RF Exposure

FCC ID: 2AP7Z-B66954804

RF Exposure Info

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                                       RF Exposure Requirement

According to KDB680106 D01 RF Exposure Wireless Charging Apps v03 (04/09/2018),
the requirement of RF exposure for the Wireless Charging device shall be met.

The RF exposure requirements must be determined in conjunction with the device
operating characteristics, according to the mobile and portable exposure requirements
in Sections 2.1091 and 2.1093 of the rules. SAR and MPE limits do not cover the
frequency range for wireless power transfer applications which operate below 100 kHz
and 300 kHz respectively; therefore, RF exposure compliance needs to be determined
with respect to Sections 1.1307 (c) and (d) of the FCC rules.

For devices designed for typical desktop applications, such a wireless charging pads,
RF exposure evaluation should be conducted assuming a user separation distance of
15 cm. E and H field strength measurements or numerical modeling may be used to
demonstrate compliance. Measurements should be made from all sides and the top of
the primary/client pair, with the 15 cm measured from the center of the probe(s) to the
edge of the device. Emissions between 100 kHz to 300 kHz should be assessed versus
the limits at 300 kHz in Table 1 of Section 1.1310: 614 V/m and 1.63 A/m.


                   Table 1 – Limits for Maximum Permissible Exposure (MPE)
 Frequency range     Electric field strength   Magnetic field strength   Power density      Averaging time
                                                                                  2
      (MHz)                   (V/m)                    (A/m)               (mW/cm )           (minutes)
                             (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
     1.34-30                  824/f                    2.19/f               *(180/f2)            30
     30-300                   27.5                     0.073                     0.2             30
    300-1500                                                                    f/1500           30
   1500-100,000                                                                  1.0             30

    Note: f denotes for frequency in MHz




FCC ID: 2AP7Z-B66954804


Test Method for H-field:
Measurements are conducted with a magnetic field probe located 15cm surrounding
away from the EUT and its associated attachments, including 20 cm above the top
surface from the EUT for scanning the emissions.



Test Setup:




                      2




      3           EUT        1




                        4
                                                          Exposure Level Meter

                            15cm


   5.Top of EUT

   6. Bottom of EUT




FCC ID: 2AP7Z-B66954804


Test Method for E-field:
Measurements are conducted with a electric field probe located 15cm surrounding away
from the EUT and its associated attachments, including 20 cm above the top surface
from the EUT for scanning the emissions.




                         2



             3               1



                         4

                                                             Exposure Level Meter

                             15cm


      5.Top of EUT

      6. Bottom of EUT




FCC ID: 2AP7Z-B66954804


Test Result
Charging Status: 1%


                          All measurement at defined as f= 115kHz

        Magnetic Field (H-Field) strength at 15cm from the boundaries of the EUT
       EUT location       Measured        Limit (A/m)   50%of Limit     Margin
                          H-field (A/m)
       Front (1)          0.32            1.63          0.815           -0.495
       Left (2)           0.30            1.63          0.815           -0.515
       Right (4)          0.35            1.63          0.815           -0.465
       Back (3)           0.34            1.63          0.815           -0.475
       Bottom             0.42            1.63          0.815           -0.395

        Magnetic Field (H-Field) strength at 20cm above the top surface from the EUT

       EUT location       Measured        Limit (A/m)   50%of Limit     Margin (A/m)
                          H-field (A/m)
       Top                0.45            1.63          0.815           -0.365

         Electric Field (E-Field) strength at 15cm from the boundaries of the EUT
       EUT location       Calculated      Limit (V/m)   50%of Limit     Margin (V/m)
                          E-field (V/m)
       Front (1)          0.26            614.0         307.0           -306.74
       Left (2)           0.25            614.0         307.0           -306.75
       Right (4)          0.28            614.0         307.0           -306.72
       Back (3)           0.24            614.0         307.0           -306.76
       Bottom             0.40            614.0         307.0           -306.60

         Electric Field (E-Field) strength at 20cm above the top surface from the EUT

       EUT location       Measured        Limit (V/m)   50%of Limit     Margin (V/m)
                          E-field (V/m)
       Top                0.43            614.0         307.0           -306.57




FCC ID: 2AP7Z-B66954804


Test Result
Charging Status: 50%


                          All measurement at defined as f= 115kHz

        Magnetic Field (H-Field) strength at 15cm from the boundaries of the EUT
       EUT location       Measured        Limit (A/m)   50%of Limit     Margin
                          H-field (A/m)
       Front (1)          0.35            1.63          0.815           -0.465
       Left (2)           0.36            1.63          0.815           -0.455
       Right (4)          0.35            1.63          0.815           -0.465
       Back (3)           0.38            1.63          0.815           -0.435
       Bottom             0.41            1.63          0.815           -0.405

        Magnetic Field (H-Field) strength at 20cm above the top surface from the EUT

       EUT location       Measured        Limit (A/m)   50%of Limit     Margin (A/m)
                          H-field (A/m)
       Top                0.42            1.63          0.815           -0.395

         Electric Field (E-Field) strength at 15cm from the boundaries of the EUT
       EUT location       Calculated      Limit (V/m)   50%of Limit     Margin (V/m)
                          E-field (V/m)
       Front (1)          0.25            614.0         307.0           -306.75
       Left (2)           0.25            614.0         307.0           -306.75
       Right (4)          0.23            614.0         307.0           -306.77
       Back (3)           0.26            614.0         307.0           -306.74
       Bottom             0.38            614.0         307.0           -306.62

         Electric Field (E-Field) strength at 20cm above the top surface from the EUT

       EUT location       Measured        Limit (V/m)   50%of Limit     Margin (V/m)
                          E-field (V/m)
       Top                0.39            614.0         307.0           -306.61




FCC ID: 2AP7Z-B66954804


Test Result
Charging Status: 99%


                          All measurement at defined as f= 115kHz

        Magnetic Field (H-Field) strength at 15cm from the boundaries of the EUT
       EUT location       Measured        Limit (A/m)   50%of Limit     Margin
                          H-field (A/m)
       Front (1)          0.33            1.63          0.815           -0.485
       Left (2)           0.32            1.63          0.815           -0.495
       Right (4)          0.32            1.63          0.815           -0.495
       Back (3)           0.35            1.63          0.815           -0.465
       Bottom             0.34            1.63          0.815           -0.475

        Magnetic Field (H-Field) strength at 20cm above the top surface from the EUT

       EUT location       Measured        Limit (A/m)   50%of Limit     Margin (A/m)
                          H-field (A/m)
       Top                0.39            1.63          0.815           -0.425

         Electric Field (E-Field) strength at 15cm from the boundaries of the EUT
       EUT location       Calculated      Limit (V/m)   50%of Limit     Margin (V/m)
                          E-field (V/m)
       Front (1)          0.30            614.0         307.0           -306.70
       Left (2)           0.32            614.0         307.0           -306.68
       Right (4)          0.25            614.0         307.0           -306.75
       Back (3)           0.22            614.0         307.0           -306.78
       Bottom             0.32            614.0         307.0           -306.68

         Electric Field (E-Field) strength at 20cm above the top surface from the EUT

       EUT location       Measured        Limit (V/m)   50%of Limit     Margin (V/m)
                          E-field (V/m)
       Top                0.37            614.0         307.0           -306.63




FCC ID: 2AP7Z-B66954804


Equipment List

 Equipment                Magnetic Field meter
 Registration No.               EW-2140
 Manufacturer               NARDASAFETY
 Model No.                      ELT400
 Calibration Date             Mar 28, 2018
 Calibration Due Date         Mar 28, 2019



 Equipment                Electric Field Sensor
 Registration No.               EW-1387
 Manufacturer                SCHAFFNER
 Model No.                      EMC20
 Calibration Date             Nov 6, 2017
 Calibration Due Date         May 6, 2019




FCC ID: 2AP7Z-B66954804



Document Created: 2019-05-23 09:51:01
Document Modified: 2019-05-23 09:51:01

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