Probe Calibration

FCC ID: AEZSCP-310

RF Exposure Info

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FCCID_84033

Probe ET3DV5 SN:1368 Manufactured: December 1998 Calibrated: February 1999 Calibrated for System DASY3 Page 1 of 8

ET3DV5 SN:1368 Introduction The performance of all probes is measured before delivery. This includes an assessment of the characteristic parameters, receiving patterns as a function of frequency, frequency response and relative accuracy. Furthermore, each probe is tested in use according to a dosimetric assessment protocol. The sensitivity parameters (NormX, NormY, NormZ), the diode compresion parameter (DCP) and the conversion factor (ConvF) of the probe and some of the measurement diagrams are given in the following. The performance of the individual probes varies slightly due to tolerances arising from the manufacturing process. Since the lines are highly resistive (several MOhms), the offset and noise problem is greatly increased if signals in the low µV range are measured. Accurate measurement below 10 µW/g are possible if the following precautions are taken. 1) check the current grounding with the multimeter1, i.e., low noise levels, 2) compensate the current offset1, 3) use long integration time (approx. 10 seconds), 4) calibrate1 before each measurement, 5) persons should avoid moving around the lab while measuring. Since the field distortion caused by the supporting material and the sheath is quite high in the θ direction, the receiving pattern is poor in air. However, the Fig 1: Due to the field distortion caused by the distortion in tissue equivalent material is much less supporting material, the probe has two charac- because of its high dielectricity. In addition, the fields teristic directions, referred to as angle ψ and θ. induced in the phantoms by dipole structures close to the body are dominently parallel to the surface. Thus, the error due to non-isotropy is much better than 1 dB for dosimetric assessments. The probes are calibrated in the TEM cell ifi 110 although the field distribution in the cell is not very uniform and the frequency response is not very flat. To ensure consistency, a strict protocol is followed. The conversion factor (ConF) between this calibration and the measurement in the tissue simulation solution is performed by comparison with temperature measurements and computer simulations. This conversion factor is only valid for the specified tissue simulating liquids at the specified frequencies. If measurements have to be performed in solutions with other electrical properties or at other frequencies, the conversion factor has to be assessed by the same procedure. As the probes have been constructed with printed resistive lines on ceramic substrates (thick film technique), the probe is very delicate with respect to mechanical shocks. Attention: Do not drop the probe or let the probe collide with any solid object. Never let the robot move without first activating the emergency stop feature (i.e., without first turning the data acquisition electronics on). 1 Feature of the DASY Software Tool. Page 2 of 8

1 Feature of the DASY Software Tool. ET3DV5 SN:1368 DASY3 – Parameters of Probe: ET3DV5 SN:1368 Sensitivity in Free Space NormX 1.35 mV/(V/m) 2 NormY 1.29 mV/(V/m) 2 NormZ 1.46 mV/(V/m)2 Diode Compression DCP X 78 mV DCP Y 78 mV DCP Z 78 mV Sensitivity in Tissue Simulating Liquid 450 MHz ConvF X 6.2 extrapolated εr = 48 ± 5% σ= 0.50 ± 10%mho/m ConvF Y 6.2 extrapolated (brain tissue simulating liquid) ConvF Z 6.2 extrapolated 900 MHz ConvF X 5.8 ± 10% εr = 42.5 ± 5% σ= 0.86 ± 10%mho/m ConvF Y 5.8 ± 10% (brain tissue simulating liquid) ConvF Z 5.8 ± 10% 1500 MHz ConvF X 5.2 interpolated εr = 41 ± 5% ConvF Y 5.2 interpolated σ= 1.32 ± 10%mho/m ConvF Z 5.2 interpolated (brain tissue simulating liquid) 1800 MHz ConvF X 4.9 ± 10% εr = 41 ± 5% ConvF Y 4.9 ± 10% σ= 1.62 ± 10%mho/m ConvF Z 4.9 ± 10% (brain tissue simulating liquid) 835 MHz ConvF X 5.7 ± 10% εr = 56.2 ± 5% ConvF Y 5.7 ± 10% σ= 0.95 ± 10%mho/m ConvF Z 5.7 ± 10% (muscle tissue simulating liquid) 900 MHz ConvF X 5.6 ± 10% εr = 56.0 ± 5% ConvF Y 5.6 ± 10% σ= 0.97 ± 10%mho/m ConvF Z 5.6 ± 10% (muscle tissue simulating liquid) 1900 MHz ConvF X 4.3 ± 10% εr = 54.2 ± 5% ConvF Y 4.3 ± 10% σ= 1.85 ± 10%mho/m ConvF Z 4.3 ± 10% (muscle tissue simulating liquid) Sensor Offset Probe Tip to Sensor Center 2.7 mm Surface to Probe Tip ±0.2 mm 1.7± Page 3 of 8

ET3DV5 SN:1368 Receiving Pattern (φ), θ = 0° f = 30 MHz, TEM cell ifi110 f = 100 MHz, TEM cell ifi110 0 0 350 10 350 10 340 20 340 20 330 30 330 30 320 40 320 40 310 50 310 50 300 60 300 60 290 70 290 70 280 80 280 80 270 90 270 90 260 100 260 100 250 110 250 110 240 120 240 120 230 130 230 130 220 140 220 140 210 150 210 150 200 160 200 160 190 170 190 170 180 180 X Y Z Tot X Y Z Tot f = 300 MHz, TEM cell ifi110 f = 900 MHz, TEM cell ifi110 0 0 350 10 350 10 340 20 340 20 330 30 330 30 320 40 320 40 310 50 310 50 300 60 300 60 290 70 290 70 280 80 280 80 270 90 270 90 260 100 260 100 250 110 250 110 240 120 240 120 230 130 230 130 220 140 220 140 210 150 210 150 200 160 200 160 190 170 190 170 180 180 X Y Z Tot X Y Z Tot Page 4 of 8

ET3DV5 SN:1368 f = 1800 MHz, WG R22 f = 2500 MHz, WG R26 0 0 350 10 350 10 340 20 340 20 330 30 330 30 320 40 320 40 310 50 310 50 300 60 300 60 290 70 290 70 280 80 280 80 270 90 270 90 260 100 260 100 250 110 250 110 240 120 240 120 230 130 230 130 220 140 220 140 210 150 210 150 200 160 200 160 190 170 190 170 180 180 X Y Z Tot X Y Z Tot Isotropy Error (φ), θ = 0° 1.00 0.80 0.60 0.40 30 MHz error[dB] 0.20 100 MHz 0.00 300 MHz -0.20 900 MHz -0.40 1800 MHz -0.60 2500 MHz -0.80 -1.00 0 60 120 180 240 300 360 Page 5 of 8

ET3DV5 SN:1368 Frequency Response of E-Field ( TEM-Cell:ifi110, Waveguide R22, R26 ) 1.50 1.40 1.30 1.20 frequency response 1.10 1.00 0.90 0.80 0.70 0.60 0.50 0 500 1000 1500 2000 2500 3000 f [MHz] TEM R22 R26 Page 6 of 8

ET3DV5 SN:1368 Dynamic Range f(SARbrain) ( TEM-Cell:ifi110 ) 1.E+7 1.E+6 1.E+5 1.E+4 µV 1.E+3 1.E+2 1.E+1 1.E+0 0.0001 0.001 0.01 0.1 1. 10. 100. 3 mW/cm not compensated compensated 1 compensated 0 errror[dB] relative accuracy -1 not compensated -2 diode characteristic -3 0.0001 0.001 0.01 0.1 1 10 100 mW/cm3 Page 7 of 8

ET3DV5 SN:1368 Conversion Factor Assessment f = 900 MHz, WG R9 f = 1800 MHz, WG R22 0.30 2.50 0.25 2.00 SAR[mW/cm3] / W SAR[mW/cm3] / W 0.20 1.50 0.15 1.00 0.10 0.50 0.05 0.00 0.00 0 20 40 60 0 20 40 60 z[mm] z[mm] Analytical Measuremets Analytical Measuremets Receiving Pattern (φ) ( in brain tissue, z = 5 mm ) 1.00 0.80 0.60 0.40 error[dB] 0.20 0.00 -0.20 0 60 120 180 240 300 360 -0.40 -0.60 -0.80 -1.00 900 MHz 1800 MHz Page 8 of 8


Document Created: 2000-01-14 15:40:50
Document Modified: 2000-01-14 15:40:50
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