System Description

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Page
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Issued Date
:
Feb. 14, 2020
Form version: 181113
FCC SAR TEST REPORT
Report No. : FA9O2119
10.2 Definition of the cheek position
1. Ready the handset for talk operation, if necessary. For example, for handsets with a cover piece (flip cover), open the
cover. If the handset can transmit with the cover closed, both configurations must be tested.
2. Define two imaginary lines on the handset—the vertical centerline and the horizontal line. The vertical centerline
passes through two points on the front side of the handset—the midpoint of the width wt of the handset at the level of
the acoustic output (point A in Figure 9.2.1 and Figure 9.2.2), and the midpoint of the width wb of the bottom of the
handset (point B). The horizontal line is perpendicular to the vertical centerline and passes through the center of the
acoustic output (see Figure 9.2.1). The two lines intersect at point A. Note that for many handsets, point A coincides
with the center of the acoustic output; however, the acoustic output may be located elsewhere on the horizontal line.
Also note that the vertical centerline is not necessarily parallel to the front face of the handset (see Figure 9.2.2),
especially for clamshell handsets, handsets with flip covers, and other irregularly-shaped handsets.
3. Position the handset close to the surface of the phantom such that point A is on the (virtual) extension of the line
passing through points RE and LE on the phantom (see Figure 9.2.3), such that the plane defined by the vertical
centerline and the horizontal line of the handset is approximately parallel to the sagittal plane of the phantom.
4. Translate the handset towards the phantom along the line passing through RE and LE until handset point A touches
the pinna at the ERP.
5. While maintaining the handset in this plane, rotate it around the LE-RE line until the vertical centerline is in the plane
normal to the plane containing B-M and N-F lines, i.e., the Reference Plane.
6. Rotate the handset around the vertical centerline until the handset (horizontal line) is parallel to the N-F line.
7. While maintaining the vertical centerline in the Reference Plane, keeping point A on the line passing through RE and
LE, and maintaining the handset contact with the pinna, rotate the handset about the N-F line until any point on the
handset is in contact with a phantom point below the pinna on the cheek. See Figure 9.2.3. The actual rotation angles
should be documented in the test report.
Fig 9.2.1 Handset vertical and horizontal
reference lines—“fixed case
Fig 9.2.2 Handset vertical and horizontal reference
lines—“clam-shell case”
Fig 9.2.3 cheek or touch position. The reference points for the right ear (RE), left ear (LE), and mouth (M), which
establish the Reference Plane for handset positioning, are indicated.