S-TR136-FCCSAR-3

FCC ID: C3K1836

RF Exposure Info

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FCCID_3881473

SAR TEST REPORT for MODEL NO. 1836 FCC ID: C3K1836 Test Report No. S-TR136-FCCSAR-3 Issue Date: Jun 07, 2018 FCC CFR 47 PART 2.1093 IEEE 1528-2013 Prepared by Microsoft EMC Laboratory 17760 NE 67th Ct, Redmond WA, 98052, U.S.A. 425-421-9799 sajose@microsoft.com TESTING CERT #3472.01 Report V4.2

Model: 1836 FCC ID: C3K1836 1 Record of Revisions Revision Date Section Page(s) Summary of Changes Author/Revised By: 1.0 05/23/2018 All All First Version Wei Sun Deleted reference to MIMO 2.0 05/30/2018 6 9 Wei Sun mode. 3.0 06/07/2018 6.4 10 Corrected details for FW and Wei Sun driver details of the test samples. Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 2 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 Test Report Attestation Microsoft Corporation Model: 1836 Applicable Standards Specification Test Result FCC CFR 47 PART 2.1093 Pass IEEE 1528-2013 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 is prohibited and requires prior written approval of Microsoft EMC Laboratory. This test report replaces the previously issued report #S-TR136-FCCSAR-2 issued by Microsoft EMC Labs on 05/30/2018. Written By: Wei Sun Reviewed/ Issued By: Sajay Jose SAR Test Engineer EMC/RF Compliance Lab Manager Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 3 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 Table of Contents 1 Record of Revisions ............................................................................................................... 2 2 Deviations from Standard ...................................................................................................... 6 3 Facilities and Accreditation .................................................................................................... 6 3.1 TEST FACILITY .............................................................................................................. 6 3.2 ACCREDITATIONS ........................................................................................................ 6 3.3 Test Equipment .............................................................................................................. 6 4 Highest Reported SAR Values .............................................................................................. 7 4.1 SAR Limits ...................................................................................................................... 7 5 Test Equipment List ............................................................................................................... 8 6 Product Description ............................................................................................................... 9 6.1 TEST CONFIGURATIONS ........................................................................................... 10 6.2 ENVIRONMENTAL CONDITIONS ............................................................................... 10 6.3 EQUIPMENT MODIFICATIONS ................................................................................... 10 6.4 EQUIPMENT UNDER TEST ........................................................................................ 10 6.5 Supported Air Interfaces and Transmission Configurations ......................................... 10 6.5.1 Transmission Configurations ................................................................................. 10 7 Test Methodology ................................................................................................................ 11 8 Conducted RF Average Output Power Measurements ....................................................... 12 8.1 Bluetooth Conducted Output Power Measurements .................................................... 12 8.2 WLAN Power Measurement Requirements .................................................................. 13 8.3 Initial Test Configuration for OFDM Configurations ...................................................... 13 8.4 WLAN 2.4 GHz Conducted Output Power Measurements ........................................... 14 8.5 WLAN 5 GHz Conducted Output Power Measurements .............................................. 14 8.5.1 5.2 GHz Conducted Measurements (U-NII-1) ....................................................... 14 8.5.2 5.3 GHz Conducted Measurements (U-NII-2A) ..................................................... 14 8.5.3 5.6 GHz Conducted Measurements (U-NII-2C) .................................................... 15 8.5.4 5.8 GHz Conducted Measurements (U-NII-3) ....................................................... 15 9 Test Configurations .............................................................................................................. 16 9.1 Evaluation of Required Test Configurations ................................................................. 17 9.1.1 SAR Test Exclusion Evaluation for antenna-user separation distances less than 50mm 17 9.1.2 SAR Test Exclusion Evaluation for antenna-user separation distances greater than 50mm 18 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 4 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 9.2 Test Positions ............................................................................................................... 18 10 SAR Test Procedures ...................................................................................................... 19 11 SAR Test Results ............................................................................................................. 21 11.1 General SAR Testing Notes ......................................................................................... 21 11.2 WLAN 5 GHz SAR Testing Notes ................................................................................ 22 11.2.1 WLAN 5.2 GHz SAR Test Results ........................................................................ 22 11.2.2 WLAN 5.3 GH Main Antenna SAR Test Results ................................................... 22 11.2.3 WLAN 5.3 GHz Diversity Antenna SAR Test Results ........................................... 22 11.2.4 WLAN 5.6 GHz Main Antenna SAR Test Results ................................................. 23 11.2.5 WLAN 5.6 GHz Diversity Antenna SAR Test Results ........................................... 23 11.2.6 WLAN 5.8 GHz Main Antenna SAR Test Results ................................................. 23 11.2.7 WLAN 5.8 GHz Diversity Antenna SAR Test Results ........................................... 23 12 SAR System Verification .................................................................................................. 24 12.1 SAR System Verification Results ................................................................................. 25 13 Tissue-Simulating Liquid Verification ............................................................................... 26 13.1 Tissue-Simulating Liquid Ingredients and Maintenance ............................................... 27 13.2 Tissue-Simulating Liquid Measurements ...................................................................... 28 14 System Specification ........................................................................................................ 29 14.1 SPEAG DASY5 SYSTEM ............................................................................................. 29 15 Measurement Uncertainty ................................................................................................ 30 16 Appendices ...................................................................................................................... 31 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 5 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 2 Deviations from Standard None. 3 Facilities and Accreditation 3.1 TEST FACILITY All test facilities used to collect the test data are located at Microsoft EMC Laboratory: 17760 NE 67th Ct, Redmond, WA, 98052, USA. 3.2 ACCREDITATIONS The lab is established and follows procedures as outlined in IEC/ISO 17025 and A2LA accreditation requirements. A2LA Accredited Testing Certificate Number: 3472.01 Expiration Date: Aug 31, 2019 3.3 Test Equipment The site and related equipment are constructed in conformance with the requirements of IEEE 1528-2013 and other equivalent applicable standards. The calibrations of the measuring instruments, including any accessories that may affect such calibration, are checked frequently to assure their accuracy. Adjustments are made and correction factors are applied in accordance with instructions contained in the user manual for the measuring equipment. Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 6 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 4 Highest Reported SAR Values Exposure Equipment Mode of 1-g Reported Condition Test Position Class Operation SAR (W/kg) Body NII 802.11a Bottom 0.457 Exposure Reported SAR Values are obtained by scaling the measured SAR values up to the maximum allowable output power for each configuration using the following equation: 𝑆𝐴𝑅 π‘€πΈπ΄π‘†π‘ˆπ‘…πΈπ· ∗ 10 where SAR = Reported SAR (W/kg) MEASURED = Measured SAR (W/kg) PMAX = Maximum Conducted Average Output Power (dBm) P = Measured Conducted Average Output Power (dBm) 4.1 SAR Limits The following are the relevant SAR limits for FCC and IC based on the recommendations of ANSI C95.1-1992: Exposure Condition Limit (W/kg) Localized Body SAR 1.6 (1-g cube) Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 7 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 5 Test Equipment List Cal. Manufacturer Description Model SN Identifier Cal. Due Cycle Signal Agilent N5181A MY50144778 SAR-051 11/29/2018 1 yr Generator Power Amplifier + PRANA UX15 1305-1354 SAR-046 N/A N/A Directional Coupler Agilent Power Meter 1914A MY50901710 SAR-052 12/4/2018 1 yr Agilent Power Sensor 9304A MY53040024 SAR-064 12/5/2018 1 yr Agilent Power Sensor 9304A MY53040018 SAR-063 12/5/2018 1 yr Network Agilent E5071C MY46316847 SAR-002 12/10/2018 1 yr Analyzer Dielectric Agilent 85070E MY44300736 SAR-003 N/A 1 yr Probe Kit DASY Data SPEAG Acquisition DAE4 1445 SAR-109 11/28/2018 1 yr Electronics Dosimetric E- SPEAG EX3DV4 3999 SAR-108 12/06/2018 1 yr Field Probe SAR Validation SPEAG Dipole, 2450 D2450V2 916 SAR-023 04/11/2019 1 yr MHz SAR Validation SPEAG D5GHzV2 1158 SAR-015 04/17/2019 1 yr Dipole, 5 GHz Elliptical SPEAG ELI V5.0 1217 N/A N/A N/A Phantom Thomas Thermometer 1230N27 150530613 SAR-113 8/4/2018 1 yr Scientific MadgeTech THP Monitor PRHTemp2000 P25366 SAR-091 8/10/2018 1 yr Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 8 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 6 Product Description Company Name: Microsoft Corporation Address: One Microsoft Way City, State, Zip: Redmond, WA 98052 Customer Contact: Pamela Galvan Functional Description of the EUT: Microsoft Wireless Input Device RF Exposure Conditions: Body Exposure Model: 1836 FCC ID: C3K1836 IC ID: 3048A-1836 Radio Descriptions: WLAN 2.4 GHz: 802.11g, 802.11n 20 MHz BW’s WLAN 5 GHz: 802.11a, 802.11n 20MHz BW’s Bluetooth™ (Basic and Enhanced Data Rates) Frequency Range of 2412 – 2462 MHz Operation: WLAN Radio: 5180 – 5825 MHz BT: 2402 – 2480 MHz Modulations: WLAN: CCK, BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM 𝝅 Bluetooth: GFSK, DQPSK, and 8 DPSK πŸ’ Antenna Peak Gains Radio Band Main Diversity (dBi): WLAN/BT 2400 – 2483.5 MHz 4.7 - WLAN 5150 – 5250 MHz 6.2 6.7 5250 – 5350 MHz 6.2 6.0 5470 – 5725 MHz 5.9 6.1 5725 – 5850 MHz 5.6 6.4 Equipment Design State: Prototype/Production Equivalent Equipment Condition: Good Dates of Testing: 05/04/2018 – 05/08/2018 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 9 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 6.1 TEST CONFIGURATIONS For Bluetooth, measurements were performed with customer-provided test software “Combo Tool Ver 2.1509.00, Build Date: 2/26/2015” to program the EUT in continuous transmit mode. For WLAN, measurements were performed with customer-provided test software “Indium QA Tool” (Ver 1.19) to program the EUT in continuous transmit mode. 6.2 ENVIRONMENTAL CONDITIONS Ambient air temperature of the test site was within the range of 18 ⁰C to 25 ⁰C. Testing conditions were within tolerance and any deviations required from the EUT are reported. 6.3 EQUIPMENT MODIFICATIONS No modifications were made during testing. 6.4 EQUIPMENT UNDER TEST Model Serial Number Internal Lab ID: Number 1836 02560002607814 S-136-04262018-01 1836 02560002237814 S-136-04262018-02 Radio FW: 4.5.213.0 Radio Driver Version: FTDI Driver v2.12.28.0 6.5 Supported Air Interfaces and Transmission Configurations The EUT has three antennas which support the following air interfaces and transmission configurations. The antennas are labeled as Main Antenna and Diversity Antenna for 802.11 WLAN 5GHz, and the third is labeled as Primary Antenna for WLAN 2.4GHz and BT. BW (MHz) Band Air Interface 20 40 80 WLAN 802.11g X 2.4 GH 802.11n X WLAN 802.11a X 5 GHz 802.11n X 2.4 GHz Bluetooth NA 6.5.1 Transmission Configurations Main Antenna Diversity Antenna Primary Antenna WLAN 5 GHz WLAN 5 GHz WLAN 2.4 GHz Bluetooth Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 10 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 7 Test Methodology Test setup and procedure are performed according to IEEE 1528-2013 Recommended Practice for Determining the Peak Spatial-Average Specific Absorption Rate (SAR) in the Human Head from Wireless Communication Devices: Measurement Techniques. In addition, the following publications were used as guidance- For FCC SAR testing and reporting according to FCC standards the following KDBs were adhered to: ο‚· 447498 D01 General RF Exposure Guidance v06 ο‚· 865664 D01 SAR Measurement 100 MHz to 6 GHz v01r04 ο‚· 865664 D02 RF Exposure Reporting v01r02 ο‚· 248227 D01 802.11Wi-Fi SAR v02r02 ο‚· 616217 D04 SAR for laptops and tablets v01r02 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 11 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 8 Conducted RF Average Output Power Measurements Bluetooth and WLAN output power measurements are made with the DUT connected to the power sensor of a broadband power meter. 8.1 Bluetooth Conducted Output Power Measurements Maximum Conducted Average Output Power (dBm) Frequency Mode Channel Primary Antenna (MHz) Measured Max 0 2402 -2.83 5 1DH1 39 2441 -1.79 5 78 2480 -1.51 5 0 2402 3.77 5 1DH3 39 2441 4.78 5 78 2480 5 5 0 2402 3.25 5 1DH5 39 2441 4.24 5 78 2480 4.5 5 0 2402 -5.32 5 2DH1 39 2441 -4.31 5 78 2480 -4.03 5 0 2402 0.56 5 2DH3 39 2441 1.57 5 78 2480 1.85 5 0 2402 -0.09 5 2DH5 39 2441 0.94 5 78 2480 1.21 5 0 2402 -5.3 5 3DH1 39 2441 -4.29 5 78 2480 -4 5 0 2402 -0.55 5 3DH3 39 2441 1.55 5 78 2480 1.84 5 0 2402 -0.08 5 3DH5 39 2441 0.93 5 78 2480 1.22 5 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 12 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 8.2 WLAN Power Measurement Requirements According to KDB 248227 v02r02 Section 4, maximum output power must be measured according to the default power measurement procedures below. When SAR measurement is required, power measurement is also required to confirm output power settings and to determine reported SAR. Additional power measurements may be necessary to determine SAR test reduction for test channels in a transmission mode. If the required power measurement is not included in the default configuration, it is typically measured immediately before and/or after the SAR measurement. Otherwise, when power measurement is not required for a transmission mode, the maximum output power and tune-up tolerance specified for production units can generally be used to determine SAR test exclusion and reduction. The default power measurement procedures are: 1) Power must be measured at each transmit antenna port according to the DSSS and OFDM transmission configuration in each standalone and aggregated frequency band. 2) Power measurement is required for the transmission mode configuration with the highest maximum output power specified for production units. a) When the same higher maximum output power specification applies to multiple transmission modes, the largest channel bandwidth configuration with the lowest order modulation and lowest data rate is measured. b) When the same highest maximum output power is specified for multiple largest channel bandwidth configurations with the same lowest order modulation or lowest order modulation and lowest data rate, power measurement is required for all equivalent 802.11 configurations with the same maximum output power. 3) For each transmission mode configuration, power must be measured for the highest and lowest channels; and at the mid-band channel(s) when there are at least 3 channels. For configurations with multiple mid-band channels, due to an even number of channels, both channels should be measured. 8.3 Initial Test Configuration for OFDM Configurations *The Initial Test Configuration was chosen according to KDB 248227 v02r02 Section 5.3 from the mode with the highest maximum output power including tune-up tolerances, the highest channel bandwidth among those modes, the lowest order modulation, and the lowest data rate. The channel with the highest output power in that mode is chosen as the initial test channel. If multiple test channels have the same measured maximum output power, the channel chosen for SAR measurement is chosen by the following (applicable to subsequent test configuration as well). 1) The channel closest to mid-band frequency is selected for SAR measurement. 2) For channels with equal separation from mid-band frequency, for example, high and low channels or two mid-band channels, the higher frequency (number) channel is selected for SAR measurement. Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 13 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 8.4 WLAN 2.4 GHz Conducted Output Power Measurements Maximum Conducted Average Output Power (dBm) Frequency Mode Channel Primary Antenna (MHz) Measured Max 1 2412 5.57 6.5 802.11g 6 2437 5.45 6.5 6Mbps 11 2462 5.8 6.5 802.11n 1 2412 5.16 6.5 HT20 6 2437 5.02 6.5 MCS0 11 2462 5.44 6.5 8.5 WLAN 5 GHz Conducted Output Power Measurements 8.5.1 5.2 GHz Conducted Measurements (U-NII-1) Maximum Conducted Average Output Power (dBm) Frequency Mode Channel Main Antenna Diversity Antenna (MHz) Measured Max Measured Max 36 5180 8.82 9.5 9.04 9.5 802.11a 40 5200 8.7 9.5 8.91 9.5 6Mbps 44 5220 8.58 9.5 8.87 9.5 48 5240 8.41 9.5 8.67 9.5 36 5180 8.25 9.5 8.58 9.5 802.11n 40 5200 8.14 9.5 8.47 9.5 HT20 44 5220 8.13 9.5 8.29 9.5 MCS0 48 5240 8 9.5 8.26 9.5 8.5.2 5.3 GHz Conducted Measurements (U-NII-2A) Maximum Conducted Average Output Power (dBm) Frequency Mode Channel Main Antenna Diversity Antenna (MHz) Measured Max Measured Max 52 5260 8.02 9.5 8.32 9.5 802.11a 56 5280 7.9 9.5 8.22 9.5 6Mbps 60 5300 7.74 9.5 8.07 9.5 64 5320 7.71 9.5 8.07 9.5 52 5260 7.45 9.5 7.76 9.5 802.11n 56 5280 7.38 9.5 7.66 9.5 HT20 60 5300 7.39 9.5 7.7 9.5 MCS0 64 5320 7.25 9.5 7.55 9.5 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 14 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 8.5.3 5.6 GHz Conducted Measurements (U-NII-2C) Maximum Conducted Average Output Power (dBm) Frequency Mode Channel Main Antenna Diversity Antenna (MHz) Measured Max Measured Max 100 5500 8.52 9.5 8.71 9.5 104 5520 8.42 9.5 8.58 9.5 108 5540 8.27 9.5 8.53 9.5 112 5560 8.12 9.5 8.46 9.5 116 5580 8.03 9.5 8.51 9.5 802.11a 120 5600 7.03 9.5 8.16 9.5 6Mbps 124 5620 7.77 9.5 8.11 9.5 128 5640 8.84 9.5 8.92 9.5 132 5660 8.39 9.5 8.8 9.5 136 5680 8.14 9.5 8.65 9.5 140 5700 7.84 9.5 8.4 9.5 100 5500 8.04 9.5 8.2 9.5 104 5520 7.95 9.5 8.19 9.5 108 5540 7.8 9.5 8.15 9.5 112 5560 7.73 9.5 8.08 9.5 802.11n 116 5580 7.62 9.5 7.98 9.5 HT20 120 5600 7.51 9.5 7.77 9.5 MCS0 124 5620 7.57 9.5 7.73 9.5 128 5640 7.97 9.5 8.39 9.5 132 5660 7.83 9.5 8.26 9.5 136 5680 7.77 9.5 8.28 9.5 140 5700 7.54 9.5 7.83 9.5 8.5.4 5.8 GHz Conducted Measurements (U-NII-3) Maximum Conducted Average Output Power (dBm) Frequency Mode Channel Main Antenna Diversity Antenna (MHz) Measured Max Measured Max 149 5745 8.12 9.5 8.83 9.5 153 5765 8.38 9.5 8.79 9.5 802.11a 157 5785 8.88 9.5 8.74 9.5 6Mbps 161 5805 7.57 9.5 7.8 9.5 165 5825 8.1 9.5 8.36 9.5 149 5745 8.05 9.5 8.43 9.5 802.11n 153 5765 8 9.5 8.28 9.5 HT20 157 5785 7.88 9.5 8.23 9.5 MCS0 161 5805 7.5 9.5 7.59 9.5 165 5825 7.77 9.5 7.88 9.5 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 15 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 9 Test Configurations The standalone SAR test exclusion equations (KDB 447498 D01 4.3.1) are used to determine which device edges and faces require testing for a given antenna and air interface technology. From KDB 616217 D04 v01r02 (SAR for laptop and tablets) section 4.3, the SAR test exclusion threshold from KDB 447498 can be applied to determine SAR test exclusion for adjacent edge configurations. The closest distance from the antenna to an adjacent edge is used to determine if SAR testing is required for the adjacent edges. 1) For antenna to edge separation distances ≤ 50mm, the 1-g SAR test exclusion threshold can be determined by evaluating whether the following is true: π‘ƒπ‘šπ‘Žπ‘₯ ∗ 𝑓 3.0 𝑑 ο‚· Pmax = maximum possible average conducted power of transmitter, including tolerances, rounded to the nearest mW. ο‚· d = closest intended separation distance between transmitting antenna and edge / face of device (mm) (5mm at the least) ο‚· f = frequency of the transmitter for that power level in GHz 2) For antenna to edge separation distances > 50mm, the SAR test exclusion threshold is determined according to the following: a) [Power allowed at numeric threshold for 50 mm in step 1) + (test separation distance - 50 mm)ꞏ( f(MHz)/150)] mW, at 100 MHz to 1500 MHz b) [Power allowed at numeric threshold for 50 mm in step 1) + (test separation distance - 50 mm)ꞏ10] mW at > 1500 MHz and ≤ 6 GHz Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 16 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 9.1 Evaluation of Required Test Configurations The following table shows the maximum frequency of each transmitter in GHz and the maximum output power levels including tolerances rounded to the nearest mW: Parameters used Air Interface to Evaluate SAR WLAN 2.4 GHz WLAN 5 GHz BT Test Exclusion Max Freq. (GHz) 2.462 5.825 2.48 Max Power (mW) 4.47 8.91 3.16 9.1.1 SAR Test Exclusion Evaluation for antenna-user separation distances less than 50mm SAR evaluation is not required when the values below are ≤ 3.0 (numeric threshold). These values are calculated from each frequency (GHz), output power (mW), and antenna-user separation distance less than 50mm. Standalone SAR WLAN Main Antenna WLAN Diversity Antenna WLAN/BT Primary Antenna Test Exclusion Calculated Calculated Separation Separation Separation Calculated Value Value Value Device Side Distance Distance Distance (mm) WLAN 5 (mm) WLAN 5 (mm) WLAN BT GHz GHz 2.4 GHz Top Face 9.8 0.72 9.8 2.19 9.8 0.72 0.51 Bottom Face 6 3.58 6 3.58 6 1.17 0.83 Left Edge > 50 - > 50 - 3.5 1.4 1.00 Bottom Edge > 50 - 26 0.83 33 0.21 0.15 Right Edge > 50 - > 50 - > 50 - - Top Edge > 50 - > 50 - > 50 - - See attachments for antenna locations diagram. SAR Testing Performed SAR Testing Not Required Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 17 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 9.1.2 SAR Test Exclusion Evaluation for antenna-user separation distances greater than 50mm The SAR exclusion thresholds calculated from each frequency (GHz) and antenna-user separation distance greater than 50mm are shown below. SAR testing is not required for the given edge / face and frequency combination when the maximum output power is less than the exclusion threshold shown here. Standalone SAR WLAN Main Antenna WLAN Diversity Antenna WLAN/BT Primary Antenna Test Exclusion Exclusion Exclusion Exclusion Separation Threshold Separation Threshold Separation Threshold Device Side Distance (mW) Distance (mW) Distance (mW) (mm) WLAN 5 (mm) WLAN 5 (mm) WLAN BT GHz GHz 2.4 GHz Top Edge 60 162 105 612 84 436 435 Left Edge 79 352 79 352 < 50 - - Bottom Edge < 50 - 70 262 < 50 - - Right Edge 207 1632 207 1632 284 2436 2435 See attachments for antenna locations diagram. SAR Testing Performed SAR Testing Not Required 9.2 Test Positions See previous section for justification of test positions for this configuration. Test Setup Photo Exposure Condition Phantom Used DUT Test Position (See Appendix) Flat Section (SAM, Body Bottom 0mm Photo 1 ELI, or Triple-Flat) Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 18 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 10 SAR Test Procedures The SAR Evaluation was performed in the following steps: o Power Reference Measurement. The Power Measurement and Power Drift Measurements are for monitoring the power drift of the device under test. The minimum distance of probe sensors to surface determines the closest measurement point to phantom surface. The minimum distance of probe sensors to surface is set to 2mm for the EX3DV4 probe as recommended by SPEAG. The Power Reference Measurement is taken at a point close to the antenna whose output is being measured in order to maximize SNR, thus minimizing drift error. o Area Scan The Area Scan is used as a fast scan in two dimensions to find the areas of high field values (or hot spots), before doing a fine measurement around the hotspot. The sophisticated interpolation routines implemented in DASY5 software can find the maximum locations even in relatively coarse grids. When an Area Scan has measured all reachable points, it computes the field maxima found and lists all maxima found in the scan area within a certain range of the global maximum. A 2 dB range is required by IEEE STD 1528. Zoom scans need only be performed on all secondary maxima within this range when the absolute maximum found is under 2 dB less than the SAR limit in question (i.e., less than 1 W/kg for the 1.6 W/kg SAR limit). Otherwise, the zoom scan is only performed at the highest maxima found in the area scan. The following x-y grid spacings for the given transmitter frequency ranges are used for area scans in accordance with FCC KDB 865664 D01 SAR Measurement 100 MHz to 6 GHz: 700 MHz – 2 GHz: ≤ 15 mm 2 GHz – 4 GHz: ≤ 12 mm 4 GHz – 6 GHz: ≤ 10 mm o Zoom Scan Zoom Scans are used to assess the peak spatial SAR values within a cubic averaging volume containing 1g or 10g of simulated tissue. When the measurement is done, the Zoom Scan evaluates the averaged SAR for 1g and 10g and displays these values next to the job’s label. The sides of the zoom scan cube should be parallel to the edges of the EUT when possible. The dimensions of a Zoom Scan and spacing between measurement points vary by frequency according to FCC KDB 865664 D01 SAR Measurement 100 MHz to 6 GHz, shown in Table 2 below: Table 2: Zoom Scan Dimensions Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 19 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 Transmitter Cube x-y coordinate z coordinate Frequency Range Dimensions spatial resolution spatial resolution 700 MHz – 2 GHz ≥ 30 mm ≤ 8 mm ≤ 5 mm 2 GHz – 3 GHz ≥ 28 mm ≤ 5 mm, *≤ 8 mm ≤ 4 mm 3 – 4 GHz ≥ 25 mm ≤ 5 mm, *≤ 7 mm ≤ 3 mm 4 – 6 GHz ≥ 22 mm ≤ 4 mm, *≤ 5 mm ≤ 2 mm *optional x-y coordinate spatial resolution when Area Scan SAR ≤ 87.5% of applicable SAR limit o Power Drift Measurement The Power Drift Measurement measures the field at the same location as the most recent power reference measurement within the same procedure, and with the same settings. The Power Drift Measurement gives the field difference in dB from the reading conducted within the last Power Reference Measurement. The absolute value of this difference must be ≤ 0.21 dB; if it is not, the entire test is repeated or the difference accounted for. Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 20 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 11 SAR Test Results 11.1 General SAR Testing Notes o From KDB 447498 D01 General RF Exposure Guidance v06, the following test channel reduction was applied to each test position of an exposure condition in each wireless mode and configuration. Initial testing for each test position for each band was performed on the middle required test channel (or required test channel with the highest measured power for WLAN modes). Testing of other required channels within the operating mode of a frequency band is not required when the reported 1-g or 10-g SAR for the mid-band or highest output power channel is: ο‚· ≤ 0.8 W/kg or 2.0 W/kg, for 1-g or 10-g respectively, when the transmission band is ≤ 100 MHz ο‚· ≤ 0.6 W/kg or 1.5 W/kg, for 1-g or 10-g respectively, when the transmission band is between 100 MHz and 200 MHz o All WLAN measurements were made with the device transmitting at 100% duty cycle. o Tissue-simulating liquid temperature was maintained within +/- 2°C of that which was measured during liquid verification. Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 21 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 11.2 WLAN 5 GHz SAR Testing Notes In accordance with KDB 248227 D01 v02r02 Section 5: o When the initial test channel had a reported SAR below 0.8 W/kg, further SAR measurement on the channel with next highest power was not needed. o U-NII-1: o SAR is not required for U-NII-1 band since the same maximum output power is specified for both U-NII-1, U-NII-2A bands and the highest reported SAR for U- NII-2A band is below 1.2 W/kg. o U-NII-2A: o 802.11a was used as the initial test configuration since it has the same specific maximum power as 802.11n HT20 but a lower data rate. o U-NII-2C: o 802.11a was used as the initial test configuration since it has the same specific maximum power as 802.11n HT20 but a lower data rate. o U-NII-3: o 802.11a was used as the initial test configuration since it has the same specific maximum power as 802.11n HT20 but a lower data rate. 11.2.1 WLAN 5.2 GHz SAR Test Results According to KDB 248227 v02r02 Section 5.3.1: When the same maximum output power is specified for both U-NII-1 and U-NII-2A bands, begin SAR measurement in U-NII-2A band by applying the OFDM SAR requirements. If the highest reported SAR for a test configuration is ≤ 1.2 W/kg, SAR is not required for U-NII-1 band for that configuration. Since the highest reported SAR in U-NII-2A is ≤ 1.2 W/kg SAR testing was not performed in U- NII-1. 11.2.2 WLAN 5.3 GH Main Antenna SAR Test Results Meas. Avg. Max. Reported BW Freq. 1g Mode Ant. Position Ch. Pwr. Pwr. 1g SAR (MHz) (MHz) SAR (dBm) (dBm) (W/kg) (W/kg) 802.11a 20 Main Bottom 52 5260 8.02 9.5 0.201 0.283 6 Mbps 11.2.3 WLAN 5.3 GHz Diversity Antenna SAR Test Results Meas. Avg. Max. Reported BW Freq. 1g Mode Ant. Position Ch. Pwr. Pwr. 1g SAR (MHz) (MHz) SAR (dBm) (dBm) (W/kg) (W/kg) 802.11a 0.329 20 Div. Bottom 52 5260 8.32 9.5 0.251 6 Mbps (Plot 1) Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 22 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 11.2.4 WLAN 5.6 GHz Main Antenna SAR Test Results Meas. Avg. Max. Reported BW Freq. 1g Mode Ant. Position Ch. Pwr. Pwr. 1g SAR (MHz) (MHz) SAR (dBm) (dBm) (W/kg) (W/kg) 802.11a 20 Main Bottom 128 5640 8.84 9.5 0.335 0.39 6 Mbps 11.2.5 WLAN 5.6 GHz Diversity Antenna SAR Test Results Meas. Avg. Max. Reported BW Freq. 1g Mode Ant. Position Ch. Pwr. Pwr. 1g SAR (MHz) (MHz) SAR (dBm) (dBm) (W/kg) (W/kg) 802.11a 0.427 20 Div. Bottom 128 5640 8.92 9.5 0.374 6 Mbps (Plot 2) 11.2.6 WLAN 5.8 GHz Main Antenna SAR Test Results Meas. Avg. Max. Reported BW Freq. 1g Mode Ant. Position Ch. Pwr. Pwr. 1g SAR (MHz) (MHz) SAR (dBm) (dBm) (W/kg) (W/kg) 20 Main Bottom 149 5745 8.12 9.5 0.295 0.405 802.11a 20 Main Bottom 157 5785 8.88 9.5 0.345 0.398 6 Mbps 20 Main Bottom 165 5825 8.1 9.5 0.289 0.399 11.2.7 WLAN 5.8 GHz Diversity Antenna SAR Test Results Meas. Avg. Max. Reported BW Freq. 1g Mode Ant. Position Ch. Pwr. Pwr. 1g SAR (MHz) (MHz) SAR (dBm) (dBm) (W/kg) (W/kg) 0.457 20 Main Bottom 149 5745 8.83 9.5 0.392 (Plot 3) 802.11a 6 Mbps 20 Main Bottom 157 5785 8.74 9.5 0.383 0.456 20 Main Bottom 165 5825 8.36 9.5 0.347 0.451 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 23 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 12 SAR System Verification System Verifications were performed in accordance with IEEE 1528-2013 and KDB 865664 D01 v01r04. Verifications were performed for each frequency band and within the valid range of each probe calibration point required for testing the device. The same SAR probe(s) and tissue-equivalent liquid combinations used with each SAR system for system verification were used for device testing. Verifications were performed before each series of SAR measurements using the same calibration point and tissue-equivalent medium and every three days thereafter when necessary. The test setup diagram is shown below. A CW signal is created by a signal generator and fed through a power amplifier with directional coupler outputs. The forward output power is adjusted to 20 dBm while the coupled output power is normalized to 0dB for easy monitoring. When the forward power is attached to the dipole, the power is then adjusted if necessary so that the coupled channel again reads 0 dB on the power meter. Tissue-simulating liquid depth in the phantom is maintained to be at least 15 cm for frequencies below 3 GHz and 10 cm for frequencies above 5 GHz. Robotic Arm Data Acquisition Electronics Signal Generator Dosimetric Probe Flat Phantom Power Amplifier / Validation Directional Coupler Dipole Monitor Channel 20 dBm CW Signal Power Meter System Verification Setup Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 24 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 12.1 SAR System Verification Results All verifications are performed with a 100 mW (20 dBm) input to the dipole. The resultant measured SAR is normalized to 1 W (30 dBm) for comparison to calibrated dipole targets. All normalized SAR system verification results were within 10% of the respective dipole target values. Norm. Dipole Dev. Meas. Tissue- 1-g Target from Probe Freq. 1-g Date Sim. Dipole SAR 1-g Target SN (MHz) SAR Liquid (W/kg) SAR 1-g SAR (W/kg) (W/kg) (%) 1.33 5/7/2018 MSL 3999 D5GHzV2/1158 5250 7.6 76 75 (Plot 4) -2.24 5/7/2018 MSL 3999 D5GHzV2/1158 5600 7.87 78.7 80.5 (Plot 5) -2.35 5/7/2018 MSL 3999 D5GHzV2/1158 5750 7.49 74.9 76.7 (Plot 6) Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 25 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 13 Tissue-Simulating Liquid Verification (KDB 854664 D01 v01r04 Section 2.4) The tissue dielectric parameters of tissue-equivalent media used for SAR measurements must be characterized within a temperature range of 18°C to 25°C, measured with calibrated instruments and apparatuses, such as network analyzers and temperature probes. The temperature of the tissue-equivalent medium during SAR measurement must also be within 18°C to 25°C and within ± 2°C of the temperature when the tissue parameters are characterized. The tissue dielectric measurement system must be calibrated before use. The dielectric parameters must be measured before the tissue-equivalent medium is used in a series of SAR measurements. The parameters should be re-measured after each 3 – 4 days of use; or earlier if the dielectric parameters can become out of tolerance; for example, when the parameters are marginal at the beginning of the measurement series. The target parameters for the tissue-simulating liquids are obtained from the following table from KDB 865664 D01: Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 26 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 13.1 Tissue-Simulating Liquid Ingredients and Maintenance The Tissue-simulating liquids were manufactured by SPEAG. The following information on the maintenance of MSL 2450 Ingredients: Water, DGBE MBBL 3500 – 5800 Ingredients: Water, Mineral Oil, Emulsifiers, Sodium Chloride DGBE BASED LIQUIDS DGBE is easily dissolved in water. Given a DGBE-water mixture, mainly water will evaporate, however DGBE will evaporate to a smaller percentage. For the frequency liquids around 2.5 GHz, no NaCl is contained and should therefore not be added for any corrections. Evaporated water can be replaced and will mainly increase the permittivity, and to a small extent the conductivity, typically as follows: HSLxxxxV2: permittivity 0.8 to 1.0 per % of water, conductivity 0 to 0.1 per % of water MSLxxxxV2: permittivity 0.8 per % of water, conductivity 0 to 0.01 per % of water OIL BASED LIQUIDS Oil based liquids are an emulsion of a complex mixture of ingredients. Their appearance is yellow or brown transparent or slightly opaque / milky in most cases. Some older liquids may show a non-transparent upper zone with a creamy appearance after some time without stirring. Before using or handling the liquid, it must therefore be stirred to become entirely homogeneous. An opaque appearance is possible but will not influence the dielectric parameters if it is homogeneous during the measurement at the probe surface. Evaporated water can be replaced and will increase the permittivity, and to a smaller extent the conductivity. The sensitivities to water addition (% parameter increase per weight% water added) of oil based SPEAG broadband tissue simulating liquids at the frequencies of interest are typically in the following range: HBBL3500-5800V5 at 3.5 GHz: permittivity 0.79, conductivity 0.14 at 5.5 GHz: permittivity 0.83, conductivity 0.41 MBBL3500-5800V5 at 3.5 GHz: permittivity 0.44, conductivity 0.00 at 5.5 GHz: permittivity 0.48, conductivity 0.18 The temperature gradients shall be observed especially during conductivity measurement: HBBL3500-5800V5 at 3.5 GHz: permittivity -0.07, conductivity -0.43 %/°C at 5.5 GHz: permittivity -0.23, conductivity -0.96 %/°C MBBL3500-5800V5 at 3.5 GHz: permittivity -0.35, conductivity -1.14 %/°C at 5.5 GHz: permittivity -0.08, conductivity -1.52 %/°C Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 27 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 13.2 Tissue-Simulating Liquid Measurements Tissue- Rel. ε'r Cond. Target σ Freq. Target Date Simulating Perm. Dev. σ σ Dev. (MHz) ε'r Liquid ε’r % (S/m) (S/m) % MBBL 600- 5250 47.18 48.95 -3.62 5.445 5.36 1.59 6000 5260 47.13 48.9 -3.62 5.449 5.37 1.47 5/7/2018 160204-3 5320 46.91 48.85 -3.97 5.568 5.44 2.35 22.5 °C 5350 46.97 48.82 -3.78 5.598 5.47 2.34 MBBL 600- 5500 47.82 48.61 -1.63 5.45 5.65 -3.54 6000 5600 47.64 48.47 -1.71 5.595 5.77 -3.03 5/7/2018 160204-3 22.4 °C 5700 47.46 48.34 -1.82 5.743 5.88 -2.33 MBBL 600- 5725 47.75 48.2 -0.93 5.802 5.91 -1.83 6000 5800 47.64 48.2 -1.16 5.906 6 -1.57 5/7/2018 160204-3 5825 47.57 48.17 -1.25 5.946 6.03 -1.39 22.5 °C Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 28 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 14 System Specification 14.1 SPEAG DASY5 SYSTEM DASY 5 system performing SAR testing contains the following items, which are illustrated in the figure below. ο‚· 6-axis robot (model: TX90XL) with controller and teach pendant. ο‚· Dosimetric E-field probe. ο‚· Light beam unit which allows automatic “tooling” of the probe. ο‚· The electro-optical convertor (EOC) which is mounted on the robot arm. ο‚· The data acquisition electronics (DAE). ο‚· Elliptical Phantom ο‚· Device holder. ο‚· Remote control. ο‚· PC. ο‚· DASY5 software. ο‚· Validation dipole. DASY5 System Setup Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 29 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 15 Measurement Uncertainty KDB 865664 D01 v01r04 section 2.8.2 says: Extensive SAR measurement uncertainty analysis is required in SAR reports only when the highest measured SAR in a frequency band is ≥ 1.5 W/kg for 1-g SAR. The highest measured 1-g SAR in this report is 0.392 W/kg. Therefore, SAR measurement uncertainty analysis is not required for this report. Overall SAR system measurement uncertainty is less than 30% with a confidence factor k=2 in order to meet standard requirements. Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 30 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 16 Appendices The following are contained in the attached appendices: ο‚· Highest SAR Test and SAR System Verification Plots ο‚· SAR Test Setup Photos ο‚· Calibration Report Documents for: o Validation Dipole D5GHzV2-1158_April18 o Dosimetric Probe EX3-3999_Dec17 Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 31 of 32 Microsoft EMC Laboratory

Model: 1836 FCC ID: C3K1836 End of Test Report Test Report#: S-TR136-FCCSAR-3 Issued: 06/07/2018 Page 32 of 32 Microsoft EMC Laboratory


Document Created: 2018-06-07 16:50:36
Document Modified: 2018-06-07 16:50:36
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