MM-831-KKOH1 FCC PART 15.249 Test Report

FCC ID: 2AR8X-MM831KKOH1

Test Report

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FCCID_4495713

Page 1 of 26 Report No.: HK1909042413-E FCC TEST REPORT Test report On Behalf of Cooler Master Technology Inc. For MM831 Model No.: MM-831-KKOH1 FCC ID: 2AR8X-MM831KKOH1 Prepared for : Cooler Master Technology Inc. 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist., New Taipei City 23856, Taiwan Prepared By : Shenzhen HUAK Testing Technology Co., Ltd. 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen City, China Date of Test: Aug. 24, 2019 ~ Sept. 11, 2019 Date of Report: Sept. 11, 2019 Report Number: HK1909042413-E

Page 2 of 26 Report No.: HK1909042413-E TEST RESULT CERTIFICATION Applicant’s name ................. : Cooler Master Technology Inc. 8F., No. 788-1, Zhongzheng Rd., Zhonghe Dist., New Taipei City Address ................................. : 23856, Taiwan Manufacture's Name ............ : Heatmoving Electronic Technology Co. Ltd No.28, jinyuling road, sangyuan, dongcheng district, dongguan Address ................................. : city, China Product description Trade Mark: Cooler Master Product name ........................... : MM831 Model and/or type reference : MM-831-KKOH1 FCC Rules and Regulations Part 15 Subpart C Section 15.249 Standards ............................. : ANSI C63.10: 2013 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Date of Test ............................................ : Date (s) of performance of tests ............. : Aug. 24, 2019 ~ Sept. 11, 2019 Date of Issue ........................................... : Sept. 11, 2019 Test Result .............................................. : Pass Testing Engineer : (Gary Qian) Technical Manager : (Eden Hu) Authorized Signatory : (Jason Zhou)

Page 3 of 26 Report No.: HK1909042413-E Table of Contents Page 1 . TEST SUMMARY 4 2 . GENERAL INFORMATION 5 2.1 GENERAL DESCRIPTION OF EUT 5 2.2 Carrier Frequency of Channels 6 2.3 Operation of EUT during testing 6 2.4 DESCRIPTION OF TEST SETUP 6 2.5 MEASUREMENT INSTRUMENTS LIST 7 3 . CONDUCTED EMISSIONS TEST 8 3.1 Conducted Power Line Emission Limit 8 3.2 Test Setup 8 3.3 Test Procedure 8 3.4 Test Result 8 4 RADIATED EMISSION TEST 11 4.1 Radiation Limit 11 4.2 Test Setup 11 4.3 Test Procedure 12 4.4 Test Result 12 5 BAND EDGE 18 5.1 Limits 18 5.2 Test Procedure 18 5.3 Test Result 19 6 OCCUPIED BANDWIDTH MEASUREMENT 21 6.1 Test Setup 21 6.2 Test Procedure 21 6.3 Measurement Equipment Used 21 6.4 Test Result 21 7 ANTENNA REQUIREMENT 23 8 PHOTOGRAPH OF TEST 24 8.1 Radiated Emission 24 8.2 Conducted Emission 25 9 PHOTOS OF THE EUT 26

Page 4 of 26 Report No.: HK1909042413-E 1. TEST SUMMARY 1.1 TEST PROCEDURES AND RESULTS DESCRIPTION OF TEST RESULT CONDUCTED EMISSIONS TEST COMPLIANT RADIATED EMISSION TEST COMPLIANT BAND EDGE COMPLIANT OCCUPIED BANDWIDTH MEASUREMENT COMPLIANT ANTENNA REQUIREMENT COMPLIANT 1.2 TEST FACILITY Test Firm ： Shenzhen HUAK Testing Technology Co., Ltd. Address ： 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen City, China 1.3 MEASUREMENT UNCERTAINTY Measurement Uncertainty Conducted Emission Expanded Uncertainty = 2.23dB, k=2 Radiated emission expanded uncertainty(9kHz-30MHz) = 3.08dB, k=2 Radiated emission expanded uncertainty(30MHz-1000MHz) = 4.42dB, k=2 Radiated emission expanded uncertainty(Above 1GHz) = 4.06dB, k=2

Page 5 of 26 Report No.: HK1909042413-E 2. GENERAL INFORMATION 2.1 GENERAL DESCRIPTION OF EUT Equipment MM831 Model Name MM-831-KKOH1 Serial Model N/A Model Difference N/A FCC ID 2AR8X-MM831KKOH1 Antenna Type PCB Antenna Antenna Gain 0dBi Equipment MM831 Operation frequency 2402-2480MHz Number of Channels 79CH Modulation Type GFSK Power Source DC 5V From USB Power Rating DC 5V From USB

Page 6 of 26 Report No.: HK1909042413-E 2.2 Carrier Frequency of Channels Channel Frequency (MHz) 00 2402 01 2403 ... ... 38 2440 39 2441 40 2442 ... ... 77 2479 78 2480 2.3 Operation of EUT during testing Operating Mode The mode is used: Transmitting mode Low Channel: 2402MHz Middle Channel: 2440MHz High Channel: 2480MHz 2.4 DESCRIPTION OF TEST SETUP Operation of EUT during conducted testing and Radiation testing: AC Main PC EUT Operation of EUT Above1GHz Radiation testing: PC EUT ● PC information Model: TP00067A Input: DC20V, 2.25-3.25A Output: 5VDC, 0.5A The sample was placed (0.1m below 1GHz, 0.1m above 1GHz) above the ground plane of 3m chamber. Measurements in both horizontal and vertical polarities were performed. During the test, each emission was maximized by: having the EUT continuously working, investigated all operating modes, rotated about all 3 axis (X, Y & Z) and considered typical configuration to obtain worst position, manipulating interconnecting cables, rotating the turntable, varying antenna height from 1m to 4m in both horizontal and vertical polarizations. The emissions worst-case are shown in Test Results of the following pages. The worst case is X position.

Page 7 of 26 Report No.: HK1909042413-E 2.5 MEASUREMENT INSTRUMENTS LIST Cal. Item Equipment Manufacturer Model No. Serial No. Last Cal. Interval L.I.S.N. 1. Artificial Mains R&S ENV216 HKE-002 Dec. 27, 2018 1 Year Network 2. Receiver R&S ESCI 7 HKE-010 Dec. 27, 2018 1 Year RF automatic 3. Tonscend JS0806-2 HKE-060 Dec. 27, 2018 1 Year control unit 4. Spectrum analyzer R&S FSP40 HKE-025 Dec. 27, 2018 1 Year 5. Spectrum analyzer Agilent N9020A HKE-048 Dec. 27, 2018 1 Year 6. Preamplifier Schwarzbeck BBV 9743 HKE-006 Dec. 27, 2018 1 Year 7. EMI Test Receiver Rohde & Schwarz ESCI 7 HKE-010 Dec. 27, 2018 1 Year Bilog Broadband 8. Schwarzbeck VULB9163 HKE-012 Dec. 27, 2018 1 Year Antenna FMZB 1519 9. Loop Antenna Schwarzbeck HKE-014 Dec. 27, 2018 1 Year B 10. Horn Antenna Schewarzbeck 9120D HKE-013 Dec. 27, 2018 1 Year EMC051845 11. Pre-amplifier EMCI HKE-015 Dec. 27, 2018 1 Year SE 12. Pre-amplifier Agilent 83051A HKE-016 Dec. 27, 2018 1 Year EMI Test Software JY3120-B 13. Tonscend HKE-083 Dec. 27, 2018 N/A EZ-EMC Version 14. Power Sensor Agilent E9300A HKE-086 Dec. 27, 2018 1 Year 15. Spectrum analyzer Agilent N9020A HKE-048 Dec. 27, 2018 1 Year 16. Signal generator Agilent N5182A HKE-029 Dec. 27, 2018 1 Year 17. Signal Generator Agilent 83630A HKE-028 Dec. 27, 2018 1 Year 18. Shielded room Shiel Hong 4*3*3 HKE-039 Dec. 27, 2018 3 Year

Page 8 of 26 Report No.: HK1909042413-E 3. CONDUCTED EMISSIONS TEST 3.1 Conducted Power Line Emission Limit For unintentional device, according to § 15.107(a) Line Conducted Emission Limits is as following * Decreasing linearly with the logarithm of the frequency For intentional device, according to §15.207(a) Line Conducted Emission Limit is same as above table. 3.2 Test Setup 3.3 Test Procedure 1, The equipment was set up as per the test configuration to simulate typical actual usage per the user’s manual. The EUT is a tabletop system, a wooden table with a height of 0.8 meters is used and is placed on the ground plane as per ANSI C63.10. 2, Support equipment, if needed, was placed as per ANSI C63.10. 3, All I/O cables were positioned to simulate typical actual usage as per ANSI C63.10. 4, If a EUT received DC power from the USB Port of Notebook PC, the PC’s adapter received AC120V/60Hz power through a Line Impedance Stabilization Network (LISN) which supplied power source and was grounded to the ground plane. 5, All support equipments received AC power from a second LISN, if any. 6, The EUT test program was started. Emissions were measured on each current carrying line of the EUT using a spectrum Analyzer / Receiver connected to the LISN powering the EUT. The LISN has two monitoring points: Line 1 (Hot Side) and Line 2 (Neutral Side). Two scans were taken: one with Line 1 connected to Analyzer / Receiver and Line 2 connected to a 50 ohm load; the second scan had Line 1 connected to a 50 ohm load and Line 2 connected to the Analyzer / Receiver. 7, Analyzer / Receiver scanned from 150 KHz to 30MHz for emissions in each of the test modes. 3.4 Test Result PASS All the test modes completed for test. only the worst result of of AC240V/60Hz (GFSK High Channel ) was reported as below:

Page 9 of 26 Report No.: HK1909042413-E Test Specification: Line Remark: Margin = Limit – Level

Page 10 of 26 Report No.: HK1909042413-E Test Specification: Neutral Remark: Margin = Limit – Level

Page 11 of 26 Report No.: HK1909042413-E 4 RADIATED EMISSION TEST 4.1 Radiation Limit For unintentional device, according to § 15.109(a), except for Class A digital devices, the field strength of radiated emissions from unintentional radiators at a distance of 3 meters shall not exceed the following values： Frequency Distance Radiated Radiated (MHz) (Meters) (dBμV/m) (μV/m) 30-88 3 40 100 88-216 3 43.5 150 216-960 3 46 200 Above 960 3 54 500 For intentional device, according to § 15.209(a), the general requirement of field strength of radiated emissions from intentional radiators at a distance of 3 meters shall not exceed the above table. 4.2 Test Setup （1）Radiated Emission Test-Up Frequency Below 30MHz （2）Radiated Emission Test-Up Frequency 30MHz~1GHz

Page 12 of 26 Report No.: HK1909042413-E （3）Radiated Emission Test-Up Frequency Above 1GHz 4.3 Test Procedure 1. Below 1GHz measurement the EUT is placed on turntable which is 0.8m above ground plane. And above 1GHz measurement EUT was placed on low permittivity and low tangent turn table which is 1.5m above ground plane. 2. The turntable shall be rotated for 360 degrees to determine the position of maximum emission level. 3. EUT is set 3m away from the receiving antenna, which is varied from 1m to 4m to find out the highest emissions. 4. Maximum procedure was performed on the six highest emissions to ensure EUT compliance. 5. And also, each emission was to be maximized by changing the polarization of receiving antenna both horizontal and vertical. 6. Repeat above procedures until the measurements for all frequencies are complete. 7. The test frequency range from 9KHz to 25GHz per FCC PART 15.33(a). Note: For battery operated equipment, the equipment tests shall be performed using a new battery. 4.4 Test Result PASS All the test modes completed for test. The worst case of Radiated Emission is CH 2402; the test data of this mode was reported.

Page 13 of 26 Report No.: HK1909042413-E Below 1GHz Test Results: Antenna polarity: H Remark: Transd = Cable lose + Antenna factor - Pre-amplifier; Margin = Limit – Level

Page 14 of 26 Report No.: HK1909042413-E Antenna polarity: V Remark: Transd = Cable lose + Antenna factor - Pre-amplifier; Margin = Limit – Level Remark： (1) Measuring frequencies from 9 KHz to the 1 GHz, Radiated emission test from 9KHz to 30MHz was verified, and no any emission was found except system noise floor. (2) * denotes emission frequency which appearing within the Restricted Bands specified in provision of 15.205, then the general radiated emission limits in 15.209 apply. (3) The IF bandwidth of EMI Test Receiver between 30MHz to 1GHz was 120KHz, 1 MHz for measuring above 1 GHz, below 30MHz was 10KHz.

Page 15 of 26 Report No.: HK1909042413-E Above 1 GHz Test Results: CH Low (2402MHz) Horizontal: Meter Frequency Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2402 109.68 -5.84 103.84 114 -10.16 peak 2402 86.34 -5.84 80.5 94 -13.5 AVG 4804 57.62 -3.64 53.98 74 -20.02 peak 4804 43.45 -3.64 39.81 54 -14.19 AVG 7206 55.78 -0.95 54.83 74 -19.17 peak 7206 41.39 -0.95 40.44 54 -13.56 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Meter Frequency Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2402 111.46 -5.84 105.62 114 -8.38 peak 2402 83.46 -5.84 77.62 94 -16.38 AVG 4804 54.35 -3.64 50.71 74 -23.29 peak 4804 45.26 -3.64 41.62 54 -12.38 AVG 7206 52.36 -0.95 51.41 74 -22.59 peak 7206 38.67 -0.95 37.72 54 -16.28 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier.

Page 16 of 26 Report No.: HK1909042413-E CH Middle (2440MHz) Horizontal: Meter Frequency Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2440 108.65 -5.71 102.94 114 -11.06 peak 2440 80.34 -5.71 74.63 94 -19.37 AVG 4880 50.16 -3.51 46.65 74 -27.35 peak 4880 42.33 -3.51 38.82 54 -15.18 AVG 7320 52.79 -0.82 51.97 74 -22.03 peak 7320 38.61 -0.82 37.79 54 -16.21 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Meter Frequency Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2440 104.62 -5.71 98.91 114 -15.09 peak 2440 84.25 -5.71 78.54 94 -15.46 AVG 4880 55.31 -3.51 51.8 74 -22.2 peak 4880 43.65 -3.51 40.14 54 -13.86 AVG 7320 52.97 -0.82 52.15 74 -21.85 peak 7320 40.23 -0.82 39.41 54 -14.59 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier.

Page 17 of 26 Report No.: HK1909042413-E CH High (2480MHz) Horizontal: Meter Frequency Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2480 105.62 -5.65 99.97 114 -14.03 peak 2480 82.64 -5.65 76.99 94 -17.01 AVG 4960 52.13 -3.43 48.7 74 -25.3 peak 4960 41.33 -3.43 37.9 54 -16.1 AVG 7440 53.46 -0.75 52.71 74 -21.29 peak 7440 36.98 -0.75 36.23 54 -17.77 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Meter Frequency Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2480 105.62 -5.65 99.97 114 -14.03 peak 2480 82.36 -5.65 76.71 94 -17.29 AVG 4960 52.79 -3.43 49.36 74 -24.64 peak 4960 44.16 -3.43 40.73 54 -13.27 AVG 7440 56.32 -0.75 55.57 74 -18.43 peak 7440 37.46 -0.75 36.71 54 -17.29 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Remark： (1) Measuring frequencies from 1 GHz to the 25 GHz。 (2) “F” denotes fundamental frequency; “H” denotes spurious frequency. “E” denotes band edge frequency. (3) * denotes emission frequency which appearing within the Restricted Bands specified in provision of 15.205, then the general radiated emission limits in 15.209 apply. (4) Data of measurement within this frequency range shown “--- ” in the table above means the reading of emissions are attenuated more than 20dB below the permissible limits or the field strength is too small to be measured. (5) The IF bandwidth of EMI Test Receiver between 30MHz to 1GHz was 120KHz, 1 MHz for measuring above 1 GHz, below 30MHz was 10KHz. The resolution bandwidth of test receiver/spectrum analyzer is 1MHz and video bandwidth is 3MHz for peak measurement with peak detector at frequency above 1GHz. The resolution bandwidth of test receiver/spectrum analyzer is 1MHz and video bandwidth is 10Hz for Average measurement with peak detection at frequency above 1GHz. (6) When the test results of Peak Detected below the limits of Average Detected, the Average Detected is not need completed. For example: Top Channel at Fundamental 73.16dBuV/m(PK Value) <93.98(AV Limit), at harmonic 53.20 dBuV/m(PK Value) <54 dBuV/m(AV Limit), the Average Detected not need to completed. (7)All modes of operation were investigated and the worst-case emissions are reported.

Page 18 of 26 Report No.: HK1909042413-E 5 BAND EDGE 5.1 Limits FCC PART 15.249(d) Emissions radiated outside of the specified frequency bands, except for harmonics, shall be attenuated by at least 50 dB below the level of the fundamental or to the general radiated emission limits in §15.209, whichever is the lesser attenuation. 5.2 Test Procedure The band edge compliance of RF radiated emission should be measured by following the guidance in ANSI C63.10 with respect to maximizing the emission by rotating the EUT, measuring the emission while the EUT is situated in three orthogonal planes (if appropriate), adjusting the measurement antenna height and polarization etc. Set RBW to 100KHz and VBM to 300KHz to measure the peak field strength and set RBW to 1MHz and VBW to 10Hz to measure the average radiated field strength.The conducted RF band edge was measured by using a spectrum analyzer. Set span wide enough to capture the highest in-band emission and the emission at the band edge. Set RBW to 100 KHz and VBW to 300 KHz, to measure the conducted peak band edge.

Page 19 of 26 Report No.: HK1909042413-E 5.3 Test Result PASS Radiated Band Edge Test: Operation Mode: TX CH Low (2402MHz) Horizontal (Worst case) Frequency Meter Factor Emission Level Limits Margin Reading Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2310 57.62 -5.81 51.81 74 -22.19 peak 2310 / -5.81 / 54 / AVG 2390 52.31 -5.84 46.47 74 -27.53 peak 2390 / -5.84 / 54 / AVG 2400 51.69 -5.84 45.85 74 -28.15 peak 2400 / -5.84 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Frequency Meter Factor Emission Level Limits Margin Reading Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2310 55.32 -5.81 49.51 74 -24.49 peak 2310 / -5.81 / 54 / AVG 2390 52.48 -5.84 46.64 74 -27.36 peak 2390 / -5.84 / 54 / AVG 2400 55.76 -5.84 49.92 74 -24.08 peak 2400 / -5.84 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier.

Page 20 of 26 Report No.: HK1909042413-E Operation Mode: TX CH High (2480MHz) Horizontal (Worst case) Frequency Reading Result Factor Emission Level Limits Margin Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2483.50 56.34 -5.65 50.69 74 -23.31 peak 2483.50 / -5.65 / 54 / AVG 2500.00 53.47 -5.65 47.82 74 -26.18 peak 2500.00 / -5.65 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Frequency Reading Result Factor Emission Level Limits Margin Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2483.50 56.38 -5.65 50.73 74 -23.27 peak 2483.50 / -5.65 / 54 / AVG 2500.00 52.44 -5.65 46.79 74 -27.21 peak 2500.00 / -5.65 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Remark: All the other emissions not reported were too low to read and deemed to comply with FCC limit.

Page 21 of 26 Report No.: HK1909042413-E 6 OCCUPIED BANDWIDTH MEASUREMENT 6.1 Test Setup Same as Radiated Emission Measurement 6.2 Test Procedure 1. The EUT was placed on a turn table which is 0.8m above ground plane. 2. Set EUT as normal operation. 3. Based on ANSI C63.10 section 6.9.2: RBW= 30KHz. VBW= 100 KHz, Span=4MHz. 4. The useful radiated emission from the EUT was detected by the spectrum analyser with peak detector. 6.3 Measurement Equipment Used Same as Radiated Emission Measurement 6.4 Test Result PASS 20dB Bandwidth Frequency Result (MHz) 2402 MHz 0.6153 PASS 2440 MHz 0.7311 PASS 2480 MHz 0.8105 PASS CH: 2402MHz

Page 22 of 26 Report No.: HK1909042413-E CH: 2440MHz CH: 2480MHz

Page 23 of 26 Report No.: HK1909042413-E 7 ANTENNA REQUIREMENT Standard Applicable For intentional device, according to FCC 47 CFR Section 15.203, an intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. Antenna Connected Construction The antenna used in this product is a internal Antenna, The directional gains of antenna used for transmitting is0dBi. ANTENNA

Page 24 of 26 Report No.: HK1909042413-E 8 PHOTOGRAPH OF TEST 8.1 Radiated Emission

Page 25 of 26 Report No.: HK1909042413-E 8.2 Conducted Emission

Page 26 of 26 Report No.: HK1909042413-E 9 PHOTOS OF THE EUT Reference to the reporter : ANNEX A of external photos and ANNEX B of internal photos ---------End of test report---------


Document Created: 2019-10-30 09:28:54
Document Modified: 2019-10-30 09:28:54
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