Subclause K.3.4 provides an example using the data of Figure K.1 for the "fast SAR 1"
method. The steps of the procedure of 6.6.4 are followed below. This example illustrates the case of a wireless device having only one frequency band and one transmit mode, and where the fast SAR method uses the same hardware as the full SAR system. The SAR values reported here are 1 g average values, with the applicable SAR limit of 1,6 W/kg applied.
There are twelve test configurations. An example of what would create twelve test conditions is testing at both sides of the head (left and right) in both tilt and cheek positions for a device that has three different battery types.
a) Use the fast SAR method to perform measurements required in 6.4.2 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 band 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.16 shows the results of the fast SAR measurements.
Table K.16 – Measurements conducted according to Step a)
Test condition number
SARfast
low channel middle channel high channel
1 0,570
2 0,565
3 0,901 0,958 0,945
4 1,395 1,403 1,360
5 0,470
6 0,950 0,978 0,948
7 0,789
8 1,280 1,320 1,200
9 0,586
10 0,593
11 0,980 1,125 1,090
12 0,892 0,915 0,899
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 as 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 as SARmax,fulli. Select the maximum value among the N test configurations, SARmax,full= max(SARmax,fulli).
There is only N = 1 frequency band and modulation and SARmax,fast1 = 1,403 W/kg. This value is shown in bold in Table K.17. The same test configuration is measured using the full SAR method, and a value of SARmax,full1 = 1,22 W/kg was found, as shown in Table K.17. Since N = 1, SARmax,full = SARmax,full1 = 1,22 W/kg.
Table K.17 – Measurements conducted according to Step b)
Test condition
number
SARfast SARfull
low channel middle
channel high channel low channel middle
channel high channel
1 0,570
2 0,565
3 0,901 0,958 0,945
4 1,395 1,403 1,360 1,22
5 0,470
6 0,950 0,978 0,948
7 0,789
8 1,280 1,320 1,200
9 0,586
10 0,593
11 0,980 1,125 1,090
12 0,892 0,915 0,899
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.
It is assumed that the relative standard uncertainty is Ufast = 5 % (k = 1). Using Formula (11), with Ufasti = 5 %, Bfasti is calculated as 1,006 8. From Formula (15),
890 , 0
2 1
fast
fast − B − =
B . As discussed in the beginning of this subclause,
the SAR limit in this case is 1,6 W/kg, so all test configurations where SARfasti ≥ 1,60 W/kg × 0,890 = 1,42 W/kg should be measured with the full SAR method.
There are no test configurations, which satisfy this condition, as shown in below. So this step involves no full SAR measurement, shown in Table K.18 below.
Table K.18 – Measurements conducted according to Step c)
Test condition
number
SARfast SARfull
low channel middle
channel high channel low channel middle
channel high channel
1 0,570
2 0,565
3 0,901 0,958 0,945
4 1,395 1,403 1,360 1,22
5 0,470
6 0,950 0,978 0,948
7 0,789
8 1,280 1,320 1,200
9 0,586
10 0,593
11 0,980 1,125 1,090
12 0,892 0,915 0,899
d) For all the full SAR measurements conducted in Steps b) and c), calculate and record Ri,j
according to Formula (16). For any Ri,j ≥ Ufasti, perform full SAR measurements for the other test condition 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.
In this example R1,4 is 0,15 (15 %), which is higher than fast SAR uncertainty 5 %.
Therefore, full SAR measurements are required for all other test configurations on the channel having the highest fast SAR result. See Table K.19 for measurement results.
Table K.19 – Measurements conducted according to Step e)
Test condition
number
SARfast SARfull
channel low middle
channel high channel low
channel middle
channel high
channel R
1 0,570 0,553 0,03
2 0,565 0,548 0,03
3 0,901 0,958 0,945 0,708 0,35
4 1,395 1,403 1,360 1,22 0,15
5 0,470 0,450 0,04
6 0,950 0,978 0,948 0,767 0,28
7 0,789 0,763 0,03
8 1,280 1,320 1,200 0,820 0,61
9 0,586 0,569 0,03
10 0,593 0,578 0,03
11 0,980 1,125 1,090 0,780 0,44
12 0,892 0,915 0,899 0,690 0,32
e) For any 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.
New R values are calculated for full SAR measurements conducted in Step d). In two cases middle channel SARfull > 0,8 W/kg and Ri,j > 0,05. Therefore, new full SAR measurements are needed for the additional channels. See Table K.20.
Table K.20 – Measurements conducted according to Step f)
Test condition
number
SARfast SARfull
channel low middle
channel high
channel low
channel middle
channel high
channel R
1 0,570 0,553 0,03
2 0,565 0,548 0,03
3 0,901 0,958 0,945 0,708 0,35
4 1,395 1,403 1,360 1,14 1,22 1,21 0,15
5 0,470 0,450 0,04
6 0,950 0,978 0,948 0,767 0,28
7 0,789 0,763 0,03
8 1,280 1,320 1,200 0,734 0,820 0,777 0,61
9 0,586 0,569 0,03
10 0,593 0,578 0,03
11 0,980 1,125 1,090 0,780 0,44
12 0,892 0,915 0,899 0,690 0,32
f) From the full SAR measurements that have been measured in Steps b), c), d) and e) denoted as 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.
For this example, 24 fast SAR tests were performed and 16 full SAR tests. If fast SAR testing had not been applied, sixteen full SAR tests would have been required (twelve test configurations plus low and high channels for two of the test configurations).