RF EXPOSURE EVALUATION
KDB 447498 D01 Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies v06.
Introduction
According to FCC 1.1310: 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)
EUT Specification
| FCC ID | 2A7VD-H6097 |
|---|---|
| EUT | Govee TV Backlight 3 Lite |
| Frequency band (Operating) |
|
| Device category |
|
| Exposure classification |
|
| Antenna diversity |
|
| Antenna gain (Max) | 3.18 dBi |
| Evaluation applied |
|
Limits for Maximum Permissible Exposure (MPE)
| Frequency Range(MHz) | Electric Field Strength(V/m) | Magnetic Field Strength(A/m) | Power Density(mW/cm²) | Average Time |
|---|---|---|---|---|
| (A) Limits for Occupational/Control Exposures | ||||
| 300-1500 | -- | -- | F/300 | 6 |
| 1500-100000 | -- | -- | 5 | 6 |
| (B) Limits for General Population/Uncontrol Exposures | ||||
| 300-1500 | -- | -- | F/1500 | 6 |
| 1500-100000 | -- | -- | 1 | 30 |
Friis transmission formula
Pd=(Pout*G)/(4*pi*R²)
Where:
Pd= Power density in mW/cm²Pout= output power to antenna in MwG= gain of antenna in linear scalePi= 3.1416R= distance between observation point and center of the radiator in cm
Pd is the limit of MPE (1mW/cm²). If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached.
Max Measurement Result
| Operating Mode | Measured Power (dBm) | Tune up tolerance (dBm) | Max. Tune up Power (dBm) | Antenna Gain (dBi) | Power density at 20cm (mW/ cm²) | Power density Limits (mW/cm²) |
|---|---|---|---|---|---|---|
| BLE | -0.70 | ±1 | 0.30 | 3.18 | 0.0004 | 1 |
Result: No Standalone SAR test is required.
Compliance Laboratory Information
Shenzhen Anbotek Compliance Laboratory Limited
Address: 1/F., Building D, Sogood Science and Technology Park, Sanwei Community, Hangcheng Street, Bao'an District, Shenzhen, Guangdong, China.
Tel:(86)0755-26066440 Fax:(86)0755-26066440 mail:service@anbotek.com
Hotline: 400-003-0500
Website: www.anbotek.com.cn
