The SAR values are generated using a random number generator, similarly to the SAR values reported in K.3.3. The steps of the procedure of 6.6.4 are followed below. There are eight test configurations per frequency band. An example of what would create eight test conditions is testing at both sides of the head (left and right) in both tilt and cheek positions for a device that has two different battery types.
a) Use the fast SAR method to perform measurements required in 6.3 on all available test configurations, unless they are excluded from testing by this Standard or by applicable national regulations. This includes ensuring that the requirements of 6.3, Step 2) are met regarding testing of all required frequencies across the applicable frequency bands using the procedure of 6.6.3. The test configurations should be grouped separately per the N different frequency bands and modulations evaluated.
Table K.21 shows the results of the fast SAR measurements.
Table K.21 – Fast SAR measurements conducted according to Step a)
Test condition
number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 0,961 1,046 1,294 - 0,535 - - 0,498 -
2 - 0,752 - - 0,774 - - 0,480 -
3 - 0,962 - 1,258 1,078 0,630 0,767 0,576 0,499
4 - 0,662 - - 0,672 - - 0,335 -
5 - 0,704 - 0,883 1,252 0,861 - 0,559 -
6 1,130 1,519 1,519 - 0,717 - - 0,321 -
7 - 0,831 - - 0,952 - - 0,434 -
8 1,063 1,183 1,536 - 0,575 - - 0,433 -
b) For each of the N frequency bands and modulations evaluated in Step a), find the test configuration having the highest SAR value measured by the fast SAR technique, denoted SARmax,fasti (i = 1 to N). Use the full SAR method (according to the procedure in 6.4.2) to measure each of the N test configurations identified in this step, denoted SARmax,fulli. Select the maximum value among the N test configurations, SARmax,full = max(SARmax,fulli).
There are N = 3 frequency bands. The highest SAR configurations for the N = 3 frequency bands are SARmax,fast1 = 1,536 W/kg, SARmax,fast2 = 1,258 W/kg and SARmax,fast3 = 0,767 W/kg, as shown in Table K.21. The measured values of SARmax,fulli for i = 1, 2 and 3 are shown in Table K.22. SARmax,full = max(1,662 W/kg, 1,530 W/kg, 0,815 W/kg) = 1,662 W/kg.
Table K.22 – Full SAR measurements conducted according to Step b)
Test condition
number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 2
3 1,530 0,815
4 5 6 7
8 1,662
c) For all of the N groups of frequency bands and modulations defined in Step a), use the full SAR method (according to the procedure in 6.4.2) to measure all other test configurations {i,j} (j = 1 to M, where M is the number of fast SAR test configurations in the i-th group) at the channel giving highest fast SAR result if the condition of Formula (15) is met. Bfasti is calculated according to Formula (11). Ufasti in Formula (11) is the measurement uncertainty of the fast SAR measurements according to 7.4, corresponding to the standard uncertainty (k = 1) from the uncertainty budget of Table 14.
Using Formula (11), with Ufast = 10 %, Bfast is calculated as 1,027 6. From Formula (15), 791
, 0
2 1
fast
fast − B − =
B . As the SAR limit in this example is 2,0 W/kg, all test configurations where SARfasti ≥ 2,0 W/kg × 0,791 = 1,582 W/kg should be measured with the full SAR method. There are no test configurations which satisfy this condition. This step therefore does not involve full SAR measurements.
d) For all the full SAR measurements conducted in Steps b) and c), calculate and record Formula (16).
Ri,j for Band 1 is 0,076, for Band 2 is 0,178 and for Band 3 is 0,059.
For any Ri,j ≥ Ufasti, , perform full SAR measurements for the other test conditions in that frequency band and modulation {i}, provided the following is observed: the test channel for each test condition should be the channel having the highest fast SAR result for that test condition (the test channel may differ for each condition). The fast SAR result should be remeasured with full SAR, unless a full SAR measurement has already been performed in a previous step. Note that some test conditions may only have one fast SAR result available, which should be interpreted as the highest result.
Ri,j is higher than fast SAR uncertainty 10 % in this example for test result in Band 2. For i = 2, all test conditions shall be tested with the full SAR system for the channel having the highest fast SAR result. Therefore, seven additional full SAR tests are needed, with the results shown in Table K.23.
Table K.23 – Full SAR measurements conducted according to Step e)
Test condition
number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 - 0,728
2 - 0,952
3 1,530 0,815
4 0,884
5 1,342
6 - 0,899
7 1,053
8 1,662 0,774
e) If Ri,j ≥ Ufasti for any of the measurements conducted in Steps b) to d) where SARfull is within 3 dB of the applicable SAR limit, perform full SAR measurements for the remaining required test channels in 6.2.5 for the frequency band/modulation and test position combination {i,j}. In addition, for all remaining test configurations where Ri,j < Ufasti and
SARfull is within 3 dB of the applicable SAR limit, measure the SAR at all of the required
test channels using either a fast SAR or full SAR method. If fast SAR method is used, Steps c) and d) shall be repeated for the new fast SAR value(s) to ensure all necessary full SAR measurements are conducted
The Ri,j values need to be calculated for Band 2 test configuration numbers 5 and 7, since these have a middle channel value higher than 1,0 W/kg (50 % of the SAR limit).
R2,3 = 0,178, R2,5 = 0,067 and R2,7 = 0,096, therefore only R2,3 is higher than the fast SAR uncertainty of 10 % in this example. For this test configuration full SAR is required for other required test channels. Also for test configuration 5 and 7, other required test channels are required to be measured. For test configuration 5 this is already done with fast SAR in Step a) showing that the middle channel gives the highest SAR value. For configuration 7, SAR measurements are needed for the required edge channels. Either fast or full SAR measurements would be applicable. In this example, full SAR measurements are conducted. See Table K.24 for full SAR measurements conducted in Step e).
Table K.24 – Full SAR measurements conducted according to Step e)
Test condition
number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 - 0,728
2 - 0,952
3 1,530 1,201 0,973 0,815
4 0,884
5 1,342
6 - 1,573 0,899
7 0,983 1,053 0,895
8 1,662 0,774
f) From the full SAR measurements that have been measured in Steps b), c), e) and f) denoted SARfulli,j, choose the highest value, SARhighest,full = max(SARfulli,j), which includes all test configurations in the i-th group, for all the N different frequency bands and modulations evaluated.
The highest SAR value for this example is 1,662. Fourteen full SAR tests were performed. If fast SAR testing had not been applied, 36 full SAR tests would have been required for the centre frequency alone. With low and high channel testing requirements of 6.2.5, additional full SAR tests would also have been required if fast SAR had not been applied.
Annex L (informative)
SAR test reduction supporting information