Product Info

Report No: CCISE191202301-V01
Shenzhen Zhongjian Nanfang Testing Co., Ltd. Project No.: CCISE1912023
No. B-C, 1/F., Building 2, Laodong No.2 Industrial Park, Xixiang Road,
Bao’an District, Shenzhen, Guangdong, China
Telephone: [phone] Fax: [phone], E-mail: [e-mail] Page 30 of 171
12.4 Volume Scan Procedures
The volume scan is used for assess overlapping SAR distributions for antennas transmitting in different
frequency bands. It is equivalent to an oversized zoom scan used in standalone measurements. The
measurement volume will be used to enclose all the simultaneous transmitting antennas. For antennas
transmitting simultaneously in different frequency bands, the volume scan is measured separately in each
frequency band. In order to sum correctly to compute the 1g aggregate SAR, the EUT remain in the same test
position for all measurements and all volume scan use the same spatial resolution and grid spacing. When all
volume scan were completed, the software, SEMCAD post-processor scan combine and subsequently
superpose these measurement data to calculating the multiband SAR.
12.5 SAR Averaged Methods
In DASY, the interpolation and extrapolation are both based on the modified Quadratic Shepard’s method. The
interpolation scheme combines a least-square fitted function method and a weighted average method which are
the two basic types of computational interpolation and approximation.
Extrapolation routines are used to obtain SAR values between the lowest measurement points and the inner
phantom surface. The extrapolation distance is determined by the surface detection distance and the probe
sensor offset. The uncertainty increases with the extrapolation distance. To keep the uncertainty within 1% for
the 1g and 10g cubes, the extrapolation distance should not be larger than 5 mm.
12.6 Power Drift Monitoring
All SAR testing is under the EUT install full charged battery and transmit maximum output power. In DASY
measurement software, the power reference measurement and power drift measurement procedures are used
for monitoring the power drift of EUT during SAR test. Both these procedures measure the field at a specified
reference position before and after the SAR testing. The software will calculate the field difference in dB. If the
power drifts more than 5%, the SAR will be retested.