RF exposure info

FCC ID: C3K1864

RF Exposure Info

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FCCID_4453295

"" Microsoft RF Exposure Evaluation Report For MODEL NO. 1864 FCC ID: C3K1864 Test Report No. S—176—FCC—SAR—1 Issue Date: September 9, 2019 FCC CFR47 Part 2.1093 Prepared by Microsoft EMC Laboratory 17760 NE 67th Ct, Redmond WA, 98052, U.S.A. 425—421—9799 sajose@microsoft.com *a IACCREDITEDI TESTING CERT #3472.01 Report V2.0

EM Microsoft 1 Record of Revisions Revision Date Section Page(s) Summary of Changes Author/Revised By: 1.0 09/09/2019 All All Version 1.0 2. Gra Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 2 of 10 Microsoft EMC Laboratory

EM Microsoft Table of Contents 1. R@COFQ Of R@VIBIONS.................ccllccsvccncemnenmmmemmeenmeenmeenmeenenmeenmeenmeenmeeneemememeenmenmeenmeenees 2 2 POUUGL D@SCTIDNION.............l.lcccscccccencnecmenmenmeenmeenmeenmeenmeemeememeemeemmeenmeenmeenmeenenmeenmeemeces 5 3 DBViHiONS fFOM SIANO@TOS .............scccecsecnnecennmenmmemeenmeenmennmnmennmennmennmennmnnnmnnnmnnmmnnmmnnmenmmenns 5 4 FACiIIItIQ$ @NU ACCI@UN@HNONS...............cclcccscncnnecmmenmenmenmeenmeememmeemmeemmnemeenmnenmnenmeenmeenemeens. 6 41. TSE FACIIMY.............ccccncmmenmenmmemmenmmeemenmeenenmeenmeenmemeemeemeemeemeeneeneeneenenmenmmenmens 6 4.2. ACGCTEUI@NIONS ..............cclcccscencememmeemmenmemmemeenmeenmeenmeemmemeemeemeemeemmeemmeemmeemmeenenmeennces 6 5 SAR TSb EXCIUSIOM ............scececneennnneenmnmmnnnnnmmnnnnnnnnnennnennnennenmnennennennennnnnnnnnnnnnnnnmnnmmenmenes 7 5.1 FCC SAR Test Exclusion Criteria............ .7 5.1.1 FCC SAR Test Exclusion Evaluation .. 5.1.2 Simultaneous Transmission Considerations . Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 3 of 10 Microsoft EMC Laboratory

== Microsoft Test Report Attestation Microsoft Corporation Model: 1864 FCC ID: C3K1864 Applicable Standards Specification Test Result FCC CFR47 Part 2.1093 Pass Microsoft EMC Laboratory attests that the product model identified in this report has been tested to and meets the requirements identified in the above standards. The test results in this report solely pertains to the specific sample tested, under the conditions and operating modes as provided by the customer. This report shall not be used to claim product certification, approval, or endorsement by A2LA or any agency of any Government. Reproduction, duplication or publication of extracts from this test report requires prior written approval of Microsoft EMC Laboratory. guo* Sray u22 Written/ Issued By: Zack Gray Reviewed By: Wei Sun SAR Test Lead SAR/Radio Test Engineer Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 4 of 10 Microsoft EMC Laboratory

EM Microsoft 2 Product Description Company Name: Microsoft Corporation Address: One Microsoft Way City, State, Zip: Redmond, WA 98052—6399 Customer Contact: NMike Boucher Functional Description of Portable Computing, VO accessory device with NFC charging the EUT: capability Model: 1864 FCC ID: C3K1864 Radio Description: NFC Charging @ 13.56 MHz Frequency Range of 13.56 MHz Operation: Antenna Type: Integral Coil EUT Classification: Part 15 Low Power Transmitter Equipment Design State: Production Equipment Condition: Good RF Exposure Conditions: Body Exposure 3 Deviations from Standards None. Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 5 of 10 Microsoft EMC Laboratory

EM Microsoft 4 Facilities and Accreditations 4.1 Test Facility All test facilities used to collect the test data are located at Microsoft EMC Laboratory, 17760 NE 67!" Ct, Redmond WA, 98052, USA 4.2 Accreditations The lab is established and follows procedures as outlined in IEC/ISO 17025 and AZLA accreditation requirements. A2LA Accredited Testing Certificate Number: 3472.01 Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 6 of 10 Microsoft EMC Laboratory

EM Microsoft 5 SAR Test Exclusion 5.1 FCC SAR Test Exclusion Criteria The full FCC standalone SAR test exclusion criteria from KDB 447498 DO1 are as follows. a) For 100 MHz to 6 GHz and fest separation distances < 50 mm, the 1—g and 10—g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune—up tolerance, mW) / (min. test separation distance, mm)] " [INf(GHz)] < 3.0 for 1—g SAR, and <7.5 for 10—g extremity SAR, where * f(GHz) is the RF channel transmit frequency in GHz * Power and distance are rounded to the nearest mW and mm before calculation * The result is rounded to one decimal place for comparison * The values 3.0 and 7.5 arereferred to as nuneric thresholds in step b) below The test exclusions are applicable only when the minimum test separation distance is = 50 mm, and for transmission frequencies between 100 MHz and 6 GHz. When the minimum fest separation distance is < 5 mm, a distance of 5 mm according to 4. 1 f) is applied to determine SAR test exclusion. b) For 100 MHz to 6 GHz and fest separation distances > 50 mm, the 1—g and 10—g SAR test exclusion thresholds are determined by the following (also illustrated in Appendix B) 1) {[Power allowed at nwneric threshold for 50 mm in step a)] + [(test separation distance — 50 mm)—(F(MHz)/150)]} mW for 100 MHz to 1500 MHz 2) {[Power allowed at nwneric threshold for 50 mm in step a)] + [(test separation distance — 50 mm)—10]} mW, for > 1500 MHz and < 6 GHz c) For frequencies below 100 MHz, the following may be considered for SAR test exclusion (also illustrated in Appendix C) 1) For test separation distances > 50 mm and < 200 mm, the powerthreshold at the corresponding test separation distance at 100 MHz in step b) is multiplied by [1 + log(100/F(MHz])] 2) For test separation distances < 50 mm, the power threshold determined by the equation in c) 1) for 50 mm and 100 MHz is multiplied by 14 3) SAR measurement procedures are not established below 100 MHz. Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 7 of 10 Microsoft EMC Laboratory

EM Microsoft 5.1.1 FCC SAR Test Exclusion Evaluation Since the transmitter frequency is 13.56 MHz to be used with a separation distance s 50mm, step c)2 is applicable. This calls for making the calculation in four parts: 1 Calculate the power allowed at the numeric threshold in step a) for 100 MHz and a 50mm separation distance. 3+50mm P (mW) < v0.1GHz P (mW) < 474.34 mW Calculate the test exclusion threshold for 100 MHz and a 50mm separation distance using step b)1 with the previous result from step a). 474.34 mW + (50mm — 5Omm) * (100 MHz / 150) = 474.34 mW Perform step c)1 on the result found from step b)1 for the 13.56 MHz frequency. 474.34 mW * [1 + log(100/13.56)] = 885.94 mW Perform step c)2 on the result found from step c)1. 0.5 * 885.94 mW = 443 mW The SAR test exclusion level for a 13.56 MHz transmitter used closer than 50mm from the body is thus 443 mW. The maximum powerdelivered to the transmit coil in the EUT is 330 mW. Thus, the EUT is excluded from routine SAR evaluation measurements since the SAR test exclusion criteria are met. Frequency Maximum Maximum Separation SAR Test Result (MHz) Output Output Distance Exclusion Power Power (mm) Power (dBm) (mW) Threshold SAR Testing 13.56 25.2 330 0 443 mW Excluded Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 8 of 10 Microsoft EMC Laboratory

EM Microsoft 5.1.2 Simultaneous Transmission Considerations The shortest separation distance between the EUT‘s NFC coil and any of the antennas in the host device is greater than 20cm due to the host—EUT operating configurations. In addition to showing standalone SAR test exclusion eligibility, SAR measurements were attempted. All measurements showed SAR levels at the measurement system‘s noise floor. In combination this information shows that the contribution of the NFC transmitter to the host‘s SAR levels would be negligible, and the EUT‘s NFC transmitter can thus be excluded from simultaneous transmission analysis. This was agreed on through KDB inquiry. Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 9 of 10 Microsoft EMC Laboratory

EM Microsoft End of Report Report#: S—176—FCC—SAR—1 Issued: 09/09/2019 Page 10 of 10 Microsoft EMC Laboratory


Document Created: 2019-10-02 17:33:41
Document Modified: 2019-10-02 17:33:41
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