RF Exposure

FCC ID: 2AC7Z-ESP8266EX

RF Exposure Info

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FCCID_2436298

Report No.: RXA1409-0216MPE01 Page 1 of 5 : MPE REPORT Product Name Wi-Fi Internet of Things Module Manufacture ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD Model ESP8266EX FCC ID 2AC7Z-ESP8266EX Date of issue October 21, 2014 Revised by Performed by Approved by Minbao Ling Jian Qi Kai Xu SAR Manager SAR Engineer Director Test By Company: TA Technology (Shanghai) Co., Ltd. Address: No.145, Jintang Rd, Tangzhen Industry Park, Pudong Shanghai,China Contact: Xu Kai Telephone: +86-021-50791141/2/3 Fax: +86-021-50791141/2/3-8000 Website: http://www.ta-shanghai.com E-mail: yangweizhong@ta-shanghai.com

TA Technology (Shanghai)Co.,Ltd. Test Report Report No.: RXA1409-0216MPE01 Page 2 of 5 Maximum Permissible Exposure Type of EUT: Wi-Fi Internet of Things Module FCC ID: 2AC7Z-ESP8266EX Manufacturer: ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD Model: ESP8266EX Maximum conducted output power (measured) and antenna Gain: Band Output Power(dBm) 802.11b 22.49 802.11g 24.25 802.11n(20M) 24.22 maximum tune up procedure Antenna Gain Band (dBm) (dBi) 802.11b 23 2 802.11g 25 2 802.11n(20M) 25 2 According to section 1.1310 of FCC 47 CFR Part 1, limits for maximum permissible exposure (MPE) are as following

TA Technology (Shanghai)Co.,Ltd. Test Report Report No.: RXA1409-0216MPE01 Page 3 of 5 Note1. Occupational/controlled limits apply in situations in which persons are exposed as a consequence of their employment provided those persons are fully aware of the potential for exposure and can exercise control over their exposure. Limits for occupational/controlled exposure also apply in situations when an individual is transient through a location where occupational / controlled limits apply provided he or she is made aware of the potential for exposure. Note2: General population/uncontrolled exposures apply in situations in which the general public may be exposed, or in which persons that are exposed as a consequence of their employment may not be fully aware of the potential for exposure or can not exercise control over their exposure.

TA Technology (Shanghai)Co.,Ltd. Test Report Report No.: RXA1409-0216MPE01 Page 4 of 5 The maximum permissible exposure for 300~1500MHz is f/1500, 1500~100,000MHz is f/1500.So Band The maximum permissible exposure 802.11b/g/n 1 mW/cm² IMPORTANT NOTE: To comply with the FCC RF exposure compliance requirements, the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. No change to the antenna or the device is permitted. Any change to the antenna or the device could result in the device exceeding the RF exposure requirements and void user’s authority to operate the device.

TA Technology (Shanghai)Co.,Ltd. Test Report Report No.: RXA1409-0216MPE01 Page 5 of 5 RF Exposure Calculations: The following information provides the minimum separation distance for the highest gain antenna provided. This calculation is based on the conducted power, considering maximum power and antenna gain. The formula shown in KDB 865664 D01 is used in the calculation. Equation from KDB 865664 D01, Edition 97-01 is: 2 S= PG / 4∏R 2 where: S = power density (in appropriate units, e.g. mW/cm ) P = Time-average maximum tune up procedure (in appropriate units, e.g., mW) G = the numeric gain of the antenna R = distance to the center of radiation of the antenna (20 cm = limit for MPE) So, the numeric gain (G) of the antenna with a gain specified in dB is determined by Numeric gain (G)=10^(antenna gain/10)=10^(2/10)=1.58 dB 802.11b PG = 23dBm+ (2dBi) =25dBm=316mW 802.11g PG = 25dBm+ (2dBi) =27dBm= 501mW 802.11n(20M) PG = 25dBm+(2dBi)=27dBm= 501mW R =20 cm ∏= 3.1416 Solving for S, the power density at 20 cm is 2 2 Band Test Result (mW/cm ) Limit Value (mW/cm ) 802.11b 0.06 1 mW/cm² 802.11g 0.10 1 mW/cm² 802.11n(20M) 0.10 1 mW/cm² Note: For mobile or fixed location transmitters, minimum separation distance is 20cm, even if calculations indicate MPE distance is less.


Document Created: 2019-10-22 08:24:47
Document Modified: 2019-10-22 08:24:47
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