RF Exposure

FCC ID: 2AOK9-MIDRIVEPB01

RF Exposure Info

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FCCID_4230806

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RKSA181204002-00A

FCC §1.1307& §1.1310 – RF EXPOSURE
Applicable Standard

FCC §1.1307 & 1.1310

According to the item 5.2 of KDB 680106 D01 RF Exposure Wireless Charging Apps v03: Inductive
wireless power transfer applications that meet all of the following requirements are excluded from
submitting an RF evaluation.

a) Power transfer frequency is less that 1 MHz.
b) Output power from each primary coil is less than or equal to 15 watts.
c) The transfer system includes only single primary and secondary coils. This includes charging systems that
may have multiple primary coils and clients that are able to detect and allow coupling only between
individual pairs of coils.
d) Client device is placed directly in contact with the transmitter.
e) Mobile exposure conditions only (portable exposure conditions are not covered by this exclusion).
f) The aggregate H-field strengths at 15 cm surrounding the device and 20 cm above the top surface from all
simultaneous transmitting coils are demonstrated to be less than 50% of the MPE limit.

Limits for Maximum Permissible Exposure (MPE)

(B) Limits for General Population/Uncontrolled Exposure
Frequency Range Electric Field Magnetic Field Power Density Averaging Time
(MHz) Strength (V/m) Strength (A/m) (mW/cm2) (minutes)
(A) Limits for Occupational/Controlled Exposure
0.3-3.0 614 1.63 *100 6
3.0-30 1842/f 4.89/f *900/f2 6
30-300 61.4 0.163 1.0 6
300-1,500 f/300 6
1,500-100,000 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

f = frequency in MHz; * = Plane-wave equivalent power density;

FCC Part 15C Page 9 of 21

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RKSA181204002-00A

Test Data
Environmental Conditions

Temperature: 24.2℃
Relative Humidity: 51 %
ATM Pressure: 101.2 kPa

The testing was performed by Stone Zhang on 2018-12-20.

H-Filed Strength

Frequency Position Position Position Position Position Limit Ratio of
Range A B C D E Test MPE
(kHz) (A/m) (A/m) (A/m) (A/m) (A/m) (A/m) Limit
110-148 0.178 0.196 0.213 0.155 0.437 1.63 26.81%

E-Filed Strength

Frequency Position Position Position Position Position Limit Ratio of
Range A B C D E Test MPE
(kHz) (V/m) (V/m) (V/m) (V/m) (V/m) (V/m) Limit
110-148 2.83 2.81 2.13 3.75 6.50 614 1.06%

Note:

1: According with KDB 680106 D01 RF Exposure Wireless Charging Apps v03, Emissions between 100 kHz to 300
kHz should be assessed versus the limits at 300 kHz in Table 1 of Section 1.1310: 614V/m and 1.63 A/m.

2: The distance for position A, B, C, D are 15cm, the distance for position E is 20cm.

FCC Part 15C Page 11 of 21

Document Created: 2019-04-08 19:28:56
Document Modified: 2019-04-08 19:28:56

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