FCC RF Exposure for WPT-2ADK3XO-9833

FCC ID: 2ADK3XO-9833

RF Exposure Info

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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 RF Exposure Evaluation Report 1. Product Information FCC ID: 2ADK3XO-9833 Product Name Bluetooth Speaker with Wireless Charging Powerbank Model Number XO-9833 DC 3.7V by battery(8000mAh) Power Supply Recharged by DC 5V/0.5A Modulation Type Continuous Wave Frequency Range 110.0 - 205 KHz Operation Frequency 168.0 KHz Maximum Rated Power of WPT 5W Antenna Type Coil Antenna Hardware version 9833-BK3266-V1.1 Software version V1.0 Accessories iPhone X Exposure category General population/uncontrolled environment EUT Type Production Unit Device Type Mobile Device 2. Evaluation Method Per KDB 680106 D01 Section 3. RF Exposure Requirements; 1) Consumer wireless power transfer devices approved under Part 18 in some cases have to demonstrate compliance with RF exposure requirements. The potential for exposure must be assessed according to the operating configurations of the wireless system and the exposure conditions of users and bystanders. RF exposure must be evaluated with the client device(s) being charged by the primary at maximum output power. The RF exposure requirements must be determined in conjunction with the device operating characteristics, according to the mobile and portable exposure requirements in Section 2.1091 and Section 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 1.1307 (c) and (d) of the FCC rules. 2) Based on the design and implementation of the power transfer application, it must be clearly identified if mobile or portable RF exposure conditions apply. Devices that are installed to provide separation of at least 20 cm from users and bystanders may qualify for mobile exposure conditions. For some conditions where users and bystanders may be exposed at closer than 20 cm, section 2.1091(d) (4) of the rules may apply. 3) 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. A KDB inquiry is required to determine the applicable exposure limits below 100 kHz. 4) Portable exposure conditions from 100 kHz to 6 GHz are determined with respect to SAR requirements. ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 1 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 Existing SAR systems and test procedures are generally intended for measurements above 100 MHz. While numerical modeling can be an alternative, the constraints of substantial computational resources at low frequencies could introduce further limitations. Under these circumstances, including operations below 100 kHz, the Commission may consider a combination of analytical analysis, field strength, radiated and conducted power measurements, in conjunction with some limited numerical modeling to assess compliance. 5) Depending on the operating frequency, existing SAR and MPE measurement procedures may be adapted to evaluate wireless power transfer devices for compliance with respect to mobile or portable exposure conditions. If the grantee or its test lab have any questions regarding RF exposure evaluation they should contact the FCC Laboratory with sufficient system operating configuration details to determine if RF exposure evaluation is necessary and, if required, how to apply specific test procedures. Below 100 MHz, when SAR testing is required and the device is operating at close proximity to persons, information on device design, implementation, operating configurations, exposure conditions of users and bystanders are needed to determine the evaluation and testing requirements. In addition, the influence of nearby objects may also need consideration according to the wireless power transfer system implementation; for example, the effects of placing the device, its coils or radiating elements on or near metallic surfaces 6) According to April 2018 TCB Workshop, No need to report E-field measurements. Only H-field required. 3. Evaluation Limit 3.1 Refer Evaluation Method ANSI C95.1–1999: IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. FCC KDB publication 680106 D01 RF Exposure Wireless Charging Apps v03: RF Exposure Considerations for Low Power Consumer Wireless Power Transfer Applications FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits. FCC CFR 47 part2 2.1091: Radiofrequency radiation exposure evaluation: mobile devices FCC CFR 47 part 18.107:Indusial, Scientific, and Medical Equipment 3.2 Limit Limits for Maximum Permissible Exposure (MPE)/Controlled Exposure Frequency Electric Field Magnetic Field Power Density Averaging Time Range(MHz) Strength(V/m) Strength(A/m) (mW/cm²) (minute) Limits for Occupational/Controlled Exposure 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 6 300-1,500 / / f/300 6 1,500-100,000 / / 5 6 ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 2 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 Limits for Maximum Permissible Exposure (MPE)/Uncontrolled Exposure Frequency Electric Field Magnetic Field Power Density Averaging Time Range(MHz) Strength(V/m) Strength(A/m) (mW/cm²) (minute) 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 30 300-1,500 / / f/1500 30 1,500-100,000 / / 1.0 30 F=frequency in MHz *=Plane-wave equivalent power density According to FCC KDB 680106 D01 Section 3. RF Exposure Requirements clause 3 the Emission-Limits in the frequency range from 100 KHz to 300 KHz should be assessed versus the limits at 300 KHz in Table 1 of CFR 47 – Section1.310 as following (measured distance shall be 15cm from the center of the probe to the edge of the device): E-Field */* B-Field Frequency V/m A/m uT 0.3 MHz – 3.0 MHz 614 1.613 2.0 3.0 MHz – 30 MHz 824/f (=27.530MHz) 2.19/f (=0.07330MHz) -- A KDB inquire was required to determine/confirm the applicable limits below 100 KHz. 4. Test Block Diagram of Picture of Two Modes Picture of Two Models Supine mode Pad mode ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 3 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 5. Test Setup Diagram For mobile RF exposure condition, due to installation limitations no tests from the underside of the charging device are required. 6. Test Equipment Equipment Manufacturer Model Serial no. Calibrated date Calibrated Due Exposure Level Tester Narda ELT-400 N-0713 2019-06-17 2020-06-16 B-Field Probe Narda ELT-400 M-1154 2019-06-17 2020-06-16 7. Measurement Procedure a) The RF exposure test was performed on 360 degree turn table in anechoic chamber. b) The measurement probe was placed at test distance (15cm and 20cm) which is between the edge of the charger and the geometric center of probe. c) The turn table was rotated 360d degree to search of highest strength. d) The highest emission level was recorded and compared with limit as soon as measurement of each points (A, B, C, D, E) were completed. e) The EUT were measured according to the dictates of KDB 680106D01v03. ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 4 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 8. Equipment Approval Considerations The EUT does comply with item 5.2 of KDB 680106 D01v03 as follows table; Requirements of KDB 680106 D01 Yes / No Description The device operate in the frequency range Power transfer frequency is less than 1 MHz Yes 110.0 KHz - 205 KHz Output power from each primary coil is less The maximum output power of the primary Yes than 15 watts coil is 5W. The transfer system includes only single primary and secondary coils. This includes charging systems that may have multiple Yes The transfer system includes only single coil. primary coils and clients that are able to detect and allow coupling only between individual pairs of coils. Client device is placed directly in contact with Client device is placed directly in contact Yes the transmitter. with the transmitter. Mobile exposure conditions only (portable exposure conditions are not covered by this Yes Mobile exposure conditions only exclusion). The aggregate H-field strengths at 15 cm The EUT H-field strengths at 15 cm surrounding the device and 20 cm above the surrounding the device and 20 cm above the top surface from all simultaneous transmitting Yes top surface from all simultaneous coils are demonstrated to be less than 50% of transmitting coils are demonstrated to be the MPE limit. less than 50% of the MPE limit. In all other cases, unless excluded above, an RF exposure evaluation report must be reviewed and accepted through a KDB or PBA inquiry to enable authorization of the equipment. When evaluation is required to show compliance; for example, using field strength, power density, SAR measurements or computational modeling etc., the specific authorization requirements will be determined based on the results of the RF exposure evaluation ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 5 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 9. H field Strength Test Modes TM1 AC/DC Adapter (5V/2A) + EUT + Mobile Phone (Pad mode) (Battery Status: <1%) Pre-tested TM2 AC/DC Adapter (5V/2A) + EUT + Mobile Phone (Pad mode) (Battery Status: <50%) Pre-tested TM3 AC/DC Adapter (5V/2A) + EUT + Mobile Phone (Pad mode) (Battery Status: 100%) Pre-tested TM4 PC Charger + EUT + Mobile Phone (Pad mode) (Battery Status: <1%) Pre-tested TM5 PC Charger + EUT + Mobile Phone (Pad mode) (Battery Status: <50%) Pre-tested TM6 PC Charger + EUT + Mobile Phone (Pad mode) (Battery Status: 100%) Pre-tested Note: All test modes were pre-tested, but we only recorded the worst case in this report. E-Field Strength at 15 cm from the edges surrounding the EUT and 15cm from the top surface of the EUT Measured E-Field Strength Values (V/m) FCC FCC E-Field Charging Frequency E-Field Test Test Test Test Test Strength Battery Range Strength Position Position Position Position Position 50% Limits Level (MHz) Limits A B C D E (V/m) (V/m) 1% 0.1650 5.447 5.558 5.914 5.767 6.125 307.0 614.0 50% 0.1650 5.369 5.632 6.028 5.896 6.238 307.0 614.0 99% 0.1650 5.284 5.774 6.115 5.884 6.225 307.0 614.0 H-Field Strength at 15 cm from the edges surrounding the EUT and 15cm from the top surface of the EUT Measured H-Field Strength Values (A/m) FCC H-Field FCC H-Field Charging Frequency Test Strength Strength Battery Range Test Test Test Test Position 50% Limits Limits Level (MHz) Position A Position B Position C Position E D (A/m) (A/m) 1% 0.1680 0.145 0.187 0.250 0.217 0.275 0.815 1.63 50% 0.1680 0.151 0.212 0.205 0.239 0.258 0.815 1.63 99% 0.1680 0.157 0.206 0.238 0.238 0.263 0.815 1.63 H-Field Strength at 20cm from the top surface of the EUT Charging Measured H-Field Strength FCC H-Field FCC H-Field Frequency Range Battery Values (A/m) Strength 50% Strength Limits (MHz) Level Test Position E Limits (A/m) (A/m) 1% 0.1680 0.170 0.815 1.63 50% 0.1680 0.164 0.815 1.63 99% 0.1680 0.166 0.815 1.63 ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 6 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 WPT RF Exposure_Mobile 0.9 0.8 0.7 0.6 Test Position A_15cm H-Field (A/m) Test Position B_15cm 0.5 Test Position C_15cm 0.4 Test Position D_15cm 0.3 Test Position E_15cm 0.2 50% Limit 0.1 Test Position E_20cm 0 1.00% 50.00% 99.00% Charging Battery Level 10. Test Setup Photos 10.1 Pad mode 20cm Test Position E - Exposure photo from top surface (20cm) (TM1) ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 7 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 15cm Test Position E - Exposure photo from top surface (15cm) (TM1) 15cm Test Position A - Exposure photo from side edge surface-Rear (TM1) ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 8 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 15cm Test Position B - Exposure photo from side edge surface-Left (TM1) 15cm Test Position C - Exposure photo from side edge surface-Front (TM1) ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 9 of 10

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2ADK3XO-9833 15cm Test Position D - Exposure photo from side edge surface-Right (TM1) 11. Conclusion A minimum safety distance of at 15 cm surrounding the device and 20 cm above the top surface of the device is required when the device is charging a smart phone. The detected emissions with a distance of 15 cm surrounding the device and 20 cm above the top surface of the device are below the limitations according to FCC KDB 680106 D01 Section 3. RF Exposure Requirement Clause 3. Revision History Revision Issue Date Revisions Revised By 000 March 05, 2019 Initial Issue Gavin Liang .........................END OF REPORT......................... ___________________________________________________________________________ This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd. Page 10 of 10


Document Created: 2019-09-12 13:56:49
Document Modified: 2019-09-12 13:56:49
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