MPE Calculation

FCC ID: I28-ZBRZQ3BT

RF Exposure Info

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FCCID_4119881

MPE CALCULATION FCC ID: I28-ZBRZQ3BT I28-RFIDM6EMTT RF Exposure Requirements: 47 CFR §1.1307(b) RF Radiation Exposure Limits: 47 CFR §1.1310 RF Radiation Exposure Guidelines: FCC OST/OET Bulletin Number 65 EUT Frequency Band: 902.75-927.25MHz;2402-2480 MHz, Limits for General Population/Uncontrolled Exposure in the band of: 300-1500MHz;1500-100,000 MHz Power Density Limit: 0.62 mW / cm2 ;1 mW / cm2 Equation: S = PG / 4R2 or R = √PG / 4S Where, S = Power Density P = Power Input to Antenna G = Antenna Gain R = distance to the center of radiated antenna ______________________________________________________________________________________________________________________ EUT: Thermal Printer, Model No.: ZT610, ZT620 Prediction distance 20cm (Bluetooth BDR/EDR): Power = 8.40 dBm, Antenna Gain = 1.69 dBi, Power density = 0.002 mW/cm2 (Bluetooth LE): Power = 5.72 dBm, Antenna Gain = 1.69 dBi, Power density = 0.0011 mW/cm2 CH Conducted Antenna Tolerance Calculated MPE Directional Tune-Up Max Power Measurement Freq Power Gain MPE Limit Pass/ Type Gain (dBi) Tolerance (dBm) Distance (cm) (MHz) (dBm) (dBi) (mW/cm2) (mW/cm2) Fail BLE 2402 4.72 1.69 1.69 ±1dB 5.72 20 0.0011 1 Pass BT-EDR 2402 7.40 1.69 1.69 ±1dB 8.40 20 0.002 1 Pass UHF RFID: Power = 29.11 dBm, Antenna Gain = -36dBi, Power density = 0.0000407 mW/cm2 CH Conducted Antenna Tolerance Calculated MPE Directional Tune-Up Max Power Measurement Freq Power Gain MPE Limit Pass/ Type Gain (dBi) Tolerance (dBm) Distance (cm) (MHz) (dBm) (dBi) (mW/cm2) (mW/cm2) Fail RFID 902.75 28.11 -36 -36 ±1dB 29.11 20 0.0000407 0.62 Pass

Co-location worse case: BT-EDR = (0.002/1) x 100% = 0.2% RFID = (0.0000407/0.62) x 100% = 0.0066% Total MPE Percentage = (0.2+0.0066)%=0.2066%<100% The Above Result had shown that the Device complied with MPE requirement. Completed By: Shuo Zhang SIEMIC, Inc 775 Montague Expressway, Milpitas, CA 95035 Phone: (408) 526-1188 Date: 12/20/2018


Document Created: 2018-12-27 15:24:26
Document Modified: 2018-12-27 15:24:26
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