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 15 of 171
8.7 Device Holder
<Device Holder for SAM Twin Phantom>
The SAR in the phantom is approximately inversely proportional to the square of the distance between the
source and the liquid surface. For a source at 5 mm distance, a positioning uncertainty of ± 0.5 mm would
produce a SAR uncertainty of ± 20 %. Accurate device positioning is therefore crucial for accurate and
repeatable measurements. The positions in which the devices must be measured are defined by the standards.
The DASY device holder is designed to cope with different positions given in the standard. It has two scales for
the device rotation (with respect to the body axis) and the device inclination (with respect to the line between
the ear reference points). The rotation center for both scales is the ear reference point (ERP).
Thus the device needs no repositioning when changing the angles.
The DASY device holder is constructed of low-low POM material having the following dielectric parameters:
relative permittivity ε = 3 and loss tangent δ = 0.02. The amount of dielectric material has been reduced in the
closest vicinity of the device, since measurements have suggested that the influence of the clamp on the test
results could thus be lowered.
Fig. 8.9 Photo of Device Holder