitting antennas incorporated in the device is  1.0, the EUT is considered to satisfy MPE compliance for simultaneous transmission operations.

Related FCC IDs:

Search Any Device: