Contents 1. 2. 3. 4. 5. Description of Equipment Under Test (EUT) .......................................................................................... Introduction................................................................................................................................................ SAR Definition ........................................................................................................................................... SAR Measurement Setup.....................
1. Description of Equipment Under Test (EUT) IOGEAR, Inc. Applicant: 23 Hubble,Irvine, CA92618, USA Manufacturer FCC ID Model Name : ATake Co. Ltd. : QLEGBU341 : Bluetooth 2.0 EDR Enhanced Data Model Number : Test Device Tx Frequency Max. RF Conducted Power Max.
2. Introduction The A Test Lab Techno Corp. has performed measurements of the maximum potential exposure to the user of IOGEAR, Inc. Model(s) : GBU341WM,GBU341W1,GBU341W2,GBU341W3,GBU341W4,GBU341W5, GBU341W6,GBU341W7,GBU341W8,GBU341W9,GBU341P,GBU341. The test procedures, as described in American National Standards, Institute C95.1 - 1999[1], FCC/OET Bulletin 65 Supplement C [July 2001] were employed and they specify the maximum exposure limit of 1.
3. SAR Definition Specific Absorption Rate (SAR) is defined as the time derivative (rate) of the incremental energy (dw) absorbed by (dissipated in) an incremental mass (dm) contained in a volume element (dv) of a given density ( ρ ). It is also defined as the rate of RF energy absorption per unit mass at a point in an absorbing body (see Figure 2). SAR = d ⎛ dw ⎞ ⎜ ⎟ = dt ⎝ dm ⎠ d ⎛ dw ⎞ ⎜ ⎟ dt ⎜⎝ ρdv ⎟⎠ Figure 2.
4. SAR Measurement Setup These measurements were performed with the automated near-field scanning system DASY4 from Schmid & Partner Engineering AG (SPEAG). The system is based on a high precision robot (working range greater than 0.9m) which positions the probes with a positional repeatability of better than ±0.025mm.
The DAE3 consists of a highly sensitive electrometer-grade preamplifier with auto-zeroing, a channel and gain-switching multiplexer, a fast 16 bit AD-converter and a command decoder and control logic unit. Transmission to the PC-card is accomplished through an optical downlink for data and status information and an optical uplink for commands and clock lines. The mechanical probe mounting device includes two different sensor systems for frontal and sidewise probe contacts.
5. System Components 5.1 DASY4 E-Field Probe System The SAR measurements were conducted with the dosimetric probe ET3DV6 (manufactured by SPEAG), designed in the classical triangular configuration[3]and optimized for dosimetric evaluation. The probes is constructed using the thick film technique; with printed resistive lines on ceramic substrates. The probe is equipped with an optical multi-fiber line ending at the front of the probe tip.
5.1.1 EX3DV3 E-Field Probe Specification Construction Symmetrical design with triangular core Built-in optical fiber for surface detection System (EX3DV3 only) Built-in shielding against static charges PEEK enclosure material (resistant to organic solvents, e.q.
5.1.2 EX3DV3 E-Field Probe Calibration Each probe is calibrated according to a dosimetric assessment procedure described in[4]with accuracy better than ±10%. The spherical isotropy was evaluated with the procedure described in[5]and found to be better than ±0.25dB. The sensitivity parameters (NormX, NormY, and NormZ), the diode compression parameter (DCP) and the conversion factor (ConvF) of the probe are tested. The free space E-field from amplified probe outputs is determined in a test chamber.
5.3 Robot Positioner: Stäubli Unimation Corp. Robot Model: RX90L Repeatability: ±0.025 mm No. of Axis: 6 5.4 Measurement Server Processor: PC/104 with a 166MHz low-power Pentium I/O-board: Link to DAE3 16-bit A/D converter for surface detection system Digital I/O interface Serial link to robot Direct emergency stop output for robot 5.5 Device Holder for Transmitters In combination with the SAM Twin Phantom V4.
5.6 Phantom - SAM v4.0 The shell corresponds to the specifications of the Specific Anthropomorphic Mannequin (SAM) phantom defined in IEEE 1528-2003, CENELEC 50361 and IEC 62209. It enables the dosimetric evaluation of left and right hand phone usage as well as body mounted usage at the flat phantom region. A cover prevents evaporation of the liquid.
5.7.2 Data Evaluation The DASY4 post processing software (SEMCAD) automatically executes the following procedures to calculate the field units from the microvolt readings at the probe connector.
H-field probes: with H i = Vi ⋅ ai 0 + ai1 f + ai 2 f 2 f Vi = compensated signal of channel i (i = x, y, z) Normi = sensor sensitivity of channel i (i = x, y, z) 2 μV/(V/m) for E-field Probes ConvF = sensitivity enhancement in solution aij = sensor sensitivity factors for H-field probes f = carrier frequency [GHz] Ei = electric field strength of channel i in V/m Hi = magnetic field strength of channel i in A/m The RSS value of the field components gives the total field strength (Hermitian magnitud
6. Test Equipment List Manufacturer Name of Equipment Type/Model Serial Number Calibration Last Cal. Due Date SPEAG Dosimetric E-Filed Probe ET3DV6 1530 Sep. 21, 2006 Sep. 21, 2007 SPEAG 2450MHz System Validation Kit D2450V2 712 Feb. 16, 2006 Feb. 16, 2007 SPEAG Data Acquisition Electronics DAE4 541 Oct. 16, 2006 Oct. 16, 2007 SPEAG Device Holder N/A N/A NCR NCR SPEAG Phantom SAM V4.
7. Tissue Simulating Liquids The mixture is calibrated to obtain proper dielectric constant (permittivity) and conductivity of the tissue. The dielectric parameters of the liquids were verified prior to the SAR evaluation using an 85070C Dielectric Probe Kit and an 8720ES Network Analyzer. FREQUENCY INGREDIENT HSL5G (Head) MSL5G (Body) Water 64% 78% Mineral Oil 18% 11% Emulsifiers 15% 9% Additives and Salt 3% 2% Table 3.
Target Frequency Head Body (MHz) εr σ (S/m) εr σ (S/m) 150 52.3 0.76 61.9 0.80 300 45.3 0.87 58.2 0.92 450 43.5 0.87 56.7 0.94 835 41.5 0.90 55.2 0.97 900 41.5 0.97 55.0 1.05 915 41.5 0.98 55.0 1.06 1450 40.5 1.20 54.0 1.30 1610 40.3 1.29 53.8 1.40 1800 - 2000 40.0 1.40 53.3 1.52 2450 39.2 1.80 52.7 1.95 3000 38.5 2.40 52.0 2.73 5800 35.3 5.27 48.2 6.00 ( εr = relative permittivity, σ = conductivity and ρ = 1000 kg/m3 ) Table 4.
7.1.2 Liquid Depth The liquid level was during measurement 15cm ±0.5cm. Figure 8. Head-Tissue-Simulating-Liquid Test Report No: 0701FS18-01 ©2005 A Test Lab Techno Corp. Figure 9.
8. Measurement Process 8.1 Device and Test Conditions The Test Device was provided by IOGEAR, Inc. for this evaluation. The spatial peak SAR values were assessed for the lowest, middle and highest channels defined by Bluetooth ( Ch0 = 2402MHz, Ch39 = 2441MHz, Ch78 = 2480MHz) systems. The antenna(s), battery and accessories shall be those specified by the manufacturer. The battery shall be fully charged before each measurement and there shall be no external connections.
8.2 System Performance Check 8.2.1 Symmetric Dipoles for System Validation Construction Symmetrical dipole with l/4 balun enables measurement of feed point impedance with NWA matched for use near flat phantoms filled with head simulating solutions Includes distance holder and tripod adaptor Calibration Calibrated SAR value for specified position and input power at the flat phantom in head simulating solutions.
8.2.2 Validation Prior to the assessment, the system validation kit was used to test whether the system was operating within its specifications of ± 7%. The validation was performed at 2450MHz. Validation kit Mixture Type SAR1g [mW/g] SAR10g [mW/g] Head 54.4 25.32 Body 53.6 24.84 Date of Calibration D2450V2-SN712 Frequen cy (MHz) 2450 (Body) Feb, 16, 2006 Power (dBm) SAR1g SAR10g (mW/g) (mW/g) 250mW 13.6 6.
8.3 Dosimetric Assessment Setup 8.3.1 Headset Test Position – Body-Worn Body-Worn Configuration Body–worn operating configurations should be tested with the belt-clips and holsters attached to the device and positioned against a flat phantom in normal use configurations. Devices with a handset output should be tested with a handset connected to the device. Body-worn accessories may not always be supplied or available as options for some devices that are intended to be authorized for body-worn use.
8.3.2 Measurement Procedures The evaluation was performed with the following procedures: Surface Check: A surface check job gathers data used with optical surface detection. It determines the distance from the phantom surface where the reflection from the optical detector has its peak. Any following measurement jobs using optical surface detection will then rely on this value. The surface check performs its search a specified number of times, so that the repeatability can be verified.
8.4 Spatial Peak SAR Evaluation The DASY4 software includes all numerical procedures necessary to evaluate the spatial peak SAR values. Based on the Draft: SCC-34, SC-2, WG-2 - Computational Dosimetry, IEEE P1529/D0.0 (Draft Recommended Practice for Determining the Spatial-Peak Specific Absorption Rate (SAR) Associated with the Use of Wireless Handsets - Computational Techniques), a new algorithm has been implemented. The spatial-peak SAR can be computed over any required mass.
9. Measurement Uncertainty Measurement uncertainties in SAR measurements are difficult to quantify due to several variables including biological, physiological, and environmental. However, we estimate the measurement uncertainties in SAR to be less than ±27 %[8]. According to Std. C95.3[9], the overall uncertainties are difficult to assess and will vary with the type of meter and usage situation.
vi ci Standard Uncertainty ±1%(1-g) Veff 1 1 0.9 9 2 1 3.5 ∞ 3 0.5 1.9 ∞ Rectangular 3 0.5 3.9 ∞ 0% Rectangular 3 1 0 ∞ Boundary Effect 11.0 % Rectangular 3 1 6.4 ∞ Linearity 0.2dB Rectangular 3 1 2.7 ∞ Detection Limit 1.0 % Rectangular 3 1 0.6 ∞ Readout Electronics 1.0 % Normal 1 1.0 ∞ RF Ambient Conditions 3.0 % Rectangular 3 1 1.73 ∞ Probe Positioner Mech. Const. 0.4 % Rectangular 3 1 0.2 ∞ Probe Positioning 0.
10. SAR Test Results Summary 10.1 SAR Test Results-Bluetooth Body SAR Ambient: Temperature (℃): 22 ± 3 Relative HUMIDITY (%): MSL2450 Liquid Temperature (℃) : Depth of liquid (cm): 22.0 15 Probe S/N: 1530 40-70 Liquid: Mixture Type: Measurement: 1 Crest Factor: Frequency Battery Phantom Position Accessory SAR1g [mW/g] Power Drift (dB) Amb. Liq. Temp. Remark MHz CH 2402 0 N/A Flat N/A 0.150 -0.051 20.1 22.0 Front 2441 39 N/A Flat N/A 0.155 0.019 20.1 22.
Figure 11. Body SAR Test Setup (Flat Section)_Front Figure 12. Body SAR Test Setup (Flat Section)_Back Test Report No: 0701FS18-01 ©2005 A Test Lab Techno Corp.
10.2 Std. C95.1-1999 RF Exposure Limit Population Occupational Uncontrolled Controlled Exposure Exposure ( W/kg ) or (mW/g) ( W/kg ) or (mW/g) 1.60 8.00 0.08 0.40 1.60 8.00 4.00 20.00 Human Exposure Spatial Peak SAR* (head) Spatial Peak SAR** (Whole Body) Spatial Peak SAR*** (Partial-Body) Spatial Peak SAR**** (Hands / Feet / Ankle / Wrist ) Table 7. Safety Limits for Partial Body Exposure Notes: * The Spatial Peak value of the SAR averaged over any 1 gram of tissue.
11. Conclusion The SAR test values found for the portable mobile phone IOGEAR, Inc. Model (s) :GBU341WM,GBU341W1, GBU341W2,GBU341W3,GBU341W4,GBU341W5,GBU341W6,GBU341W7,GBU341W8,GBU341W9, GBU341P,GBU341 are below the maximum recommended level of 1.6 W/kg ( mW/g ). Test Report No: 0701FS18-01 ©2005 A Test Lab Techno Corp.
12. References [1] Std. C95.1-1999, “American National Standard safety levels with respect to human exposure to radio frequency electromagnetic fields, 300KHz to 100GHz”, New York. [2] NCRP, National Council on Radiation Protection and Measurements, “Biological Effects and Exposure Criteria for Radio frequency Electromagnetic Fields”, NCRP report NO. 86, 1986. [3] T. Schmid, O. Egger, and N.
Appendix A – System Performance Check See following Attached Pages for System Performance Check. Test Report No: 0701FS18-01 ©2005 A Test Lab Techno Corp.
Test Laboratory: A Test Lab Techno Corp. Date/Time: 1/22/2007 7:57:05 PM System Performance Check at 2450MHz_20070122 DUT: Dipole 2450 MHz; Type: D2450V2; Serial: D2450V2 - SN:712 Communication System: CW; Frequency: 2450 MHz;Duty Cycle: 1:1 Medium parameters used: f = 2450 MHz; ı = 1.97 mho/m; İr = 51.4; ȡ = 1000 kg/m3 Phantom section: Flat Section Measurement Standard: DASY4 (High Precision Assessment) DASY4 Configuration: z z z z z Probe: ET3DV6 - SN1530; ConvF(3.94, 3.94, 3.
Z-axis Plot of System Performance Check 1g/10g Averaged SAR SAR; Zoom Scan:Value Along Z, X=3, Y=3 14 12 mW/g 10 8 6 4 2 0 0.005 0.010 0.015 0.020 m 0.025 0.030 0.035 Body-Tissue-Simulating-Liquid 2.4GHz(20070122) Test Report No : 0701FS18-01 ©2005 A Test Lab Techno Corp.
Appendix B – SAR Measurement Data See following Attached Pages for SAR Measurement Data. Test Report No : 0701FS18-01 ©2005 A Test Lab Techno Corp.
Test Laboratory: A Test Lab Techno Corp. Date/Time: 1/22/2007 8:54:33 PM Flat_Bluetoot CH0__Front_15mm DUT: GBU341; Type: Bluetooth 2.0 EDR Enhanced Data Rate USB Adapter; FCC ID:QLEGBU341 Communication System: Bluetooth; Frequency: 2402 MHz;Duty Cycle: 1:1 Medium parameters used: f = 2402 MHz; ı = 1.94 mho/m; İr = 51.3; ȡ = 1000 kg/m3 Phantom section: Flat Section Measurement Standard: DASY4 (High Precision Assessment) DASY4 Configuration: z z z z z Probe: ET3DV6 - SN1530; ConvF(3.94, 3.94, 3.
Test Laboratory: A Test Lab Techno Corp. Date/Time: 1/22/2007 8:43:02 PM Flat_Bluetoot CH39__Front_15mm DUT: GBU341; Type: Bluetooth 2.0 EDR Enhanced Data Rate USB Adapter; FCC ID:QLEGBU341 Communication System: Bluetooth; Frequency: 2441 MHz;Duty Cycle: 1:1 Medium parameters used: f = 2441 MHz; ı = 1.97 mho/m; İr = 51.3; ȡ = 1000 kg/m3 Phantom section: Flat Section Measurement Standard: DASY4 (High Precision Assessment) DASY4 Configuration: z z z z z Probe: ET3DV6 - SN1530; ConvF(3.94, 3.94, 3.
Test Laboratory: A Test Lab Techno Corp. Date/Time: 1/22/2007 8:30:12 PM Flat_Bluetoot CH39_Back_15mm DUT: GBU341; Type: Bluetooth 2.0 EDR Enhanced Data Rate USB Adapter; FCC ID:QLEGBU341 Communication System: Bluetooth; Frequency: 2441 MHz;Duty Cycle: 1:1 Medium parameters used: f = 2441 MHz; ı = 1.97 mho/m; İr = 51.3; ȡ = 1000 kg/m3 Phantom section: Flat Section Measurement Standard: DASY4 (High Precision Assessment) DASY4 Configuration: z z z z z Probe: ET3DV6 - SN1530; ConvF(3.94, 3.94, 3.
Test Laboratory: A Test Lab Techno Corp. Date/Time: 1/22/2007 9:07:25 PM Flat_Bluetoot CH78__Front_15mm DUT: GBU341; Type: Bluetooth 2.0 EDR Enhanced Data Rate USB Adapter; FCC ID:QLEGBU341 Communication System: Bluetooth; Frequency: 2480 MHz;Duty Cycle: 1:1 Medium parameters used: f = 2480 MHz; ı = 2 mho/m; İr = 51.3; ȡ = 1000 kg/m3 Phantom section: Flat Section Measurement Standard: DASY4 (High Precision Assessment) DASY4 Configuration: z z z z z Probe: ET3DV6 - SN1530; ConvF(3.94, 3.94, 3.
Z-axis Plot of SAR Measurement 1g/10g Averaged SAR SAR; Zoom Scan:Value Along Z, X=2, Y=2 0.16 0.14 0.12 mW/g 0.10 0.08 0.06 0.04 0.02 0.00 0.005 0.010 0.015 0.020 m 0.025 0.030 0.035 SAR Measurement _ Left Cheek Blluetooth CH39(muscle 15mm) Test Report No : 0701FS18-01 ©2005 A Test Lab Techno Corp.
Appendix C – Calibration All of the instruments Calibration information are listed below. z Dipole _ D2450V2 SN:712 Calibration No.D2450V2-712_Feb06 z Probe _ ET3DV6 SN:1530 Calibration No.ET3-1530_Sep06 z DAE _ DAE4 SN:541 Calibration No.DAE4-541_Oct06 Test Report No : 0701FS18-01 ©2005 A Test Lab Techno Corp.