03 FCC RF Exposure_DSS

FCC ID: AK8WF1000XM3

RF Exposure Info

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FCCID_4216174

Sony Global Manufacturing & Operations Corporation EMC/RF Test Laboratory, Main Lab.
Kisarazu Site 8-4 Shiomi Kisarazu-shi, Chiba, 292-0834 Japan

Date: March 25, 2019
FCC ID : AK8WF1000XM3
Applicant : Sony Corporation

SAR Evaluation Exemption

To whom it may concern,

We, Sony Global Manufacturing & Operations Corporation EMC/RF Test Laboratory, Main
Lab., hereby declare that Wireless Noise Canceling Headset, models: WF-1000XM3R,
WF-1000XM3L (FCC ID: AK8WF1000XM3) of Sony Corporation are exempt from RF
exposure SAR evaluation, as their output power meet the exclusion limits, stated in FCC
Part 2 §2.1093.

According to KDB 447498 D01 (v06), section 4.3.1:
… These test exclusion conditions are based on source-based time-averaged (i.e. frame averaged)
maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up
tolerance, and the minimum test separation distance required for the exposure conditions.
… The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances
≤ 50 mm are determined by:
[(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, where
• f(GHz) is the RF channel transmit frequency in GHz
• Power and distance are rounded to the nearest mW and mm before calculation
• The result is rounded to one decimal place for comparison
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 is applied to determine SAR test exclusion.

For above device,
Regarding Bluetooth BR/EDR;
f = 2.48 GHz, distance = 5mm (the min. separation distance is < 5 mm),
the max. possible duty cycle = 83.3% = -0.79 dB,
(* xDH5: 83.3% = (On time; 625 μs * 5 slots) / (On time + Off time; 625 μs * 6 slots) )
the max. possible burst averaged power incl. tune-up tolerance = 9.50 dBm, and
the max. possible frame averaged power incl. tune-up tolerance = 9.50 + (-0.79) = 8.71 dBm ≈ 7 mW.
Therefore,
7 mW / 5 mm * ( √ 2.48 GHz) = 2.2 < 3.0
and no SAR evaluation is required.

Regarding Bluetooth Low Energy;
f = 2.48 GHz, distance = 5mm (the min. separation distance is < 5 mm),
the max. possible duty cycle = 100% = 0.00 dB,
the max. possible burst averaged power incl. tune-up tolerance = 2.90 dBm, and
the max. possible frame averaged power incl. tune-up tolerance = 2.90 + (0.00) = 2.90 dBm ≈ 2 mW.
Therefore,
2 mW / 5 mm * ( √ 2.48 GHz) = 0.6 < 3.0
and no SAR evaluation is required.

Document Created: 2019-03-25 14:42:33
Document Modified: 2019-03-25 14:42:33

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