MPE

FCC ID: 2APU9-391

RF Exposure Info

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FCCID_4234985

RF Exposure evaluation FCC ID: 2APU9-391 According to 447498 D01 General RF Exposure Guidance v06 4.3. General SAR test exclusion guidance 4.3.1. Standalone SAR test exclusion considerations a) For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR, 30 where  f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation31 The result is rounded to one decimal place for comparison The values 3.0 and 7.5 are referred to as numeric thresholds in step b) below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm, and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 4.1 f) is applied to determine SAR test exclusion. 30 This is equivalent to the formula written as: [(max. power of channel, including tune-up tolerance, mW)/(60/√f(GHz) mW)]·[20 mm/(min. test separation distance, mm)] ≤ 1.0 for 1-g SAR; also see Appendix A for approximate exclusion threshold numerical values at selected frequencies and distances. eirp = pt x gt = (EXd)2/30 where: pt = transmitter output power in watts, gt = numeric gain of the transmitting antenna (unitless), E = electric field strength in V/m, --- 10((dBuV/m)/20)/106 d = measurement distance in meters (m)---3m So pt = (EXd)2/30 x gt `

RF Exposure evaluation Copied from the FCC test report: clause 9.4 Maximum Peak Output Power Test Result: For BLE: Frequency Reading Output Power Limit Test Mode MHz dBm mW mW 2402 0.80 1.20 1000 GFSK(BLE) 2442 0.76 1.19 1000 2480 -2.84 0.52 1000 Note: the antenna gain of 0dB less than 6dBi maximum permission antenna gain value based on 1 watt peak output power limit. Then we choose Normal mode channel as the worst case of Maximum Peak Output Power: Frequency Reading Output Power Limit Test Mode MHz dBm mW mW 2402 0.80 1.20 1000 GFSK(BLE) 2442 0.76 1.19 1000 2480 -2.84 0.52 1000 EIRP/ dBm= Conducted Max Output Power/ dBm+ Antenna gain /dBi. General RF Exposure: (1.20mW )/5.0mm)x √2.402 GHz = 0.37 (1.19mW )/5.0mm)x √2.442 GHz = 0.37 (0.52mW )/5.0mm)x √2.480 GHz = 0.16 SAR requirement: S=3.0 General RF Exposure<3 Then SAR evaluation is not required `


Document Created: 2019-02-25 14:14:02
Document Modified: 2019-02-25 14:14:02
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