RF Exposure Evaluation Method
FCC ID: 2AQI5-LP452
Testing Laboratory: BCTC (倍测检测)
Applicable Standard
This device has been defined as a portable device in accordance with FCC 47 CFR part 2 (2.1093). A portable device is defined as a transmitting device designed to be used such that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user.
Portable devices must be evaluated using the specified methods in FCC 47 CFR part 2 (2.1093) and ANSI/IEEE C95.1-1992, and had been tested in accordance with the measurement methods and procedures specified in IEEE 1528-2003.
SAR Test Exclusion Thresholds
Per FCC KDB 447498 D01 v06, 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 the following:
SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm
Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following table:
| MHz | 5 mm | 10 mm | 15 mm | 20 mm | 25 mm |
|---|---|---|---|---|---|
| 150 | 39 | 77 | 116 | 155 | 194 |
| 300 | 27 | 55 | 82 | 110 | 137 |
| 450 | 22 | 45 | 67 | 89 | 112 |
| 835 | 16 | 33 | 49 | 66 | 82 |
| 900 | 16 | 32 | 47 | 63 | 79 |
| 1500 | 12 | 24 | 37 | 49 | 61 |
| 1900 | 11 | 22 | 33 | 44 | 54 |
| 2450 | 10 | 19 | 29 | 38 | 48 |
| 3600 | 8 | 16 | 24 | 32 | 40 |
| 5200 | 7 | 13 | 20 | 26 | 33 |
| 5400 | 6 | 13 | 19 | 26 | 32 |
| 5800 | 6 | 12 | 19 | 25 | 31 |
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.
BLE RF Exposure Evaluation
The following table shows the conducted power for BLE modes:
| Mode | Frequency (MHz) | Conducted Power (dBm) | Limit (dBm) | Verdict |
|---|---|---|---|---|
| GFSK 1Mbps | 2402 | -0.15 | 30 | Pass |
| GFSK 1Mbps | 2440 | 0.45 | 30 | Pass |
| GFSK 1Mbps | 2480 | 0.52 | 30 | Pass |
| GFSK 2Mbps | 2402 | -0.14 | 30 | Pass |
| GFSK 2Mbps | 2440 | 0.56 | 30 | Pass |
| GFSK 2Mbps | 2480 | 0.58 | 30 | Pass |
Maximum possible output power (PK, conducted): 1 ± 1 dBm.
Note: -0.5dBi logarithmic terms convert to numeric result is nearly 0.891. 2dBm = 1.58mW.
Calculations for SAR Test Exclusion
2402MHz:
[(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] * [√f(GHz)] = 1.58 / 5 * √2.402 = 0.49 ≤ 3.0
2440MHz:
[(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] * [√f(GHz)] = 1.58 / 5 * √2.44 = 0.50 ≤ 3.0
2480MHz:
[(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] * [√f(GHz)] = 1.58 / 5 * √2.48 = 0.50 ≤ 3.0
Conclusion
- The calculated value [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] * [√f(GHz)] is less than 3.0 for all tested frequencies.
- The SAR Test Exclusion Threshold is 3.0 for a separation distance of 5mm. Therefore, SAR testing is not required for this device.
