RF exposure evaluation

FCC ID: KA2CHS161A1

RF Exposure Info

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FCCID_4023017

FCC RF EXPOSURE EVALUATION REPORT FCC ID: KA2CHS161A1 Project No. : 1808H001 Equipment : Wi-Fi Water Sensor Model : DCH-S161 Applicant : D-Link Corporation Address : 17595 Mt. Herrmann, Fountain Valley, California, United States 92708 Exposure category : General population/uncontrolled environment EUT Type: : Production Unit (Engineer Sample) Device Type : Mobile Device

1. Evaluation Method Systems operating under the provisions of FCC 47 CFR section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as mobile device whereby a distance of 0.2m normally can be maintained between the user and the device, and below RF Permissible Exposure limit shall comply with. In accordance with KDB447498D01 for Simultaneous transmission MPE test exclusion applies when the sum of the MPE ratios for all simultaneous transmitting antennas incorporated in a host device, based on the calculated/estimated, numerically modeled or measured field strengths or power density, is ≤ 1.0. The MPE ratio of each antenna is determined at the minimum test separation distance required by the operating configurations and exposure conditions of the host device, according to the ratio of field strengths or power density to MPE limit, at the test frequency. Either the maximum peak or spatially averaged results from measurements or numerical simulations may be used to determine the MPE ratios. Spatial averaging does not apply when MPE is estimated using simple calculations based on far- field plane-wave equivalent conditions. The antenna installation and operating requirements for the host device must meet the minimum test separation distances required by all antennas, in both standalone and simultaneous transmission operations, to satisfy compliance. 2. Limits for General Population/Uncontrolled Exposure 3. 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 447498 D01 General RF Exposure Guidance v06: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies. FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits. FCC CFR 47 part2 2.1093: Radiofrequency radiation exposure evaluation: portable devices

4. Calculation Method Predication of MPE limit at a given distance Equation from page 18 of OET Bulletin 65, Edition 97-01 S=PG/4πR² Where: S=power density P=power input to antenna G=power gain of the antenna in the direction of interest relative to an isotropic radiator R=distance to the center of radiation of the antenna 5. Conducted Power Results 5.1 Test Setup 5.2 Test Equipment Item Kind of Equipment Manufacturer Type No. Serial No. Calibrated until 1 Power Meter ANRITSU ML2495A 1128009 Aug.20, 2018 2 Pulse Power Sensor ANRITSU MA2411B 1027500 Aug.20, 2018 Remark: all calibration period of equipment list is one year. 5.3 Test Procedure a. The EUT was directly connected to the power meter and antenna output port as show in the block diagram Test Setup. b. Setup EUT work at duty cycle more than 98%; c. Read power sensor values in Peak detector; 5.4 Test Results and Manufacturing Tolerance Maximum Peak power declared by Manufacturer Mode Antenna 0

802.11b ≤ 18.50 802.11g ≤ 23.00 802.11n(20 MHz) ≤ 22.50 802.11n(40 MHz) ≤21.50 6. Antenna Information Maximum Peak Gain Antenna Manufacturer Model Name Antenna Type Connector (dBi) Antenna 0 N/A WL6DR1500 PCB N/A 0 7. Evaluation Results 7.1 Standalone Antenna 0 Antenna Antenna Output power Duty MPE MPE Limits Mode Gain Gain Cycle (W/m2) (W/m2) (dBm) (W) (dBi) (linear) 802.11b 18.48 0.070 0 1.0000 100% 0.0140 1.0000 802.11g 22.57 0.018 0 1.0000 100% 0.0360 1.0000 802.11n(20 MHz) 22.08 0.161 0 1.0000 100% 0.0321 1.0000 802.11n(40 MHz) 21.49 0.140 0 1.0000 100% 0.0281 1.0000 Remark: 1. Maximum power including tune-up tolerance; 2. EIRP including tune-up tolerance; 3. MPE use distance is 20cm from manufacturer declaration of user manual. 8. Conclusion The measurement results comply with the FCC Limit per 47 CFR 2.1093 for the uncontrolled RF Exposure and SAR Exclusion Threshold per KDB 447498 v06.


Document Created: 2018-09-27 10:12:45
Document Modified: 2018-09-27 10:12:45
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