80-7764-00 1.9GHz Cordless Phone with Bluetooth RF Exposure Info TS10110093-EME_SAR_TL92271 VTech Telecommunications Ltd

VTech Telecommunications Ltd 1.9GHz Cordless Phone with Bluetooth

Alternate Views: Download [PDF]
Report No.: TS10110093-EME
Page 1 of 67
Specific Absorption Rate (SAR) Test Report
for
VTech Telecommunications Ltd.
on the
1.9GHz DECT 6.0 Handset
Model Number: TL92271
Test Report: TS10110093-EME
Date of Report: Nov. 26, 2010
Date of test: Nov. 25, 2010
Review Date: Nov. 26, 2010
Total No of Pages Contained in this Report: 67
The test report was prepared by:
Sign on File
Julie Wang / Assistant
These measurements were taken by:
Sign on File
Fred Yu / Engineer
The test report was reviewed by:
Name Rex Liao
Title Engineer
All services undertaken are subject to the following general policy: Reports are submitted for
exclusive use of the client to whom they are addressed. Their significance is subject to the
adequacy and representative character of the samples and to the comprehensiveness of the
tests, examinations or surveys made. This report shall not be reproduced except in full,
without written consent of Intertek Testing Services, Taiwan Ltd.
0597
Report No.: TS10110093-EME
Page 2 of 67
Table of Contents
1.0 General information ......................................................................................3
2.0 SAR Evaluation.............................................................................................7
3.0 Test Instruments and Tissue Liquids ...........................................................17
4.0 Measurement Uncertainty...........................................................................21
5.0 Test Results ................................................................................................23
6.0 E-Field Probe and 1900 Dipole Antenna Calibration...................................24
7.0 WARNING LABEL INFORMATION - USA ..................................................24
8.0 REFERENCES ...........................................................................................24
9.0 DOCUMENT HISTORY ..............................................................................25
APPENDIX A - SAR Evaluation Data................................................................26
APPENDIX B - Photographs.............................................................................35
APPENDIX C - E-Field Probe and 1900MHz Dipole Antenna Calibration Data 39
Report No.: TS10110093-EME
Page 3 of 67
1.0 General information
The TL92271 handset supplied for Specific Absorption Rate (SAR) testing is a 1.9GHz DECT 6.0
Handset.
The device was tested at the facility of Intertek Testing Services in Hsinchu, Taiwan. The maximum
output power declared by VTech Telecommunications Ltd.
EUT model # TL92271 was evaluated in accordance with the requirements for compliance testing
defined in FCC OET Bulletin 65 Supplement C (Edition 01-01), RSS-102 and meet the SAR
requirement.
For the evaluation, the dosimetric assessment system INDEXSAR SARA2 was used. The phantom
employed was the head Specific Anthropomorphic Mannequin (SAM) phantom. The total
uncertainty for the evaluation of the spatial peak SAR values averaged over a cube of 1g tissue
mass had been assessed for this system to be ±20.6%.
SAR testing was performed at both the left and right ear of the phantom at the two-handset positions
stated in the specification. Testing was performed at the middle frequency of 1900 band with a
rechargeable battery and in Normal mode of operation.
Any accessories supplied with TL92271 have also been tested.
In summary, the maximum spatial peak SAR value for the sample device averaged over 1g was
found to be:
Phantom Worst Case Position SAR1g, W/kg
Head Specific
Anthropomorphic
Mannequin (SAM)
phantom
EUT Left Cheek to the
phantom 0.011 W/kg
In conclusion, the tested Sample device was found to be in compliance with the requirements
defined in OET Bulletin 65 Supplement C (Edition 01-01) and RSS-102 for head configurations.
Report No.: TS10110093-EME
Page 4 of 67
1.1 Client Information
The 1.9GHz DECT 6.0 Handset has been tested at the request of:
Applicant: VTech Telecommunications Ltd.
23/F., Tai Ping Industrial Centre, Block 1, 57 Ting Kok Road, Tai Po, Hong Kong
1.2 Equipment under test (EUT)
Product Descriptions:
Equipment 1.9GHz DECT 6.0 Handset
Trade Name AT&T Model No. TL92271
FCC ID EW780-7764-00 S/N No. Not Labeled
Category Portable RF
Exposure
Uncontrolled Environment
Frequency Band 1921.536 -1928.448 MHz System /
Power Level
DECT
Type Integral Configuration Fixed
Dimensions 42 mm length Gain 0 dBi
Location Embedded
Use of product: 1.9GHz DECT 6.0 Handset
Manufacturer: Dongguan VTech Satellite Equipment Co. Ltd.
Production is planned: [X] Yes, [ ] No
EUT receive date: Nov. 24, 2010
EUT received condition: Good operating condition prototype
EUT status: Normal mode
Test start date: Nov. 25, 2010
Test end date: Nov. 25, 2010
Report No.: TS10110093-EME
Page 5 of 67
1.3 Modifications required for compliance
The EUT has no modifications during test.
1.4 System test configuration
1.4.1 System block diagram & Support equipment
Support Equipment
Item
# Equipment Model No. S/N
1 Base unit TL92271 N/A
Report No.: TS10110093-EME
Page 6 of 67
1.4.2 Test Position
See the photographs as section 2.2
1.4.3 Test Condition
During tests the worst-case data (max RF coupling) was determined with following conditions:
Usage
Operated in normal
mode with Base unit
which provided by
client
Distance between
antenna axis at the
joint and the liquid
surface:
Handset is touching and
tilting the Head Phantom in
right and left position
Simulating human
Head / Body Head EUT Battery Fully-charged with 1 set
rechargeable battery
Channel Frequency
MHz
Before
SAR Test
(dBm)
After
SAR Test
(dBm)
Conducted output
power
Mid Channel 1924.992 20.26 20.25
The spatial peak SAR values were assessed for middle operating channel, defined by the
manufacturer.
Report No.: TS10110093-EME
Page 7 of 67
2.0 SAR Evaluation
2.1 SAR Limits
The following FCC limits (IEEE C95.1 2005) for SAR apply to devices operate in General
Population/Uncontrolled Exposure environment:
EXPOSURE
(General Population/Uncontrolled Exposure environment)
SAR
(W/kg)
Average over the whole body 0.08
Spatial Peak (1g) 1.60
Spatial Peak for hands, wrists, feet and ankles (10g) 4.00
Report No.: TS10110093-EME
Page 8 of 67
2.2 Configuration Photographs
Test System: Head Simulator
Cheek Position of Left Ear
Tilt Position of Left Ear
Report No.: TS10110093-EME
Page 9 of 67
Cheek Position of Right Ear
Tilt Position of Right Ear
Report No.: TS10110093-EME
Page 10 of 67
2.3 SAR measurement system
Robot system specification
The SAR measurement system being used is the IndexSAR SARA2 system, which consists
of a Mitsubishi RV-E2 6-axis robot arm and controller, IndexSAR probe, amplifier and the
phantom with Head or Box Shape. The robot is used to articulate the probe to programmed
positions inside the phantom head to obtain the SAR readings from the DUT.
The system is controlled remotely from a PC, which contains the software to control the robot
and data acquisition equipment. The software also displays the data obtained from test
scans.
Figure 1: Schematic diagram of the SAR measurement system
The position and digitized shape of the phantom heads are made available to the software
for accurate positioning of the probe and reduction of set-up time.
The SAM phantom heads are individually digitized using a Mitutoyo CMM machine to a
precision of 0.02mm. The data is then converted into a shape format for the software,
providing an accurate description of the phantom shell.
In operation, the system first does an area (2D) scan at a fixed depth within the liquid from
the inside wall of the phantom scanning area is greater than the projection of EUT and
antenna. When the maximum SAR point has been found, the system will then carry out a 3D
scan centred at that point to determine volume averaged SAR level. The first 2
measurements points in a direction perpendicular to the surface of the phantom during the
zoom scan and closest to the phantom surface, were only 3.5mm and the probe is kept at
greater than half a diameter
from the surface Probe specification.
IndexSar isotropic immersible SAR probe
Report No.: TS10110093-EME
Page 11 of 67
The probe contains three orthogonal dipole sensors arranged on a triangular prism core,
protected against static charges by PEEK cylindrical enclosure material.
Probe amplifier specification
This amplifier has a time constant of approx. 50μs, which is much faster than the SAR probe
response time. The overall system time constant is therefore that of the probe (<1ms) and
reading sets for all three channels (simultaneously) are returned every 2ms to the PC. The
conversion period is approx. 1 μs at the start of each 2ms period. This enables the probe to
follow pulse modulated signals of periods >>2ms. The PC software applies the linearisation
procedure separately to each reading, so no linearisation corrections for the averaging of
modulated signals are needed in this case. It is important to ensure that the probe reading
frequency and the pulse period are not synchronised and the behaviour with pulses of short
duration in comparison with the measurement interval need additional consideration.
Report No.: TS10110093-EME
Page 12 of 67
2.3.1 SAR measurement procedure
a. SARA2 interpolation and extrapolation schemes
SARA2 software contains support for both 2D cubic B-spline interpolation as well as 3D cubit
B-spline interpolation. Additionally, for extrapolation purposes, a general n-th order
polynomial fitting routine is implemented following a singular value decomposition algorithm
presented in [4]. A 4th order polynomial fit is used by default for data extrapolation, but a
linear-logarithmic fitting function can be selected as an option. The polynomial fitting
procedures have been tested by comparing the fitting coefficients generated by the SARA2
procedures with those obtained using the polynomial fit functions of Microsoft Excel when
applied to the same test input data.
b. Interpolation of 2D area scan
The 2D cubic B-spline interpolation is used after the initial area scan at fixed distance from
the phantom shell wall. The initial scan data are collected with approx. 10mm spatial
resolution and spline interpolation is used to find the location of the local maximum to within
a 1mm resolution for positioning the subsequent 3D scanning.
c. Extrapolation of 3D scan
For the 3D scan, data are collected on a spatially regular 3D grid having (by default) 6.4 mm
steps in the lateral dimensions and 3.5 mm steps in the depth direction (away from the
source). SARA2 enables full control over the selection of alternative steps in all directions.
The digitised shape of the head is available to the SARA2 software, which decides which
points in the 3D array are sufficiently well within the shell wall to be “visited” by the SAR
probe. After the data collection, the data are extrapolated in the depth direction to assign
values to points in the 3D array closer to the shell wall. A notional extrapolation value is also
assigned to the first point outside the shell wall so that subsequent interpolation schemes will
be applicable right up to the shell wall boundary.
d. Interpolation of 3D scan and volume averaging
The procedure used for defining the shape of the volumes used for SAR averaging in the
SARA2 software follow the method of adapting the surface of the “cube” to conform with the
curved inner surface of the phantom (see Appendix D of FCC OET 65 Supplement C). This
is called, here, the conformal scheme.
Report No.: TS10110093-EME
Page 13 of 67
For each row of data in the depth direction, the data are extrapolated and interpolated to less
than 1 mm spacing and average values are calculated from the phantom surface for the row
of data over distances corresponding to the requisite depth for 10g and 1g cubes. This
results in two 2D arrays of data, which are them cubic B-spline interpolated to sub mm lateral
resolution. A search routine then moves an averaging square around through the 2D array
and records the maximum value of corresponding 1g and 10g volume averages. For the
definition of the surface in this procedure, the digitized position of the head shell surface is
used for measurement in head-shaped phantoms. For measurements in rectangular, box
phantom, the distance between the phantom wall and the closest set of grided data points is
entered into the software. For measurements in box-shaped phantoms, this distance is under
the control of the user. The effective distance must be greater than 2.5 mm as this is the tip-
sensor distance and to avoid interface proximity effects, it should be at least 5 mm. A value
of 6 or 8 mm is recommended. This distance is called dbe.
For automated measurements inside the head, the distance can’t be less than 2.5mm, which
is the radius of the probe tip and to avoid interface proximity effects, a minimum clearance
distance of x mm is retained. The actual value of dbe will vary from point to point depending
upon how the spatially-regular 3D grid points fit within the shell. The greatest separation is
when a grid point is just not visited due to the probe tip dimensions. In this case the distance
could be as large as the step-size plus the minimum clearance distance (i.e. with x=5 mm
and a step size of 3.5, dbe will be between 3.5 and 8.5 mm).
The default step size (dstep) used is 3.5 mm, but this is under user-control. The compromise
is with time of scan, so it’s not practical to make it much smaller or scan times become long
and power-drop influences become larger.
The robot positioning system specification for the repeatability of the positioning (dss) is +/-
0.04 mm.
The phantom shell is made by an industrial molding process from the CAD files of the SAM
shape, with both internal and external molds. For upright phantoms, the external shape is
subsequently digitized on a Mitutoyo CMM machine (Euro an ultrasonic sensor indicate that
the shell thickness (dph) away from the eare is 2.0+/- 0.1mm. the ultrasonic measurements
were calibrated using additional mechanical measurements on available cut surfaces of the
phantom shells.
For upright phantom, the alignment is based upon registration of the rotation axis of the
phantom on its 253 mm diameter baseplate bearing and the position of the probe axis when
commanded to go to the axial position. A laser alignment tool is provided (procedure detailed
elsewhere). This enables the registration of the phantom tip (dmis) to be assured to within
approx. 0.2mm. This alignment is done with reference to the actual probe tip after installation
and probe alignment. The rotational positioning of the phantom is variable-offering
advantages for special studies, but locating pins ensure accurate repositioning at the
principal positions (LH and RH ears).
Report No.: TS10110093-EME
Page 14 of 67
2.3.2 SAR measurement system validation
Routine record keeping procedures should be established for tracking the calibration and
performance of SAR measurement system. When SAR measurements are performed, the
entire measurement system should be checked daily within the device transmitting frequency
ranges to verify system accuracy. A flat phantom irradiated by a half-wavelength dipole is
typically used to verify the measurement accuracy of a system. When a radiating source is
not available at the operating frequency range of the test device to verify system accuracy, a
source operating within 100 MHz of the mid-band channel of each operating mode may be
used. The measured one-gram SAR should be within 10% of the expected target values
specified for the specific phantom and RF source used in the system verification
measurement.
Procedures
The SAR evaluation was performed with the following procedures:
a. The SAR distribution was measured at the exposed side of the bottom of the box
phantom and was measured at a distance of 15 mm for 300 ~ 1000 MHz and 10 mm for
1000 ~ 3000 MHz from the inner surface of the shell. The feed power was 1/5W.
b. The dimension for this cube is 32 mm x 32 mm x 34 mm was assessed by measuring 5 x
5 x 7 points. On the basis of this data set, the spatial peak SAR value was evaluated
with the following procedure:
i) The data at the surface were extrapolated, since the center of the dipoles is 2.7 mm
away from the tip of the probe and the distance between the surface and the lowest
measurement point is 5 mm. The extrapolation was based on a least square
algorithm. A polynomial of the fourth order was calculated through the points in Z-
axes. This polynomial was then used to evaluate the points between the surface and
the probe tip.
ii) The maximum interpolated value was searched with a straightforward algorithm.
Around this maximum, the SAR values averaged over the spatial volumes (1g or 10g)
were computed using the 3-D spline interpolation algorithm. The 3-D spline is
composed of three one-dimensional splines with the “Not a knot” condition (in x, y
and z directions). The volume was integrated with the trapezoidal algorithm. 1000
points (10 x 10 x 10) were interpolated to calculate the average.
iii) All neighboring volumes were evaluated until no neighboring volume with a higher
average value was found.
c. Re-measurements of the SAR value at the same location as in step a. above. If the value
changed by more than 5 %, the evaluation was repeated.
d. The test scan procedure for system validation also apply to the general scan procedure
except for the set-up position. For general scan, the EUT was placed at the side of
phantom. For validation scan, the dipole antenna was placed at the bottom of phantom
Report No.: TS10110093-EME
Page 15 of 67
2.3.2.1 System Validation results
System Validation (1900 MHz)
Frequency
MHz
Liquid
Type
Operating
Mode
Target SAR1g
(W/kg)
Measured SAR1g
(W/kg)
Deviation (±10%)
1900 Head CW 39.7* 40.935 3.1108%
* the target was quoted from 1900 dipole antenna calibration report
1900 MHz Head SAR1g ambient measured value: 0.001 (W/kg)
Please see the plot below:
Report No.: TS10110093-EME
Page 16 of 67
Date: 2010/11/25
Position: bottom to phantom
Filename: 1900H validation.txt Phantom: HeadBox1-val..csv
Device Tested: 1900H validation Head Rotation: 0
Antenna: 1900 dipole antenna Test Frequency: 1900 MHz
Shape File: none.csv
Power Level: 23 dBm
Probe: 0136
Cal File: SN0136_1900_HEAD
X Y Z
Air 459 359 382
DCP 20 20 20
Cal Factors:
Lin .369 .369 .369
Batteries
Replaced: 2010/11/25
Liquid: 15.5cm
Type: 1900 MHz Head
Conductivity: 1.3594
Relative Permittivity: 40.3382
Liquid Temp (deg C): 24
Ambient Temp (deg C): 24
Ambient RH (%): 52
Density (kg/m3): 1000
Software Version: 2.54
ZOOM SCAN RESULTS:
Start Scan End Scan
Spot SAR
(W/kg): 0.931 0.931
Change during
Scan (%) -1.83%
Max E-field
(V/m): 62.59
1g 10g
Max SAR (W/kg) 8.187
X Y Z
Location of Max
(mm): 0 0.0 -220.8
Normalized to an input power of 1W
Averaged over 1 cm3 (1g) of tissue
40.935 W/kg
Report No.: TS10110093-EME
Page 17 of 67
3.0 Test Instruments and Tissue Liquids
3.1 Instruments List
The Specific Absorption Rate (SAR) tests were performed with the INDEXSAR SARA2
SYSTEM.
The following major equipment/components were used for the SAR evaluations:
SAR Measurement System
EQUIPMENT SPECIFICATIONS Intertek ID No.
LAST CAL.
DATE
Balanced Validation
Dipole Antenna 1900MHz EC1381-6 12/09/2008
Controller Mitsubishi CR-E116 EP1320-1 N/A
Robot Mitsubishi RV-E2 EP1320-2 N/A
Repeatability: ± 0.04mm; Number of Axes: 6
E-Field Probe IXP-050 EC1356 01/14/2010
Frequency Range: 800 MHz – 3000 MHz
Probe outer diameter: 5.2 mm; Length: 350 mm; Distance between the probe tip
and the dipole center: 2.7 mm
Data Acquisition SARA2 N/A N/A
Processor: Pentium 4; Clock speed: 1.5GHz; OS: Windows XP; I/O: two RS232;
Software: SARA2 ver. 2.54 VPM
Phantom
Upright Head Specific Anthropomorphic
Mannequin (SAM) phantom, 2mm wall
thickness box phantom
N/A N/A
The head and body phantom shell should be made of low-loss dielectric material
with dielectric constant and loss tangent less than 5.0 and 0.05 respectively. The
shell thickness for all regions coupled to the test device and its antenna should be
within 2.0 ± 0.2 mm. The phantom should be filled with the required head or body
equivalent tissue medium to a depth of 15.0 ± 0.5 cm. Body capacity: 168 x 395 x
174 (W x L x D) mm3.
Device holder Material: clear Perspex N/A N/A
Dielectric constant: less than 2.85 above 500MHz
Simulated Tissue Mixture N/A 11/25/2010
Please see section 3.2 for details
RF Power Meter Anritsu 2495A power senor MA2411B EC1411 10/20/2010
Frequency Range: 300 MHz to 40 GHz, -20~+20dBm
Vector Network
Analyzer HP 8753B, HP 85046A EC1375 10/18/2010
300k to 3GHz
Signal Generator R&S SMR27 EC1354 11/14/2008
10M to 27GHz, <120dBuV
Note: The above equipments are within the valid calibration period
Report No.: TS10110093-EME
Page 18 of 67
3.1.1 Device test positions relative to the head
This practice specifies two handset test positions against the head phantom—the “cheek”
position and the “tilt” position. These two test positions are defined in the following
subclauses. The handset should be tested in both positions on left and right sides of the
SAM phantom. If handset construction is such that the handset positioning procedures
described in 3.1.1.1 and 3.1.1.2 to represent normal use conditions cannot be used, e.g.,
some asymmetric handsets, alternative alignment procedures should be adapted with all
details provided in the test report. These alternative procedures should replicate intended
use conditions as closely as possible according to the intent of the procedures described in
this subclause.
3.1.1.1 Definition of the cheek position
The cheek position is established as follows:
a) 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.
b) 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 below
figure), 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 below left figure). 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 right figure), especially for
clamshell handsets, handsets with flip covers, and other irregularly-shaped handsets.
c) 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 the figure as
next page), 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.
d) Translate the handset towards the phantom along the line passing through RE and LE
until handset point A touches the pinna at the ERP.
Report No.: TS10110093-EME
Page 19 of 67
e) 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.
f) Rotate the handset around the vertical centerline until the handset (horizontal line) is
parallel to the N-F line.
g) 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.
3.1.1.2 Definition of the tilt position
The tilt position is established as follows:
a) Repeat steps a) through g) of 3.1.1.1 to place the device in the cheek position.
b) While maintaining the orientation of the handset, move the handset away from the pinna
along the line passing through RE and LE far enough to allow a rotation of the handset away
from the cheek by 15°.
c) Rotate the handset around the horizontal line by 15°.
d) While maintaining the orientation of the handset, move the handset towards the phantom
on the line passing through RE and LE until any part of the handset touches the ear. The tilt
position is obtained when the contact point is on the pinna. See the figure as below. If
contact occurs at any location other than the pinna, e.g., the antenna at the back of the
phantom head, the angle of the handset should be reduced.
In this case, the tilt position is obtained if any point on the handset is in contact with the pinna
and a second point on the handset is in contact with the phantom, e.g., the antenna with the
back of the head.
Report No.: TS10110093-EME
Page 20 of 67
3.2 Tissue Simulating Liquid
The head and body tissue parameters should be used to test operating frequency band of
transmitters. When a transmission band overlaps with one of the target frequencies, the
tissue dielectric parameters of the tissue medium at the middle of a device transmission band
should be within ±5% of the parameters specified at that target frequency.
3.2.1 Brain Tissue Simulating Liquid Recipes
Brain Ingredients Frequency (1900 MHz)
Water 54.9%
Salt 0.18%
DGBE (Dilethylene Glycol Butyl Ether) 44.92%
The dielectric parameters were verified prior to assessment using the HP 85046A dielectric
probe kit and the HP 8753B network Analyzer. The dielectric parameters were:
ε r / Relative Permittivity σ / Conductivity (mho/m) Freq.
(MHz)
Temp.
() measured Target* Δ (±5%) measured Target* Δ (±5%)
ρ **(kg/m3)
1900 24 40.3382 40.0 0.8455 1.3594 1.40 -2.9000 1000
* Target values refer to IEEE 1528 2003 and FCC OET 65 Supplement C
** Worst-case assumption
Report No.: TS10110093-EME
Page 21 of 67
4.0 Measurement Uncertainty
The uncertainty budget has been determined for the INDEXSAR SARA2 measurement
system according to IEEE P1528 documents [3] and is given in the following table. The
extended uncertainty (95% confidence level) was assessed to be 20.6 % for SAR
measurement, and the extended uncertainty (95% confidence level) was assessed to be
20.2 % for system performance check.
Table 1 Exposure Assessment Uncertainty
a b c d e f g h I
Uncertainty Component Sec. Tol. (+/-)
Prob.
Dist.
Divisor
(descrip)
Divisor
(value) c1 (1g) c1 (10g)
Standard
Uncertainty
(%) 1g
Standard
Uncertainty
(%) 10g
(dB) (%)
Measurement System
Probe Calibration E2.1 2.5 N 1 or k 1 1 1 2.50 2.50
Axial Isotropy E2.2 0.25 5.93 5.93 R 3 1.73 0 0 0.00 0.00
Hemispherical Isotropy E2.2 0.45 10.92 10.92 R 3 1.73 1 1 6.30 6.30
Boundary effect E2.3 4 4.00 R 3 1.73 1 1 2.31 2.31
Linearity E2.4 0.04 0.93 0.93 R 3 1.73 1 1 0.53 0.53
System Detection Limits E2.5 1 1.00 R 3 1.73 1 1 0.58 0.58
Readout Electronics E2.6 1 1.00 N 1 or k 1.00 1 1 1.00 1.00
Response time E2.7 0 0.00 R 3 1.73 1 1 0.00 0.00
Integration time E2.8 1.4 1.40 R 3 1.73 1 1 0.81 0.81
RF Ambient Conditions E6.1 3 3.00 R 3 1.73 1 1 1.73 1.73
Probe Positioner Mechanical Tolerance E6.2 0.6 0.60 R 3 1.73 1 1 0.35 0.35
Probe Position wrt. Phantom Shell E6.3 3 3.00 R 3 1.73 1 1 1.73 1.73
SAR Evaluation Algorithms E5 8 8.00 R 3 1.73 1 1 4.62 4.62
Test Sample Related
Test Sample Positioning E4.2 2 2.00 N 1 1.00 1 1 2.00 2.00
Device Holder Uncertainty E4.1 2 2.00 N 1 1.00 1 1 2.00 2.00
Output Power Variation 6.6.2 5 5.00 R 3 1.73 1 1 2.89 2.89
Phantom and Tissue Parameters
Phantom Uncertainty (shape and thickness) E3.1 4 4.00 R 3 1.73 1 1 2.31 2.31
Liquid conductivity (Deviation from target) E3.2 5 5.00 R 3 1.73 0.64 0.43 1.85 1.24
Liquid conductivity (measurement uncert.) E3.3 1.1 1.10 N 1 1.00 0.64 0.43 0.70 0.47
Liquid permittivity (Deviation from target) E3.2 5 5.00 R 3 1.73 0.6 0.49 1.73 1.41
Liquid permittivity (measurement uncert.) E3.3 1.1 1.10 N 1 1.00 0.6 0.49 0.66 0.54
Combined standard uncertainty RSS 10.5 10.3
Expanded uncertainty (95% Confidence Level
)
k=2 20.6 20.3
Report No.: TS10110093-EME
Page 22 of 67
Table 2 System Check (Verification)
a b c d e f g h I
Uncertainty Component Sec. Tol. (+/-)
Prob.
Dist.
Divisor
(descrip)
Divisor
(value) c1 (1g) c1 (10g)
Standard
Uncertainty
(%) 1g
Standard
Uncertainty
(%) 10g
(dB) (%)
Measurement System
Probe Calibration E2.1 2.5 N 1 or k 1 1 1 2.50 2.50
Axial Isotropy E2.2 0.25 5.93 5.93 R 3 1.73 0 0 0.00 0.00
Hemispherical Isotropy E2.2 0.45 10.92 10.92 R 3 1.73 1 1 6.30 6.30
Boundary effect E2.3 4 4.00 R 3 1.73 1 1 2.31 2.31
Linearity E2.4 0.04 0.93 0.93 R
3 1.73 1 1 0.53 0.53
System Detection Limits E2.5 1 1.00 R 3 1.73 1 1 0.58 0.58
Readout Electronics E2.6 1 1.00 N 1 or k 1.00 1 1 1.00 1.00
Response time E2.7 0 0.00 R 3 1.73 1 1 0.00 0.00
Integration time E2.8 1.4 1.40 R 3 1.73 1 1 0.81 0.81
RF Ambient Conditions E6.1 3 3.00 R 3 1.73 1 1 1.73 1.73
Probe Positioner Mechanical Tolerance E6.2 0.6 0.60 R 3 1.73 1 1 0.35 0.35
Probe Position wrt. Phantom Shell E6.3 3 3.00 R 3 1.73 1 1 1.73 1.73
SAR Evaluation Algorithms E5 8 8.00 R 3 1.73 1 1 4.62 4.62
Dipole
Dipole axis to liquid distance 8, E4.2 2 2.00 N 1 1.00 1 1 2.00 2.00
Input power and SAR drift measurement 8, 6.6.2 5 5.00 R 3 1.73 1 1 2.89 2.89
Phantom and Tissue Parameters
Phantom Uncertainty (thickness) E3.1 4 4.00 R 3 1.73 1 1 2.31 2.31
Liquid conductivity (Deviation from target) E3.2 5 5.00 R 3 1.73 0.64 0.43 1.85 1.24
Liquid conductivity (measurement uncert.) E3.3 1.1 1.10 N 1 1.00 0.64 0.43 0.70 0.47
Liquid permittivity (Deviation from target) E3.2 5 5.00 R 3 1.73 0.6 0.49 1.73 1.41
Liquid permittivity (measurement uncert.) E3.3 1.1 1.10 N 1 1.00 0.6 0.49 0.66 0.54
Combined standard uncertainty RSS 10.3 10.1
Expanded uncertainty (95% Confidence Level) k=2 20.2 19.9
Report No.: TS10110093-EME
Page 23 of 67
5.0 Test Results
The results on the following page(s) were obtained when the device was tested in the
condition described in this report. Detailed measurement data and plots, which reveal
information about the location of the maximum SAR with respect to the device, are reported
in Appendix A.
Measurement Results
Trade Name: AT&T Model No.: TL92271
Serial No.: Not Labeled Test Engineer: Fred Yu
TEST CONDITIONS
Ambient Temperature 24 oC Relative Humidity 52 %
Test Signal Source Normal Mode Signal Modulation DECT
Conducted Power
Before SAR Test
See 1.4.3 of this
report
Conducted Power After
SAR Test
See 1.4.3 of this
report
Test Duration 23 min. each
scan Number of Battery Change
Fully charged with 1
set rechargeable
battery
EUT Position
Channel
(MHz)
Operating
Mode Description
Phantom Degree or
Distance from
phantom
Measured
SAR1g
(W/kg)
Plot
Number
Middle DECT Right cheek 180° 0.010 1
Middle DECT Right tilt 180° 0.006 2
Middle DECT Left cheek 0.011 3
Middle DECT Left tilt 0.006 4
Report No.: TS10110093-EME
Page 24 of 67
6.0 E-Field Probe and 1900 Dipole Antenna Calibration
Probe calibration factors and dipole antenna calibration are included in Appendix C.
7.0 WARNING LABEL INFORMATION - USA
See user manual.
8.0 REFERENCES
[1] ANSI, ANSI/IEEE C95.1-2005: IEEE Standard for Safety Levels with Respect to Human
Exposure to Radio Frequency Electromagnetic Fields, 3kHz to 300 GHz
[2] Federal Communications Commission, “Evaluating Compliance with FCC Guidelines for
Human Exposure to Radiofrequency Electromagnetic Fields”, Supplement C (Edition 01-
01) to OET Bulletin 65 (Edition 97-01)
[3] IEEE Standards Coordinating Committee 34, ”IEEE Recommended Practice for
Determining the Peak Spatial-Average Specific Absorption Rate (SAR) in the Human
Head from Wireless Communications Devices: Measurement Techniques”, IEEE Std
1528TM-2003
[4] Industry Canada, “Radio Frequency Exposure Compliance of Radiocommunication
Apparatus (All Frequency Bands)”, Radio Standards Specification RSS-102 Issue 4:
March 2010.
[5] IEC 62209-1 Human exposure to radio frequency fields from gand-held and body-
mounted wireless communication devices – Human models, instrumentation, and
procedures – Part 1: Procedure to determine the specific absorption rate (SAR) for hand-
held devices used in close proximity to the ear (
frequency range of 300MHz to 3GHz)
Report No.: TS10110093-EME
Page 25 of 67
9.0 DOCUMENT HISTORY
Revision/
Job Number
Writer
Initials Date Change
TS10110093-EME J.W. Nov. 26, 2010 Original document
Report No.: TS10110093-EME
Page 26 of 67
APPENDIX A - SAR Evaluation Data
Power drift is the measurement of power drift of the device over one complete SAR scan.
To assess the drift of the power of the device under test, a SAR measurement
was made in the middle of the zoom scan volume at the start of the scan and a
measurement at this point was then also made after the measurement scan. The
difference between the two measurements should be less than +/-5%.
Report No.: TS10110093-EME
Page 27 of 67
Plot #1 (1/2)
Date: 2010/11/25
Position: Right Cheek
Filename: TL92271-RC.txt
Phantom: HeadFT06.csv
Device Tested: TL92271
Head Rotation: 180
Antenna: Integral
Test Frequency: 1924.992 MHz
Shape File: TL92271 front.csv Power Level: 20.26 dBm
Probe: 0136
Cal File: SN0136_1900_HEAD
X Y Z
Air 459 359 382
DCP 20 20 20
Cal Factors:
Lin .369 .369 .369
Batteries
Replaced: 2010/11/25
Liquid: 15.5 cm
Type: 1900 MHz Head
Conductivity: 1.3594
Relative Permittivity: 40.3382
Liquid Temp (deg C): 24
Ambient Temp (deg C): 24
Ambient RH (%): 52
Density (kg/m3): 1000
Software Version: 2.54
ZOOM SCAN RESULTS:
Start Scan End Scan
Spot SAR (W/kg): 0.003 0.003
Change during
Scan (%) -1.85
Max spot SAR (W/kg): 0.011
1g 10g
Max SAR (W/kg) 0.010 0.006
X Y Z
Location of Max
(mm): 74.4 0.0 -129.0
Report No.: TS10110093-EME
Page 28 of 67
Plot #1 (2/2)
X-axis Scan
Y=16mm , Z= -123.667mm
0
0.002
0.004
0.006
0.008
0.01
0.012
40.08833
43.488 33
46.888 33
50.288 33
53.688 33
57.088 33
60.48833
63.88833
67.28833
70.68833
74.088 33
X (mm)
SAR (W/kg)
Note: X-axis scan of indexSAR is equal to Z-axis scan required.
AREA SCAN:
Min Max Steps
Y-30.0 60.0 9.0
Scan Extent:
Z-180.0 -100.0 8.0
Report No.: TS10110093-EME
Page 29 of 67
Plot #2 (1/2)
Plot #2 (2/2)
Date: 2010/11/25
Position: Right Tilt
Filename: TL92271-RT.txt
Phantom: HeadFT06.csv
Device Tested: TL92271
Head Rotation: 180
Antenna: Integral
Test Frequency: 1924.992 MHz
Shape File: TL92271 front.csv Power Level: 20.26 dBm
Probe: 0136
Cal File: SN0136_1900_HEAD
X Y Z
Air 459 359 382
DCP 20 20 20
Cal Factors:
Lin .369 .369 .369
Batteries
Replaced: 2010/11/25
Liquid: 15.5 cm
Type: 1900 MHz Head
Conductivity: 1.3594
Relative Permittivity: 40.3382
Liquid Temp (deg C): 24
Ambient Temp (deg C): 24
Ambient RH (%): 52
Density (kg/m3): 1000
Software Version: 2.54
ZOOM SCAN RESULTS:
Start Scan End Scan
Spot SAR (W/kg): 0.002 0.001
Change during
Scan (%) -3.94
Max spot SAR (W/kg): 0.007
1g 10g
Max SAR (W/kg) 0.006 0.004
X Y Z
Location of Max
(mm): 74.7 -13.0 -109.3
Report No.: TS10110093-EME
Page 30 of 67
Plot #2 (2/2)
X-axis Scan
Y= 8.333mm , Z= -106.667mm
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
41.07767
44.477 67
47.877 67
51.277 67
54.677 67
58.077 67
61.47767
64.87767
68.27767
71.67767
75.077 67
X (mm)
SAR (W/kg)
Note: X-axis scan of indexSAR is equal to Z-axis scan required.
AREA SCAN:
Min Max Steps
Y-30.0 60.0 9.0
Scan Extent:
Z-180.0 -100.0 8.0
Report No.: TS10110093-EME
Page 31 of 67
Plot #3 (1/2)
Date: 2010/11/25
Position: Left Cheek
Filename: TL92271-LC.txt
Phantom: HeadFT06.csv
Device Tested: TL92271
Head Rotation: 0
Antenna: Integral
Test Frequency: 1924.992 MHz
Shape File: TL92271 front.csv Power Level: 20.26 dBm
Probe: 0136
Cal File: SN0136_1900_HEAD
X Y Z
Air 459 359 382
DCP 20 20 20
Cal Factors:
Lin .369 .369 .369
Batteries
Replaced: 2010/11/25
Liquid: 15.5 cm
Type: 1900 MHz Head
Conductivity: 1.3594
Relative Permittivity: 40.3382
Liquid Temp (deg C): 24
Ambient Temp (deg C): 24
Ambient RH (%): 52
Density (kg/m3): 1000
Software Version: 2.54
ZOOM SCAN RESULTS:
Start Scan End Scan
Spot SAR (W/kg): 0.003 0.003
Change during
Scan (%) -2.33
Max spot SAR (W/kg): 0.013
1g 10g
Max SAR (W/kg) 0.011 0.006
X Y Z
Location of Max
(mm): 77.6 -42.0 -132.9
Report No.: TS10110093-EME
Page 32 of 67
Plot #3 (2/2)
X-axis Scan
Y= -26mm , Z= -132mm
0
0.002
0.004
0.006
0.008
0.01
0.012
0.014
39.6369
43.036 9
46.436 9
49.836 9
53.236 9
56.636 9
60.0369
63.4369
66.8369
70.2369
73.636 9
X (mm)
SAR (W/kg)
Note: X-axis scan of indexSAR is equal to Z-axis scan required.
AREA SCAN:
Min Max Steps
Y-60.0 30.0 9.0
Scan Extent:
Z-180.0 -100.0 8.0
Report No.: TS10110093-EME
Page 33 of 67
Plot #4 (1/2)
Plot #4 (2/2)
Date: 2010/11/25
Position: Left Tilt
Filename: TL92271-LT.txt
Phantom: HeadFT06.csv
Device Tested: TL92271
Head Rotation: 0
Antenna: Integral
Test Frequency: 1924.992 MHz
Shape File: TL92271 front.csv Power Level: 20.26 dBm
Probe: 0136
Cal File: SN0136_1900_HEAD
X Y Z
Air 459 359 382
DCP 20 20 20
Cal Factors:
Lin .369 .369 .369
Batteries
Replaced: 2010/11/25
Liquid: 15.5 cm
Type: 1900 MHz Head
Conductivity: 1.3594
Relative Permittivity: 40.3382
Liquid Temp (deg C): 24
Ambient Temp (deg C): 24
Ambient RH (%): 52
Density (kg/m3): 1000
Software Version: 2.54
ZOOM SCAN RESULTS:
Start Scan End Scan
Spot SAR (W/kg): 0.002 0.002
Change during
Scan (%) -3.41
Max spot SAR (W/kg): 0.006
1g 10g
Max SAR (W/kg) 0.006 0.004
X Y Z
Location of Max
(mm): 78.2 -14.0 -117.1
Report No.: TS10110093-EME
Page 34 of 67
Plot #4 (2/2)
X-axis Scan
Y= 2mm , Z= -118mm
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
40.69067
44.090 67
47.490 67
50.890 67
54.290 67
57.690 67
61.09067
64.49067
67.89067
71.29067
74.690 67
X (mm)
SAR (W/kg)
Note: X-axis scan of indexSAR is equal to Z-axis scan required.
AREA SCAN:
Min Max Steps
Y-60.0 30.0 9.0
Scan Extent:
Z-180.0 -100.0 8.0
Report No.: TS10110093-EME
Page 35 of 67
APPENDIX B - Photographs
Exterior photo 1
Handset
Exterior photo 2
Handset
Report No.: TS10110093-EME
Page 36 of 67
Exterior photo 3
Accessories-Base unit
Exterior photo 4
Accessories-Base unit
Report No.: TS10110093-EME
Page 37 of 67
Exterior photo 5
Accessories- Base unit adapter
Exterior photo 6
Accessories- Base unit adapter label
Report No.: TS10110093-EME
Page 38 of 67
Exterior photo 7
Accessories- Battery
Exterior photo 8
Accessories- Battery
Report No.: TS10110093-EME
Page 39 of 67
APPENDIX C - E-Field Probe and 1900MHz Dipole Antenna Calibration Data
IMMERSIBLE SAR PROBE
CALIBRATION REPORT
Part Number: IXP – 050
S/N 0136
January 2010
Indexsar Limited
Oakfield House
Cudworth Lane
Newdigate
Surrey RH5 5BG
Tel: +44 (0) 1306 632 870
Fax: +44 (0) 1306 631 834
e-mail: enquiries@indexsar.com
Report No.: TS10110093-EME
Page 40 of 67
Reproduction of this report is authorized by Indexsar Ltd provided the report is reproduced in its entirety
.
Indexsar Limited
Oakfield House
Cudworth Lane Newdigate
Surrey RH5 5BG
Tel: +44 (0) 1306 632 870
Fax: +44 (0) 1306 631 834
e-mail: enquiries@indexsar.com
Calibration Certificate 1001/0136
Date of Issue: 14th January 2010
Immersible SAR Probe
Type: IXP-050
Manufacturer: IndexSAR, UK
Serial Number: 0136
Place of Calibration: IndexSAR, UK
Date of Receipt of Probe: 26th February 2009
Calibration Dates: 12th November — 24th December 2009
Customer: ITS
IndexSAR Ltd hereby declares that the IXP-050 Probe named above has been
calibrated for conformity to the IEEE 1528 and BSEN 62209-1 standards using the
methods described in this calibration document. Where applicable, the standards
used in the calibration process are traceable to the UK’s National Physical Laboratory.
Calibrated by:
Technical Manager
Approved by:
Director
Please keep this certificate with the calibration document. When the probe is sent for
a calibration check, please include the calibration document.
Report No.: TS10110093-EME
Page 41 of 67
INTRODUCTION
This Report presents measured calibration data for a particular Indexsar SAR probe (S/N
0136) only and describes the procedures used for characterisation and calibration.
Indexsar probes are characterised using procedures that, where applicable, follow the
recommendations of BSEN 62209-1 [Ref 1] & IEEE 1528 [Ref 2] standards. The procedures
incorporate techniques for probe linearisation, isotropy assessment and determination of
liquid factors (conversion factors). Calibrations are determined by comparing probe readings
with analytical computations in canonical test geometries (waveguides) using normalised
power inputs.
Each step of the calibration procedure and the equipment used is described in the sections
below.
CALIBRATION PROCEDURE
1. Objectives
The calibration process comprises four stages
1) Determination of the channel sensitivity factors which optimise the probe’s overall
rotational isotropy in 900MHz brain fluid
2) Determination of the channel sensitivity factors and angular offset of the X
channel which together optimise the probe’s spherical isotropy in 900MHz brain
fluid
3) Numerical combination of the two sets of channel sensitivity factors to give both
acceptable rotational isotropy and acceptable spherical isotropy values
4) At each frequency of interest, application of these channel sensitivity factors to
model the exponential decay of SAR in a waveguide fluid cell, and hence derive
the liquid conversion factors at that frequency
2. Probe output
The probe channel output signals are linearised in the manner set out in Refs [1] and [2].
The following equation is utilized for each channel:
Ulin = Uo/p + Uo/p 2 / DCP (1)
where Ulin is the linearised signal, Uo/p is the raw output signal in mV and DCP is the diode
compression potential in similar voltage units.
DCP is determined from fitting equation (1) to measurements of Ulin versus source feed power
over the full dynamic range of the probe. The DCP is a characteristic of the Schottky diodes
used as the sensors. For the IXP-050 probes with CW signals the DCP values are typically
100mV (or 20 in the voltage units used by Indexsar software, which are V*200).
In turn, measurements of E-field are determined using the following equation (where output
voltages are also in units of V*200):
Eliq2 (V/m) = Ulinx * Air Factorx* Liq Factorx
+ Uliny * Air Factory* Liq Factory
+ Ulinz * Air Factorz* Liq Factorz (3)
Report No.: TS10110093-EME
Page 42 of 67
Here, “Air Factor” represents each channel’s sensitivity, while “Liq Factor” represents the
enhancement in signal level when the probe is immersed in tissue-simulant liquids at each
frequency of interest.
3. Selecting channel sensitivity factors to optimise isotropic response
After manufacture, the first stage of the calibration process is to balance the three channels’
Air Factor values, thereby optimising the probe’s overall axial response (“rotational isotropy”).
To do this, a 900MHz waveguide containing head-fluid simulant is selected. Like all
waveguides used during probe calibration, this particular waveguide contains two distinct
sections: an air-filled launcher section, and a liquid cell section, separated by a dielectric
matching window designed to minimise reflections at the air-liquid interface.
The waveguide stands in an upright position and the liquid cell section is filled with 900MHz
brain fluid to within 10 mm of the open end. The depth of liquid ensures there is negligible
radiation from the waveguide open top and that the probe calibration is not influenced by
reflections from nearby objects.
During the measurement, a TE01 mode is launched into the waveguide by means of an N-
type-to-waveguide adapter. The probe is then lowered vertically into the liquid until the tip is
exactly 10mm above the centre of the dielectric window. This particular separation ensures
that the probe is operating in a part of the waveguide where boundary corrections are not
necessary.
Care must also be taken that the probe tip is centred while rotating.
The exact power applied to the input of the waveguide during this stage of the probe
calibration is immaterial since only relative values are of interest while the probe rotates.
However, the power must be sufficiently above the noise floor and free from drift.
The dedicated Indexsar calibration software rotates the probe in 10 degree steps about its
axis, and at each position, an Indexsar ‘Fast’ amplifier samples the probe channels 500 times
per second for 0.4 s. The raw Uo/p data from each sample are packed into 10 bytes and
transmitted back to the PC controller via an optical cable. Ulinx, Uliny and Ulinz are derived from
the raw Uo/p values and written to an Excel template.
Once data have been collected from a full probe rotation, the Air Factors are adjusted using
a special Excel Solver routine to equalise the output from each channel and hence minimise
the rotational isotropy. This automated approach to optimisation removes the effect of
human bias.
Figure 5 represents the output from each diode sensor as a function of probe rotation angle.
4. Measurement of Spherical Isotropy
The setup for measuring the probe’s spherical isotropy is shown in Figure 2.
A box phantom containing 900MHz head fluid is irradiated by a vertically-polarised, tuned
dipole, mounted to the side of the phantom on the robot’s seventh axis. During calibration,
the spherical response is generated by rotating the probe about its axis in 20 degree steps
and changing the dipole polarisation in 10 degree steps.
By using the VPM technique discussed below, an allowance can also be made for the effect
Report No.: TS10110093-EME
Page 43 of 67
of E-field gradient across the probe’s spatial extent. This permits values for the probe’s
effective tip radius and X-channel angular offset to be modelled until the overall spherical
isotropy figure is optimised.
The dipole is connected to a signal generator and amplifier via a directional coupler and
power meter. As with the determination of rotational isotropy, the absolute power level is not
important as long as it is stable.
The probe is positioned within the fluid so that its sensors are at the same vertical height as
the centre of the source dipole. The line joining probe to dipole should be perpendicular to
the phantom wall, while the horizontal separation between the two should be small enough
for VPM corrections to be applicable, without encroaching near the boundary layer of the
phantom wall. VPM corrections require a knowledge of the fluid skin depth. This is
measured during the calibration by recording the E-field strength while systematically moving
the probe away from the dipole in 2mm steps over a 20mm range.
The directionality of the orthogonally-arranged sensors can be checked by analysing the data
using dedicated Indexsar software, which displays the data in 3D format, a representative
image of which is shown in Figure 3. The left-hand side of this diagram shows the individual
channel outputs after linearisation (see above). The program uses these data to balance the
channel outputs and then applies an optimisation process, which makes fine adjustments to
the channel factors for optimum isotropic response.
5. Determination of Conversion (“Liquid”) Factors at each frequency of interest
A lookup table of conversion factors for a probe allows a SAR value to be derived at the
measured frequencies, and for either brain or body fluid-simulant.
The method by which the conversion factors are assessed is based on the comparison
between measured and analytical rates of decay of SAR with height above a dielectric
window. This way, not only can the conversion factors for that frequency/fluid combination
be determined, but an allowance can also be made for the scale and range of boundary layer
effects.
The theoretical relationship between the SAR at the cross-sectional centre of the lossy
waveguide as a function of the longitudinal distance (z) from the dielectric separator is given
by Equation 4:
()
2/
4
() fb z
PP
SAR z e
ab
δ
ρδ
= (4)
Here, the density ρ is conventionally assumed to be 1000 kg/m3, ab is the cross-sectional
area of the waveguide, and Pf and Pb are the forward and reflected power inside the lossless
section of the waveguide, respectively. The penetration depth
δ
(which is the reciprocal of
the waveguide-mode attenuation coefficient) is a property of the lossy liquid and is given by
Equation (5).
() ( )
{
}
1
2
Re / oor
aj j
δπωμσωεε
⎡⎤
=++
⎢⎥
⎣⎦
(5)
Report No.: TS10110093-EME
Page 44 of 67
where σ is the conductivity of the tissue-simulant liquid in S/m, εr is its relative permittivity,
and ω is the radial frequency (rad/s). Values for σ and εr are obtained prior to each
waveguide test using an Indexsar DiLine measurement kit, which uses the TEM method as
recommended in [2]. σ and εr are both temperature- and fluid-dependent, so are best
measured using a sample of the tissue-simulant fluid immediately prior to the actual
calibration.
Wherever possible, all DiLine and calibration measurements should be made in the open
laboratory at 22 + 2.0oC; if this is not possible, the values of σ and εr should reflect the actual
temperature. Values employed for calibration are listed in the tables below.
By ensuring the liquid height in the waveguide is at least three penetration depths, reflections
at the upper surface of the liquid are negligible. The power absorbed in the liquid is therefore
determined solely from the waveguide forward and reflected power.
Different waveguides are used for 835/900MHz, 1800/1900MHz, 2100/2450/2600MHz and
5200/5800MHz measurements. Table A.1 of [1] can be used for designing calibration
waveguides with a return loss greater than 20 dB at the most important frequencies used for
personal wireless communications, and better than 15dB for frequencies greater than 5GHz.
Values for the penetration depth for these specific fixtures and tissue-simulating mixtures are
also listed in Table A.1.
According to [1], this calibration technique provides excellent accuracy, with standard
uncertainty of less than 3.6% depending on the frequency and medium. The calibration itself
is reduced to power measurements traceable to a standard calibration procedure. The
practical limitation to the frequency band of 800 to 5800 MHz because of the waveguide size
is not severe in the context of compliance testing.
During calibration, the probe is lowered carefully until it is just touching the cross-sectional
centre of the dielectric window. 200 samples are then taken and written to an Excel template
file before moving the probe vertically upwards. This cycle is repeated 150 times. The
vertical separation between readings is determined from practical considerations of the
expected SAR decay rate, and range from 0.2mm steps at low frequency, through 0.1mm at
2450MHz, down to 0.05mm at 5GHz.
Once the data collection is complete, a Solver routine is run which optimises the measured-
theoretical fit by varying the conversion factor, and the boundary correction size and range.
For 450 MHz calibrations, a slightly different technique must be used — the equatorial
response of the probe-under-test is compared with the equivalent response of a probe whose
450MHz characteristics have already been determined by NPL. The conversion factor of the
probe-under-test can then be deduced.
VPM (Virtual Probe Miniaturisation)
SAR probes with 3 diode-sensors in an orthogonal arrangement are designed to display an
isotropic response when exposed to a uniform field. However, the probes are ordinarily used
for measurements in non-uniform fields and isotropy is not assured when the field gradients
are significant compared to the dimensions of the tip containing the three orthogonally-
arranged dipole sensors.
It becomes increasingly important to assess the effects of field gradients on SAR probe
readings when higher frequencies are being used. For Indexsar IXP-050 probes, which are
of 5mm tip diameter, field gradient effects are minor at GSM frequencies, but are major
Report No.: TS10110093-EME
Page 45 of 67
above 5GHz. Smaller probes are less affected by field gradients and so probes, which are
significantly less than 5mm diameter, would be better for applications above 5GHz.
The IndexSAR report IXS0223 describes theoretical and experimental studies to evaluate
the issues associated with the use of probes at arbitrary angles to surfaces and field
directions. Based upon these studies, the procedures and uncertainty analyses referred to in
P1528 are addressed for the full range of probe presentation angles.
In addition, generalized procedures for correcting for the finite size of immersible SAR probes
are developed. Use of these procedures enables application of schemes for virtual probe
miniaturization (VPM) – allowing probes of a specific size to be used where physically-
smaller probes would otherwise be required.
Given the typical dimensions of 3-channel SAR probes presently available, use of the VPM
technique extends the satisfactory measurement range to higher frequencies.
CALIBRATION FACTORS MEASURED FOR PROBE S/N 0136
The probe was calibrated at 450, 835, 900, 1800, 1900, 2100, 2450 and 2600 MHz in
liquid samples representing brain and body liquid at these frequencies.
The calibration was for CW signals only, and the axis of the probe was parallel to the
direction of propagation of the incident field i.e. end-on to the incident radiation. The
axial isotropy of the probe was measured by rotating the probe about its axis in 10
degree steps through 360 degrees in this orientation.
The reference point for the calibration is in the centre of the probe’s cross-section at a
distance of 2.7 mm from the probe tip in the direction of the probe amplifier. A value of 2.7
mm should be used for the tip to sensor offset distance in the software. The distance of
2.7mm for assembled probes has been confirmed by taking X-ray images of the probe tips
(see Figure 9).
It is important that the diode compression point and air factors used in the software are the
same as those quoted in the results tables, as these are used to convert the diode output
voltages to a SAR value.
CALIBRATION EQUIPMENT
The table on page 20 indicates the calibration status of all test equipment used during probe
calibration.
Report No.: TS10110093-EME
Page 46 of 67
MEASUREMENT UNCERTAINTIES
A complete measurement uncertainty analysis for the SARA2 measurement system has
been published in Reference [3]. Table 10 from that document is re-created below, and lists
the uncertainty factors associated just with the calibration of probes.
Source of
uncertainty
Uncert
ainty
value ±
%
Probab
ility
distribu
tion
Divis
or ci
Standard
uncertainty ui
± %
vi or
veff
Incident or forward
power 5.743 N 1.00 1 5.743
Refelected power 5.773 N 1.00 1 5.773
Liquid conductivity 1.120 N 1.00 1 1.120
Liquid permittivity 1.085 N 1.00 1 1.085
Field homgeneity 0.002 R 1.73 1 0.001
Probe positioning: +/-
0.05mm 0.55 R 1.73 1 0.318
Influence on Probe pos:
11%/mm
Field probe linearity 4.7 R 1.73 1 2.714
Combined standard
uncertainty RSS 8.729
At the 95% confidence level, therefore, the expanded uncertainty is 17.1%
Report No.: TS10110093-EME
Page 47 of 67
0
30
60
90
120
150
180
0
100
200
300 -6.00
-4.00
-2.00
0.00
2.00
4.00
6.00
dB
φ
(pola rization rota tion)
θ
(probe rota tion)
Surface Isotropy diagram of IXP-050 Probe S/N 0136 at 900MHz after VPM (rotational
isotropy axial +/-0.09dB, spherical isotropy +/-0.28dB)
Probe tip radius 1.25
X Ch. Angle to red dot -8.1
Head Body
Frequency Bdy. Corrn.
f(0)
Bdy. Corrn. –
d(mm)
Bdy. Corrn. –
f(0)
Bdy. Corrn. –
d(mm)
450 0.0 1.0 0.0 1.0
835 0.9 1.4 1.4 1.2
900 1.2 1.3 1.2 1.3
1800 0.9 1.5 0.9 1.5
1900 0.9 1.6 1.0 1.5
2100 0.9 1.4 0.8 1.8
2450 0.8 1.6 0.8 1.8
2600 0.9 1.5 0.7 1.8
Report No.: TS10110093-EME
Page 48 of 67
SUMMARY OF CALIBRATION FACTORS FOR PROBE IXP-050 S/N 0136
Spherical isotropy measured at 900MHz 0.28 (+/-) dB
X Y Z
Air Factors 459 359 382 (V*200)2/mV
CW DCPs 20 20 20 V*200
Axial Isotropy SAR ConvF
(+/- dB) (liq/air)
Freq (MHz)
Head Body Head Body
Notes
450 - - 0.336 0.316 3
835 - - 0.279 0.295 1,2
900 0.09 - 0.289 0.303 1,2
1800 - - 0.352 0.388 1,2
1900 - - 0.369 0.413 1,2
2100 - - 0.374 0.427 1,2
2450 - - 0.406 0.459 1,2
2600 - - 0.437 0.490 1,2
Notes
1) Calibrations done at 22oC +/-2oC
2) Waveguide calibration
3) Transfer calibration
Report No.: TS10110093-EME
Page 49 of 67
PROBE SPECIFICATIONS
Indexsar probe 0136, along with its calibration, is compared with BSEN 62209-1 and IEEE
standards recommendations (Refs [1] and [2]) in the Tables below. A listing of relevant
specifications is contained in the tables below:
Dimensions S/N 0136 BSEN [1] IEEE [2]
Overall length (mm) 350
Tip length (mm) 10
Body diameter (mm) 12
Tip diameter (mm) 5.2 8 8
Distance from probe tip to dipole
centers (mm)
2.7
Dynamic range S/N 0136 BSEN [1] IEEE [2]
Minimum (W/kg) 0.01 <0.02 0.01
Maximum (W/kg)
N.B. only measured to > 100 W/kg on
representative probes
>100 >100 100
Isotropy (measured at 900MHz) S/N 0136 BSEN [1] IEEE [2]
Axial rotation with probe normal to
source (+/- dB)
0.09
0.5 0.25
Spherical isotropy covering all
orientations to source (+/- dB)
0.28
1.0 0.50
Construction Each probe contains three orthogonal
dipole sensors arranged on a triangular
prism core, protected against static
charges by built-in shielding, and covered
at the tip by PEEK cylindrical enclosure
material. No adhesives are used in the
immersed section. Outer case materials
are PEEK and heat-shrink sleeving.
Chemical resistance Tested to be resistant to TWEEN20 and
sugar/salt-based simulant liquids but
probes should be removed, cleaned and
dried when not in use.
NOT recommended for use with glycol or
soluble oil-based liquids.
Report No.: TS10110093-EME
Page 50 of 67
REFERENCES
[1] BSEN 62209-1:2006. Human exposure to radio frequency fields from hand-held and body-
mounted wireless communication devices — Human models, instrumentation, and procedures —
Part 1: Procedure to determine the specific absorption rate (SAR) for hand-held devices used in
close proximity to the ear (frequency range of 300 MHz to 3 GHz)
[2] IEEE 1528, 2003 Recommended Practice for Determining the Peak Spatial-Average Specific
Absorption Rate (SAR) in the Human Head from Wireless Communications Devices: Measurement
Techniques
[3] Indexsar Report IXS-0300, October 2007. Measurement uncertainties for the SARA2 system
assessed against the recommendations of BS EN 62209-1:2006
Report No.: TS10110093-EME
Page 51 of 67
Figure 1. Spherical isotropy jig showing probe, dipole and box filled with simulated brain liquid (see
Ref [2], Section A.5.2.1)
Figure 2. Schematic diagram of the test geometry used for isotropy determination
0
70
140
-6.00
-4.00
-2.00
0.00
2.00
4.00
6.00
dB
Report No.: TS10110093-EME
Page 52 of 67
Figure 3. Graphical representation of probe 0136’s response to fields applied from each direction.
The diagram on the left shows the individual response characteristics of each of the three channels
and the diagram on the right shows the resulting probe sensitivity in each direction. The colour
range in the figure images the lowest values as blue and the maximum values as red. For probe S/N
0136, this range is (+/-) 0.28.
Figure 4. Geometry used for waveguide calibration (after Ref [2]. Section A.3.2.2)
Report No.: TS10110093-EME
Page 53 of 67
835 - 900 MHz (WG4) Head liquid 900 MHz
0
10 20
30
40
50
60
70
80
90
10 0
110
12 0
13 0
14 0
15 0
16 0
17 0
18 0
19 0
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340 350
X Y Z Tot
Isot ropy Error ( Φ), θ = 0
o
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 60 120 180 240 300 360
Figure 5. The rotational isotropy of probe S/N 0136 obtained by rotating the probe in a liquid-filled
waveguide at 900 MHz.
Report No.: TS10110093-EME
Page 54 of 67
835 - 900 MHz (WG4) Head liquid 835 MHz
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
010203040
z (mm)
SAR (W/kg)
Analytical Measurements
835 - 900 MHz (WG4) Body liquid 835 MHz
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
010203040
z (mm)
SAR (W/kg)
Analytical Measurements
835 - 900 MHz (WG4) Head liquid 900 MHz
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
010203040
z (mm)
SAR (W/kg)
Analytical Measurements
835 - 900 MHz (WG4) Body liquid 900 MHz
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
010203040
z (mm)
SAR (W/kg)
Analytical Measurements
Figure 6. The measured SAR decay function along the centreline of the WG4 waveguide
with conversion factors adjusted to fit to the theoretical function for the particular dimension,
frequency, power and liquid properties employed.
Report No.: TS10110093-EME
Page 55 of 67
1800 - 1900 (WG8) Head liquid 1800 MHz
0
1
2
3
4
5
6
01020
z (mm)
SAR (W/kg)
Analytical Measurements
1800 - 1900 (WG8) Body liquid 1800 MHz
0
1
2
3
4
5
6
01020
z (mm)
SAR (W/kg)
Analytical Measurements
1800 - 1900 (WG8) Head liquid 1900 MHz
0
1
2
3
4
5
6
01020
z (mm)
SAR (W/kg)
Analytical Measurements
1800 - 1900 (WG8) Body liquid 1900 MHz
0
1
2
3
4
5
6
01020
z (mm)
SAR (W/kg)
Analytical Measurements
Report No.: TS10110093-EME
Page 56 of 67
2000 - 2500 (WG8) Head liquid 2100 MHz
0
1
2
3
4
5
6
7
01020
z (mm)
SAR (W/kg)
Analytical Measurements
2000 - 2500 (WG8) Body liquid 2100 MHz
0
1
2
3
4
5
6
01020
z (mm)
SAR (W/kg)
Analytical Measurements
2000 - 2500 (WG8) Head liquid 2450 MHz
0
1
2
3
4
5
6
7
8
01020
z (mm)
SAR (W/kg)
Analytical Measurements
2000 - 2500 (WG8) Body liquid 2450 MHz
0
1
2
3
4
5
6
7
8
01020
z (mm)
SAR (W/kg)
Analytical Measurements
Report No.: TS10110093-EME
Page 57 of 67
2000 - 2500 (WG8) Head liquid 2600 MHz
0
1
2
3
4
5
6
7
8
01020
z (mm)
SAR (W/kg)
Analytical Measurements
2000 - 2500 (WG8) Body liquid 2600 MHz
0
1
2
3
4
5
6
7
8
01020
z (mm)
SAR (W/kg)
Analytical Measurements
Figure 7. The measured SAR decay function along the centreline of the R22 waveguide
with conversion factors adjusted to fit to the theoretical function for the particular dimension,
frequency, power and liquid properties employed.
Report No.: TS10110093-EME
Page 58 of 67
Figure 9: X-ray positive image of 5mm probes
Table indicating the dielectric parameters of the liquids used for calibrations at each
frequency
BRAIN BODY
Frequency
(MHz) Relative
permittivity
(measured)
Conductivity
(S/m)
(measured)
Relative
permittivity
(measured)
Conductivity
(S/m)
(measured)
450 44.28 0.847 57.57 0.856
835 42.00 0.916 55.98 0.990
900 41.42 0.978 55.45 1.054
1800 39.01 1.435 53.14 1.555
1900 39.67 1.440 53.98 1.539
2100 39.22 1.521 53.64 1.677
2450 37.95 1.865 52.54 2.061
2600 37.21 2.057 52.08 2.221
Report No.: TS10110093-EME
Page 59 of 67
Table of test equipment calibration status
Instrument
description
Supplier /
Manufacturer Model Serial No.
Last
calibration
date
Calibration
due date
Power sensor Rohde &
Schwarz NRP-Z23 100063 16/06/2008 16/6/2010
Dielectric
property
measurement
Indexsar
DiLine
(sensor lengths:
160mm, 80mm
and 60mm)
N/A
(absolute) –
checked
against NPL
values using
reference
liquids
N/A
Vector network
analyser Anritsu MS6423B 003102 09/10/2008 12/01/2010
SMA
autocalibration
module
Anritsu 36581KKF/1 001902 09/10/2008 12/01/2010
Report No.: TS10110093-EME
Page 60 of 67
Report No. SN0217_0812
9th December 2008
INDEXSAR
1900 MHz Validation Dipole
Type IXD-190 S/N 0217
Performance measurements
Dr Tony Brinklow
Indexsar, Oakfield House, Cudworth Lane,
Newdigate, Surrey RH5 5BG. UK.
Tel: +44 (0) 1306 632 870 Fax: +44 (0) 1306 631 834
E-mail: enquiries@indexsar.com
Report No.: TS10110093-EME
Page 61 of 67
Measurement Conditions
Measurements were performed using a box-shaped phantom made of PMMA with
dimensions designed to meet the accuracy criteria for reasonably-sized phantoms that do
not have liquid capacities substantially in excess of the volume of liquid required to fill the
Indexsar upright SAM phantoms used for SAR testing of handsets against the ear. The wall
thickness was 2mm.
An Anritsu MS4623B vector network analyser was used for the return loss measurements.
The dipole was placed in a special holder made of low-permittivity, low-loss materials. This
holder enables the dipole to be positioned accurately in the centre of the wall of the
Indexsar box-phantom used for flat-surface testing and validation checks.
The validation dipoles are supplied with special spacers made from a low-permittivity, low-
loss foam material. These spacers are fitted to the dipole arms to ensure that, when the
dipole is offered up to the phantom surface, the spacing between the dipole and the liquid
surface is accurately aligned according to the guidance in the relevant standards
documentation [1]. The spacers are rectangular with a central hole equal to the dipole arm
diameter and dimensioned so that the longer side can be used to ensure a spacing of
15mm from the liquid in the phantom (for tests at 1000MHz and below) and the shorter side
can be used for tests at 1000MHz and above to ensure a spacing of 10mm from the liquid in
the phantom. The spacers are made on a CNC milling machine with an accuracy of 1/40th
mm but they may suffer wear and tear and need to be replaced periodically. The material
used is Rohacell, which has a relative permittivity of approx. 1.05 and a negligible loss
tangent.
The apparatus supplied by Indexsar for dipole validation tests thus includes:
Balanced dipoles for each frequency required are dimensioned according to the guidelines
given in IEEE 1528 [1]. The dipoles are made from semi-rigid 50 Ohm co-ax, which is joined
by soldering and is gold-plated subsequently. The constructed dipoles are easily deformed,
if mis-handled, and periodic checks need to be made of their symmetry.
Rohacell foam spacers designed for presenting the dipoles to 2mm thick PMMA box
phantoms. These components also suffer wear and tear and should be replaced when the
central hole is a loose-fit on the dipole arms or if the edges are too worn to ensure accurate
alignment. The standard spacers are dimensioned for use with 2mm wall thickness
(additional spacers are available for 4mm wall thickness).
Report No.: TS10110093-EME
Page 62 of 67
Dipole impedance and return loss
The dipoles are designed to have low return loss ONLY when presented against a lossy-
phantom at the specified distance. A Vector Network Analyser (VNA) was used to perform a
return loss measurement on the specific dipole when in the measurement-location against
the box phantom. The distance was as specified in the standard i.e. 15mm from the liquid
(for 1900MHz). The Indexsar foam spacers (described above) were used to ensure this
condition during measurement.
The impedance was measured at the SMA-connector with the network analyser.
The following parameters were measured against Head fluid:
Dipole impedance at 1900 MHz Re{Z} = 49.9
Im{Z} = -2.0
Return loss at 1900MHz -32.7 dB
The measurements were also repeated against 1900 Body fluid:
Report No.: TS10110093-EME
Page 63 of 67
Dipole impedance at 1900 MHz Re{Z} = 45.5
Im{Z} = -0.8
Return loss at 1900MHz -26.4 dB
SAR Validation Measurement in Brain Fluid
SAR validation checks have been performed using the 1900MHz dipole and the box-
phantom located on the SARA2 phantom support base on the SARA2 robot system. Tests
were then conducted at a feed power level of approx. 0.25W. The actual power level was
recorded and used to normalise the results obtained to the standard input power conditions
of 1W (forward power). The ambient temperature was 21oC +/- 1oC and the relative humidity
was around 35% during the measurements.
The phantom was filled with a 1900MHz brain liquid using a recipe from [1], which has the
following electrical parameters (measured using an Indexsar DiLine kit) at 1900MHz at the
measurement temperature:
Relative Permittivity 39.18
Conductivity 1.57 S/m
The SARA2 software version 2.54 VPM was used with Indexsar IXP_050 probe Serial
Number 0127 previously calibrated using waveguides.
Report No.: TS10110093-EME
Page 64 of 67
The 3D measurement made using the dipole at the bottom of the phantom box is shown
below:
SAR measurement standard 62209-1 [ref 2] tabulates the volume-averaged 1g and 10g
SAR values over a range of frequencies up to 3000MHz. The following values are listed for
1900MHz:
SAR values (W/kg)
(Normalised to 1W feed power)
1g SAR 39.7
10g SAR 20.5
The validation results, also normalised to an input power of 1W (forward power) were:
Measured SAR values (W/kg)
(Normalised to 1W feed power) % Deviation from Standard
1g SAR 39.7 0.0%
10g SAR 21.2 +3.2%
Report No.: TS10110093-EME
Page 65 of 67
SAR Measurement in Body Fluid
SAR validation checks are only defined in the standard against brain simulant fluid.
Nonetheless, it is possible to measure the effective volume-averaged SAR values against
body fluid, simply to provide a reference value.
The ambient temperature was 22oC +/- 1oC and the relative humidity was around 32%
during the measurements.
The phantom was filled with a 1900MHz body liquid using a recipe from [1], which has the
following electrical parameters (measured using an Indexsar DiLine kit) at 1900MHz at the
measurement temperature:
Relative Permittivity 54.01
Conductivity 1.55 S/m
The SARA2 software version 2.54 VPM was used with Indexsar IXP_050 probe Serial
Number 0127 previously calibrated using waveguides.
The 3D measurement made using the dipole at the bottom of the phantom box is shown
below:
Report No.: TS10110093-EME
Page 66 of 67
The validation results, also normalised to an input power of 1W (forward power) were:
Measured SAR values (W/kg)
(Normalised to 1W feed power) % Deviation from Standard
1g SAR 38.8 N/A
10g SAR 20.7 N/A
Dipole handling
The dipoles are made from standard, copper-sheathed coaxial cable. In assembly, the
sections are joined using ordinary soft-soldering. This is necessary to avoid excessive heat
input in manufacture, which would destroy the polythene dielectric used for the cable. The
consequence of the construction material and the assembly technique is that the dipoles are
fragile and can be deformed by rough handling. Conversely, they can be straightened quite
easily as described in this report.
If a dipole is suspected of being deformed, a normal workshop lathe can be used as an
alignment jig to restore the symmetry. To do this, the dipole is first placed in the headstock
of the lathe (centred on the plastic or brass spacers) and the headstock is rotated by hand
(do NOT use the motor). A marker (lathe tool or similar) is brought up close to the end of
one dipole arm and then the headstock is rotated by 0.5 rev. to check the opposing arm. If
they are not balanced, judicious deformation of the arms can be used to restore the
symmetry.
If a dipole has a failed solder joint, the dipole can be fixed down in such a way that the arms
are co-linear and the joint re-soldered with a reasonably-powerful electrical soldering iron.
Do not use gas soldering irons. After such a repair, electrical tests must be performed as
described below.
Please note that, because of their construction, the dipoles are short-circuited for DC
signals.
Tuning the dipole
The dipole dimensions are based on calculations that assumed specific liquid dielectric
properties. If the liquid dielectric properties are somewhat different, the dipole tuning will
also vary. A pragmatic way of accounting for variations in liquid properties is to ‘tune’ the
dipole (by applying minor variations to its effective length). For this purpose, Indexsar can
supply short brass tube lengths to extend the length of the dipole and thus ‘tune’ the dipole.
It cannot be made shorter without removing a bit from the arm. An alternative way to tune
the dipole is to use copper shielding tape to extend the effective length of the dipole. Do
both arms equally.
Report No.: TS10110093-EME
Page 67 of 67
It should be possible to tune a dipole as described, whilst in place in the measurement
position as long as the user has access to a VNA for determining the return loss.
References
[1] IEEE Std 1528-2003. IEEE recommended practice for determining the peak spatial-
average specific absorption rate (SAR) in the human body due to wireless communications
devices: Measurement Techniques – Description.
[2] BS EN 62209-1:2006 Human exposure to radio frequency fields from hand-held and
body-mounted wireless communication devices — Human models, instrumentation, and
procedures — Part 1: Procedure to determine the specific absorption rate (SAR) for hand-
held devices used in close proximity to the ear (frequency range of 300 MHz to 3 GHz)
Download: 80-7764-00 1.9GHz Cordless Phone with Bluetooth RF Exposure Info TS10110093-EME_SAR_TL92271 VTech Telecommunications Ltd
Mirror Download [FCC.gov]80-7764-00 1.9GHz Cordless Phone with Bluetooth RF Exposure Info TS10110093-EME_SAR_TL92271 VTech Telecommunications Ltd
Document ID1408059
Application IDdUe0mruq1SHsx9l9vKK8hg==
Document DescriptionSAR Report
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeRF Exposure Info
Display FormatAdobe Acrobat PDF - pdf
Filesize169.63kB (2120418 bits)
Date Submitted2011-01-24 00:00:00
Date Available2011-01-24 00:00:00
Creation Date2010-12-10 12:12:24
Producing SoftwareAcrobat Distiller 7.0.5 (Windows)
Document Lastmod2010-12-10 12:17:45
Document TitleTS10110093-EME_SAR_TL92271
Document CreatorPScript5.dll Version 5.2.2
Document Author: julie.wang