8A121702FR MPE Report rv1

FCC ID: SLE-AWK3121

RF Exposure Info

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FCCID_1076594

FCC ID : SLE—AWK—3121 Report No. : 8A121702FR Page 1 of 5 Maximum Permissible Exposure (MPE) Evaluation Report Product : Industrial 802.11a/b/g AP/Client Model Number : AWK—3121 According : FCC Guidelines for Human Exposure IEEE C95.1 Applicant : MOXA Inc. Address : Fl.4, No.135, Lane 235, Pao—Chiao Rd., Shing Tien City, Taipei, R.O.C. Issued By : Interocean EMC Technology Corp. LAB Location : 244 No.5—2, Lin 1, Tin—Fu Tsun, Lin—Kou Hsiang, Taipei County, Taiwan, R.O.C. The test report consists of 5 pages in total. It shall not be reproduced except in full, without the written approval of IETC. This document may be altered or revised by IETC only, and shall be noted in the revision section of the document. The test results in the report only to the tested sample. Report Issued : 2009/02/05 Project Engineer: éd in (Ag(il’ Approved : K Adam ng Jerfy Liu

FCC ID：SLE-AWK-3121 Report No.：8A121702FR Page 2 of 5 Table of Contents 1 Introduction 4 2 Classification 4 3 RF Exposure Limit 4 4 Friis Formula 5 5 EUT Operating condition 5 6 Test Results 5

FCC ID：SLE-AWK-3121 Report No.：8A121702FR Page 3 of 5 Summary of Tests Industrial 802.11a/b/g AP/Client Model: AWK-3121 Test Reference Results MPE Evaluation FCC Guidelines for Human Exposure IEEE C95.1 Pass

FCC ID：SLE-AWK-3121 Report No.：8A121702FR Page 4 of 5 RF Exposure Measurement (Fixed use Device) 1 Introduction 2.4GHz frequency band is regarded specially as a dangerous band for its heating harmfulness to the human body. That’s why microwave oven is operating in this frequency band. The manufacturer whose product is working in this frequency band is obligatory to prove the harmfulness of his product. In this document, we try to prove the safety of radiation harmfulness to the human body for our product. The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The Gain of the antenna used in this product is measured in a Fully Anechoic Chamber (FAC), and the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. 2 Classification The antenna of the product, under normal use condition, is at least 20cm away from the body of the user. Warning statement for keeping 20cm separation distance and the prohibition of operating next to a person has been printed on the user’s manual. So, this product is classified as the Fixed use Device 3 RF Exposure Limit According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of human exposure to radio-frequency (RF) radiation as specified in 1.1307(b). LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Electric Field Magnetic Field Power Density Average Time Range Strength (V/m) Strength (A/m) (mW/cm2) (minutes) (MHz) (A) Limits For Occupational / Control Exposures 30-300 61.4 0.163 1.0 6 300-1500 … … F/300 6 1500-100,000 … … 5 6 (B)Limits For General Population / Uncontrolled Exposure 30-300 27.5 0.073 0.2 30 300-1500 … … F/500 30 1500-100,000 … … 1.0 30 F = Frequency in MHz

FCC ID：SLE-AWK-3121 Report No.：8A121702FR Page 5 of 5 4 Friis Formula Friis transmission formula: Pd = (Pout*G) / (4*pi*r2) 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 Pd is the limit of MPE, 1 mW/cm2. If we know the maximum Gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. 5 EUT Operating condition The software provided by Manufacturer enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. 6 Test Results Maximum Output power Limit of Frequency Power density Antenna gain To antenna Power density (MHz) (mW/cm2) (dBi) (dBm) (mW/cm2) 2412 to2462 2 21.51 0.0446 1.0 5150 to 5250 2 16.08 0.0128 1.0 The minimum allowable distance is very close to the enclosure of the antenna. So, the user has no need to worry about the harmfulness of radiation. But it is recommended to always keep, at least, 20cm separation distance with the antenna.


Document Created: 2009-02-25 17:58:56
Document Modified: 2009-02-25 17:58:56
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