RF Exposure report

FCC ID: A4R-WT3

RF Exposure Info

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FCCID_3996954

RF Exposure Report Report No.: SA180604C04 R1 FCC ID: (1) A4R-WT3 (2) A4R-WT4 Test Model: WT3 Received Date: Jun. 04, 2018 Date of Evaluation: Jul. 13, 2018 Issued Date: Sep. 03, 2018 Applicant: Google LLC Address: 1600 Amphitheatre Parkway, Mountain View, California, United States 94043 Issued By: Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch Lab Address: No. 47-2, 14th Ling, Chia Pau Vil., Lin Kou Dist., New Taipei City, Taiwan, R.O.C. Test Location: No. 19, Hwa Ya 2nd Rd, Wen Hwa Vil, Kwei Shan Dist., Taoyuan City 33383, Taiwan (R.O.C) FCC Registration / 788550 / TW0003 Designation Number: This report is for your exclusive use. Any copying or replication of this report to or for any other person or entity, or use of our name or trademark, is permitted only with our prior written permission. This report sets forth our findings solely with respect to the test samples identified herein. The results set forth in this report are not indicative or representative of the quality or characteristics of the lot from which a test sample was taken o r any similar or identical product unless specifically and expressly noted. Our report includes all of the tests requested by you and the results thereof based upon the information t hat you provided to us. You have 60 days from date of issuance of this report to notify us of any material error or omission caused by our negligence, provided, however, that such notice shall be in writing and shall specifically address the issue you wish to raise. A failure to raise such issue within the prescribed time shall constitute your unqualified acceptance of the completeness of this report, the tests conducted and the correctness of the report contents. Unless specific mention, the uncertainty of measurement has been explicitly taken into account to declare the compliance or non-compliance to the specification. The report must not be used by the client to claim product certification, approval, or endorsement by TAF or any government agencies. Report No.: SA180604C04 R1 Page No. 1 / 6 Report Format Version: 6.1.1 Canc els and replac es the report No. SA180604C04 dated Jul. 23, 2018

Table of Contents Release Control Record ........................................................................................................................ 3 1 Certificate of Conformity ............................................................................................................. 4 2 RF Exposure ............................................................................................................................... 5 2.1 Limits for Maximum Permissible Exposure (MPE) ........................................................................ 5 2.2 MPE Calculation Formula........................................................................................................... 5 2.3 Classification ............................................................................................................................. 5 2.4 Antenna Gain ............................................................................................................................ 5 2.5 Calculation Result Of Maximum Conducted Power ...................................................................... 6 Report No.: SA180604C04 R1 Page No. 2 / 6 Report Format Version: 6.1.1 Canc els and replac es the report No. SA180604C04 dated Jul. 23, 2018

Release Control Record Issue No. Description Date Issued SA180604C04 Original Release Jul. 23, 2018 SA180604C04 R1 Add FCC ID Sep. 03, 2018 Report No.: SA180604C04 R1 Page No. 3 / 6 Report Format Version: 6.1.1 Canc els and replac es the report No. SA180604C04 dated Jul. 23, 2018

1 Certificate of Conformity Product: Study Hub Brand: Verily Test Model: WT3 Sample Status: Production Unit Applicant: Google LLC Date of Evaluation: Jul. 13, 2018 Standards: FCC Part 2 (Section 2.1091) KDB 447498 D01 General RF Exposure Guidance v06 IEEE C95.1-1992 The above equipment has been tested by Bureau Veritas Consumer Products Services (H.K.) Ltd., Taoyuan Branch, and found compliance with the requirement of the above standards. The test record, data evaluation & Equipment Under Test (EUT) configurations represented herein are true and accurate accounts of the measurements of the sample’s EMC characteristics under the conditions specified in this report. Prepared by : , Date: Sep. 03, 2018 Rona Chen / Specialist Approved by : , Date: Sep. 03, 2018 Dylan Chiou / Project Engineer Report No.: SA180604C04 R1 Page No. 4 / 6 Report Format Version: 6.1.1 Canc els and replac es the report No. SA180604C04 dated Jul. 23, 2018

2 RF Exposure 2.1 Limits for Maximum Permissible Exposure (MPE) Frequency Range Electric Field Magnetic Field Power Density Average Time (MHz) Strength (V/m) Strength (A/m) (mW/cm2) (minutes) 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 2.2 MPE Calculation Formula Pd = (Pout*G) / (4*pi*r 2) where Pd = power density in mW/cm2 Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = distance between observation point and center of the radiator in cm 2.3 Classification The antenna of this product, under normal use condition, is at least 20cm away from the body of the user. So, this device is classified as Mobile Device. 2.4 Antenna Gain WWAN Antenna Antenna Type Fixed Int ernal WCDMA LTE Band II VI V 2 4 5 12 17 30 38 66 Gain 3.81 2.51 1.53 3.81 2.51 1.53 2.63 2.35 3.68 1.87 2.51 BT/WLAN Antenna Antenna Type PIFA BT WLAN Frequency 2.4 GHz 2.4 GHz 5.15~5.25 GHz 5.25~5.35 GHz 5.47~5.725 GHz 5.725~ 5.825 GHz Gain 1.72 2.42 3.61 3.48 3.08 3.35 Report No.: SA180604C04 R1 Page No. 5 / 6 Report Format Version: 6.1.1 Canc els and replac es the report No. SA180604C04 dated Jul. 23, 2018

2.5 Calculation Result of Maximum Conducted Power Frequency Band Max Power Antenna Gain Distance Power Density Limit Band (MHz) (dBm) (dBi) (cm) (mW/cm2) (mW/cm2) WCDMA II 1850-1910 23.62 3.81 20 0.110 1.00 WCDMA IV 1710-1755 23.77 2.51 20 0.084 1.00 WCDMA V 824-849 23.76 1.53 20 0.067 0.55 LTE 2 1850-1910 22.75 3.81 20 0.090 1.00 LTE 4 1710-1755 23.27 2.51 20 0.075 1.00 LTE 5 824-849 22.72 1.53 20 0.053 0.55 LTE 12 699-716 22.88 2.63 20 0.071 0.47 LTE 17 704-716 23.00 2.35 20 0.068 0.47 LTE 30 2305-2315 23.03 3.68 20 0.093 1.00 LTE 38 2570-2620 22.96 1.87 20 0.060 1.00 LTE 66 1710-1780 23.25 2.51 20 0.075 1.00 2412-2462 19.42 5.43 20 0.061 1.00 5180-5240 18.10 6.62 20 0.059 1.00 WLAN 5260-5320 18.50 6.62 20 0.065 1.00 5500-5700 18.76 6.62 20 0.069 1.00 5745-5825 18.45 6.62 20 0.064 1.00 BT 2402-2480 9.55 1.72 20 0.003 1.00 NOTE: 1. Max power used is already max. tune up power for RF exposure evaluation 2. 2.4GHz: Directional gain = 2.42 dBi + 10log(2) = 5.43dBi 3. 5.0GHz: Directional gain = 3.61 dBi + 10log(2) = 6.62dBi Conclusion: The formula of calculated the MPE is: CPD1 / LPD1 + CPD2 / LPD2 + ……etc. < 1 CPD = Calculation power density LPD = Limit of power density WWAN + WLAN + BT = 0.071 / 0.47 + 0.069 / 1.00 + 0.003 / 1.00 = 0.223 Therefore the maximum calculations of above situations are less than the “1” limit. --- END --- Report No.: SA180604C04 R1 Page No. 6 / 6 Report Format Version: 6.1.1 Canc els and replac es the report No. SA180604C04 dated Jul. 23, 2018


Document Created: 2019-10-17 17:41:39
Document Modified: 2019-10-17 17:41:39
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