HAC T-Coil Test Report

FCC ID: ZNFUS991

Test Report

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FCCID_2599706

HAC T-COIL SIGNAL TEST REPORT FCC CFR47 PART 20.19 ANSI C63.19-2011 For GSM/WCDMA/CDMA/LTE Phone + Bluetooth, DTS/UNII a/b/g/n/ac & NFC FCC ID: ZNFUS991 Model Name: LG-US991, US991, LGUS991 Report Number: 15I20405-S2A Issue Date: 4/28/2015 Prepared for LG ELECTRONICS MOBILECOMM U.S.A., INC. 1000 Sylvan Avenue Englewood Cliffs, New Jersey 07632 Prepared by UL VERIFICATION SERVICES INC. 47173 BENICIA STREET FREMONT, CA 94538, U.S.A. TEL: (510) 771-1000 FAX: (510) 661-0888 NVLAP LAB CODE 200065-0

Report No.: 15I20405-S2A Issue Date: 4/28/2015 Revision History Rev. Date Revisions Revised By -- 4/21/2015 Initial Issue -- A 4/28/2015 Report revised based on reviewer’s comments: Hung Thai 1. Sec 5.1 Updated table Page 2 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 Table of Contents 1. Attestation of Test Results ............................................................................................................. 4 2. Test Methodology ........................................................................................................................... 5 3. Facilities and Accreditation ........................................................................................................... 5 4. Calibration and Uncertainty ........................................................................................................... 6 4.1. Measuring Instrument Calibration .............................................................................................. 6 4.2. Measurement Uncertainty .......................................................................................................... 7 5. Device Under Test........................................................................................................................... 8 5.1. Air Interfaces and Operating Mode ............................................................................................ 8 6. Test Procedures .............................................................................................................................. 9 7. Audio Level and Gain Measurements.......................................................................................... 11 8. T-coil Measurement Criteria ......................................................................................................... 12 8.1. Frequency Response ............................................................................................................... 12 8.2. Signal to Noise......................................................................................................................... 13 9. HAC (T-coil) Test Results ............................................................................................................. 14 9.1. With Normal Cover .................................................................................................................. 14 9.2. With Smart Cover .................................................................................................................... 14 9.3. Worst Case T-Coil Test Plot..................................................................................................... 15 Appendix .............................................................................................................................................. 16 A_15I20405v0 Setup Photo ................................................................................................................ 16 B_15I20405v0 Frequency Response & SNR Test Plots ..................................................................... 16 C_15I20405v0 Probe Cal. Certificates ................................................................................................ 16 Page 3 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 1. Attestation of Test Results Applicant Name LG ELECTRONICS MOBILECOMM U.S.A., INC. FCC ID ZNUS991 Model Name LG-US991, US991, LGUS991 Applicable Standards FCC 47 CFR § 20.19 ANSI C63.19-2011 Published RF exposure KDB procedures Device Category Portable Exposure Category General Population/Uncontrolled Exposure HAC Rating T3 Date Tested 4/15/2015 to 4/15/2015 Test Results Pass UL Verification Services Inc. tested the above equipment in accordance with the requirements set forth in the above standards. All indications of Pass/Fail in this report are opinions expressed by UL Verification Services Inc. based on interpretations and/or observations of test results. Measurement Uncertainties were not taken into account and are published for informational purposes only. The test results show that the equipment tested is capable of demonstrating compliance with the requirements as documented in this report. Note: The results documented in this report apply only to the tested sample, under the conditions and modes of operation as described herein. This document may not be altered or revised in any way unless done so by UL Verification Services Inc. and all revisions are duly noted in the revisions section. Any alteration of this document not carried out by UL Verification Services Inc. will constitute fraud and shall nullify the document. This report must not be used by the client to claim product certification, approval, or endorsement by NVLAP, NIST, any agency of the Federal Government, or any agency of any government (NIST Handbook 150, Annex A). This report is written to support regulatory compliance of the applicable standards stated above. Approved & Released By: Prepared By: Bobby Bayani Hung.Thai Senior Engineer Laboratory Technician UL Verification Services Inc. UL Verification Services Inc. Page 4 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 2. Test Methodology The tests documented in this report were performed in accordance with ANSI C63.19-2011 Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing Aids and FCC published procedure KDB 285076 D01 HAC Guidance v04 and KDB 285076 D02 T-Coil testing for CMRS IP v01r01. 3. Facilities and Accreditation The test sites and measurement facilities used to collect data are located at 47173 Benicia Street 47266 Benicia Street SAR Lab C SAR Lab 2 UL Verification Services Inc. is accredited by NVLAP, Laboratory Code 200065-0 Page 5 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 4. Calibration and Uncertainty 4.1. Measuring Instrument Calibration The measuring equipment used to perform the tests documented in this report has been calibrated in accordance with the manufacturers’ recommendations, and is traceable to recognized national standards. Cal. Due date Name of Equipment Manufacturer Type/Model Serial Number MM DD Year Robot - Six Axes Stäubli TX90 XL N/A N/A Robot Remote Control Stäubli CS8C N/A N/A DASY5 Measurement Server SPEAG SEUMS001BA 1041 N/A Probe Alignment Unit SPEAG LB (V2) 261 N/A Audio Magnetic Measuring Ins.I SPEAG AMMI 1127 N/A Coordinating SystemI SPEAG AMCC N/A N/A ABM Probe SPEAG AM1DV3 3083 1 15 2016 Data Acquisition Electronics SPEAG DAE3 427 1 14 2016 Radio Communication Tester R&S CMU 200 838114/032 7 30 2015 Radio Communication Tester* R&S CMU 500 140259 7 25 2015 Page 6 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 4.2. Measurement Uncertainty Measurement Uncertainty for Audio Band Magnetic Measurement Uncertainty Probe c c Std. Unc. Error Description values (%) Dist. Div. AMB1 AMB2 AMB1 (%) AMB2 (%) Probe Sensitivity Reference level 3.0 N 1 1.00 1.00 3.00 3.00 AMCC geometry 0.4 R 1.73 1.00 1.00 0.23 0.23 AMCC current 0.6 R 1.73 1.00 1.00 0.35 0.35 Probe positioning during calibration 0.1 R 1.73 1.00 1.00 0.06 0.06 Noise contribution 0.7 R 1.73 0.01 1.00 0.01 0.40 Frequency slope 5.9 R 1.73 0.10 1.00 0.34 3.41 Probe System Repeatability / drift 1.0 R 1.73 1.00 1.00 0.58 0.58 Linearity / Dynamic range 0.6 R 1.73 1.00 1.00 0.35 0.35 Acoustic noise 1.0 R 1.73 0.10 1.00 0.06 0.58 Probe angle 2.3 R 1.73 1.00 1.00 1.33 1.33 Spectral processing 0.9 R 1.73 1.00 1.00 0.52 0.52 Integration time 0.6 N 1.00 1.00 5.00 0.60 3.00 Field disturbation 0.2 R 1.73 1.00 1.00 0.12 0.12 Test Signal Reference signal spectral response 0.6 R 1.73 0.00 1.00 0.00 0.35 Positioning Probe positioning 1.9 R 1.73 1.00 1.00 1.10 1.10 Phantom positioning 0.9 R 1.73 1.00 1.00 0.52 0.52 EUT positioning 1.9 R 1.73 1.00 1.00 1.10 1.10 External Contributions RF interference 0.0 R 1.73 1.00 1.00 0.00 0.00 Test signal variation 2.0 R 1.73 1.00 1.00 1.15 1.15 Combined Std. Uncertainty (ABM field) 4.02 6.08 Expanded Std. Uncertainty (%) 8.04 12.15 Notes for table 1. N - Nomal 2. R - Rectangular 3. Div. - Divisor used to obtain standard uncertainty Page 7 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 5. Device Under Test Normal operation Held to head Back Cover ☒ Normal Battery Cover ☒ With Smart Cover 5.1. Air Interfaces and Operating Mode Voice over Additional Concurrent digital Wi-Fi Air- Bands Type HAC Simultaneous but not GSM HAC Tested Transport Low Interface (MHz) Transport Tested Tested Power or not Tested OTT Power Reduction Capability GSM 850 / 1900 VO Yes Yes – Wi-Fi/BT Not tested1 NA NA NA GPRS 850 / 1900 DT No Yes – Wi-Fi/BT NA Yes NA NA EGPRS 850 / 1900 DT No Yes – Wi-Fi/BT NA Yes NA NA W-CDMA II / V VO Yes Yes - Wi-Fi/BT Not tested1 NA NA NA R99 HSPA II / V DT No Yes – Wi-Fi/BT NA Yes NA NA CDMA BC 0 / 1 VO Yes Yes – Wi-Fi/BT Not tested1 NA NA NA EVDO BC 0 / 1 DT No Yes – Wi-Fi/BT NA NA NA NA 2 / 4 / 5 / 12 / 13 / 17/ LTE - FDD VD No2 Yes – Wi-Fi/BT Not tested1 Yes NA NA 25 Wi-Fi 2400 DT No Yes – WWAN Not tested1 NA No NA 1 Wi-Fi 5000 DT No Yes – WWAN Not tested NA No NA BT 2400 DT No Yes – WWAN Not tested1 NA NA NA Type Transport Note: VO = Voice only 1. No concurrent mode was found to be the Worst Case mode DT = Digital Transport 2. No associated T-Coil measurement has been made in VD = CMRS and Data transport (HAC Tested) accordance with 285076 D02 T-Coil testing for CMRS IP from October 2013 TCB workshop. Page 8 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 6. Test Procedures ANSI C63.19-2011, Section 7 This document describes the procedures used to measure the ABM (T-Coil) performance of the WD. In addition to measuring the absolute signal levels, the A-weighted magnitude of the unintended signal shall also be determined. In order to assure that the required signal quality is measured, the measurement of the intended signal and the measurement of the unintended signal must be made at the same location for all measurement positions. In addition, the RF field strength at each measurement location must be at or below that required for the assigned category. Measurements shall not include undesired properties from the WD’s RF field; therefore, use of a coaxial connection to a base station simulator or non-radiating load may be necessary. However, even then with a coaxial connection to a base station simulator or non-radiating load there may still be RF leakage from the WD, which may interfere with the desired measurement. Pre-measurement checks should be made to avoid this possibility. All measurements shall be done with the WD operating on battery power with an appropriate normal speech audio signal input level given in Table 7.1. If the device display can be turned off during a phone call then that may be done during the measurement as well. Measurements shall be performed at two locations specified in A.3, with the correct probe orientation for a particular location, in a multistage sequence by first measuring the field intensity of the desired T-Coil signal (ABM1) that is useful to a hearing aid T-Coil. The undesired magnetic components (ABM2) must be measured at the same location as the desired ABM or T-Coil signal (ABM1), and the ratio of desired to undesired ABM signals must be calculated. For the perpendicular field location, only the ABM1 frequency response shall be determined in a third measurement stage. The flow chart in Figure 7.3 illustrates this three-stage, two orientation process. 1 2 The following steps summarize the basic test flow for determining ABM1 and ABM2 . These steps assume that a sine wave or narrowband 1/3 octave signal can be used for the measurement of ABM1. a. A validation of the test setup and instrumentation may be performed using a TMFS or Helmholtz coil. Measure the emissions and confirm that they are within the specified tolerance. b. Position the WD in the test setup and connect the WD RF connector to a base station simulator or a non- radiating load as shown in Figure 7.1 or Figure 7.2. Confirm that equipment that requires calibration has been calibrated, and that the noise level meets the requirements given in 7.3.1. c. The drive level to the WD is set such that the reference input level specified in Table 7.1 is input to the base station simulator (or manufacturer’s test mode equivalent) in the 1 kHz, 1/3 octave band. This drive level shall be used for the T-Coil signal test (ABM1) at f = 1 kHz. Either a sine wave at 1025 Hz or a voice- like signal, band-limited to the 1 kHz 1/3 octave, as defined in 7.4.2, shall be used for the reference audio signal. If interference is found at 1025 Hz an alternative nearby reference audio signal frequency may be used.46 The same drive level will be used for the ABM1 frequency response measurements at each 1/3 octave band center frequency. The WD volume control may be set at any level up to maximum, provided that a signal at any frequency at maximum modulation would not result in clipping or signal overload. d. Determine the magnetic measurement locations for the WD device (A.3), if not already specified by the manufacturer, as described in 7.4.4.1.1 and 7.4.4.2. e. At each measurement location, measure and record the desired T-Coil magnetic signals (ABM1 at fi) as described in 7.4.4.2 in each individual ISO 266-1975 R10 standard 1/3 octave band. The desired audio band input frequency (fi) shall be centered in each 1/3 octave band maintaining the same drive level as determined in item c) and the reading taken for that band. Equivalent methods of determining the frequency response may also be employed, such as fast Fourier transform (FFT) analysis using noise excitation or input–output comparison using simulated speech. The full-band integrated or half-band integrated probe output, as specified in D.9, may be used, as long as the appropriate calibration curve is applied to the measured result, so as to yield an accurate measurement of the field magnitude. (The resulting measurement shall be an accurate measurement in dB A/m.) 1 Audio Band Magnetic signal - desired (ABM1): Measured quantity of the desired magnetic signal 2 Audio Band Magnetic signal - undesired (ABM2): Measured quantity of the undesired magnetic signal, such as interference from battery current and similar non-signal elements. Page 9 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 All measurements of the desired signal shall be shown to be of the desired signal and not of an undesired signal. This may be shown by turning the desired signal ON and OFF with the probe measuring the same location. If the scanning method is used the scans shall show that all measurement points selected for the ABM1 measurement meet the ambient and test system noise criteria in 7.3.1. f. At the measurement location for each orientation, measure and record the undesired broadband audio magnetic signal (ABM2) as specified in 7.4.4.4 with no audio signal applied (or digital zero applied, if appropriate) using A-weighting and the half-band integrator. Calculate the ratio of the desired to undesired signal strength (i.e., signal quality). g. Obtain the data from the postprocessor, SEMCAD, and determine the category that properly classifies the signal quality based on Table 8.5. Test Setup Diagram USB USB AMMI Audio Coil Coil Probe PC Out Out In In EUT Audio In/Out Coil Monitor AMCC Base Station Coil In ----- For Cal Gain Page 10 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 7. Audio Level and Gain Measurements Establish a call and obtain the 1 kHz speech output signal at 3.14 dBm0 from the CMU200 using the Network Bitstream “Decoder Cal.” Perform a measurement job to measure the RMS Coil Signal. Note the voltage level and calculate the desired level for GSM/W-CDMA and CDMA, which are, according to ANSI C63.19-2011 Section 7.4.2.1, -16 dBm0 and -18 dBm0 respectively. To determine the appropriate audio level, use the following equations, where x dBm0 is the measured RMS Coil Signal: GSM/W-CDMA Audio Level(-16 dBm0) = ((-16 dBm0) - (3.14 dBm0)) + x dBv Audio Signal Signal Measured (dBm0) Type Audio Level 3.14 -2.54 1 kHz sine -16 -21.68 Change the Network Bitstream from “Decoder Cal” to “Encoder Cal.” Similarly, run a measurement job with the “Encoder Cal” codec active and set the Gain in the measurement job to 10. Note the RMS Coil signal. To calculate the gain, the following equation was used, where y dBm0 is the measured RMS Coil Signal for the “Encoder Cal” measurement: GSM/W-CDMA Gain(-16 dBm0) = 10((Audio Lev el-16 dBm0 – y dBm0) / 20) * 10 Audio Signal Signal Measured Measured Calculated (dBm0) Type Audio Level Coil Signal Gain -16 1 kHz sine -21.68 -19.34 7.64 Finally, to determine the required gain for testing, we multiply the resultant gain with the required gain to achieve an approximate level of a 1 kHz sine signal. RESULTS Audio Signal Signal Required Gain Calculated Adjusted (dBm0) Type Factor Gain Gain* 48k_voice_1kHz 4.33 7.64 33.08 -16 48k_voice_300-3000 8.48 7.64 64.79 * An adjustment was made to -16 dBm0’s 48k_voice_300-3000. When the gain is set to 64.79, the Audio Level measured is -21.81 dBV. The gain was manually adjusted until the Audio Level matched the original. The gain used for this project is 65.76. Page 11 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 8. T-coil Measurement Criteria 8.1. Frequency Response The frequency response of the axial component of the magnetic field, measured in 1/3 octave bands, shall follow the response curve, over the frequency range 300 Hz to 3000 Hz. Figure 8.1 and Figure 8.2 provide the boundaries for the specified frequency. These response curves are for true field strength measurements of the T-Coil signal. Thus the 6 dB/octave probe response has been corrected from the raw readings. Page 12 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 8.2. Signal to Noise This specifies the signal-to-noise quality requirement for the intended T-Coil signal from a WD. The worst signal to noise of the two T-Coil signal measurements, as determined in Clause 7, shall be used to determine the T-Coil mode category per Table 8.5. Only the RF immunity of the hearing aid is measured in T-Coil mode. It is assumed that a hearing aid can have no immunity to an interference signal in the audio band, which is the intended reception band for this mode. So, the only criterion that can be measured is the RF immunity in T-Coil Mode. This is measured using the same procedure as for the audio coupling mode and at the same levels as specified in 6.4. Measurement locations and reference plane to be used for the T-coil measurements Page 13 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 9. HAC (T-coil) Test Results 9.1. With Normal Cover ABM1 Channel and Probe Frequency BWC Factor ABM SNR Mode ≥ -16 dB T-Rating Frequency Orientation Response (dB) (dB) (A/m) GSM850 z (axial) 2.72 0.16 26.79 T3 190 Voice Coder Pass 836.6 MHz Speechcodec Low y (Transversal) -6.98 0.16 40.46 T4 GSM1900 z (axial) 3.40 0.16 30.12 T4 661 Voice Coder Pass 1880 MHz Speechcodec Low y (Transversal) -6.59 0.16 40.21 T4 W-CDMA Band V z (axial) 3.54 0.16 49.01 T4 4183 Voice Coder Pass 836.6 MHz Speechcodec Low y (Transversal) -4.71 0.16 47.10 T4 W-CDMA Band II z (axial) 3.40 0.16 48.09 T4 9400 Voice Coder Pass 1880 MHz Speechcodec Low y (Transversal) -4.67 0.16 46.97 T4 CDMA2000 BC0 z (axial) -0.25 0.16 46.78 T4 384 RC1 / SO3 Pass 836.52 MHz Voice Coder: 8K EVRC Low y (Transversal) -8.96 0.16 43.36 T4 CDMA2000 BC1 z (axial) -0.21 0.16 44.74 T4 600 RC1 / SO3 Pass 1880 MHz Voice Coder: 8K EVRC Low y (Transversal) -9.48 0.16 42.88 T4 9.2. With Smart Cover ABM1 Channel and Probe Frequency BWC Factor ABM SNR Mode ≥ -16 dB T-Rating Frequency Orientation Response (dB) (dB) (A/m) GSM850 z (axial) 0.50 0.16 26.26 T3 190 Voice Coder Pass 836.6 MHz Speechcodec Low y (Transversal) -10.46 0.16 37.39 T4 GSM1900 z (axial) 0.22 0.16 29.51 T3 661 Voice Coder Pass 1880 MHz Speechcodec Low y (Transversal) -8.60 0.16 39.96 T4 W-CDMA Band V z (axial) 0.49 0.16 47.20 T4 4183 Voice Coder Pass 836.6 MHz Speechcodec Low y (Transversal) -7.36 0.16 45.76 T4 W-CDMA Band II z (axial) 0.54 0.16 46.60 T4 9400 Voice Coder Pass 1880 MHz Speechcodec Low y (Transversal) -7.39 0.16 46.23 T4 CDMA2000 BC0 z (axial) -4.21 0.16 44.86 T4 384 RC1 / SO3 Pass 836.52 MHz Voice Coder: 8K EVRC Low y (Transversal) -11.45 0.16 41.69 T4 CDMA2000 BC1 z (axial) -3.49 0.16 44.18 T4 600 RC1 / SO3 Pass 1880 MHz Voice Coder: 8K EVRC Low y (Transversal) -11.90 0.16 41.88 T4 Note: The radial longitudinal (x axis) measurements are no longer required per ANSI C63.19-2011 Page 14 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 9.3. Worst Case T-Coil Test Plot Test Laboratory: UL Verification Services Inc. SAR Lab C Date: 4/15/2015 W-CDMA Band V Communication System: UID 0, UMTS-FDD (WCDMA) (0); Frequency: 836.6 MHz; Duty Cycle: 1:1 Phantom section: TCoil Section DASY5 Configuration: - Probe: AM1DV3 - 3083; ; Calibrated: 1/15/2015 - Sensor-Surface: 0mm (Fix Surface) - Electronics: DAE3 Sn427; Calibrated: 1/14/2015 - Phantom: HAC Test Arch with AMCC; Type: SD HAC P01 BB - Measurement SW: DASY52, Version 52.8 (7);SEMCAD X Version 14.6.10 (7164) T-Coil scan (scan for ANSI C63.19-2007 & 2011 compliance)/General Scans ch 4183/z (axial) 4.2mm 50 x 50/ABM Interpolated SNR(x,y,z) (121x121x1): Interpolated grid: dx=1.000 mm, dy=1.000 mm Signal Type: Audio File (.wav) 48k_voice_1kHz_1s.wav Output Gain: 36.33 Measure Window Start: 300ms Measure Window Length: 1000ms BWC applied: 0.15 dB Device Reference Point: 0, 0, -6.3 mm Cursor: ABM1/ABM2 = 49.01 dB ABM1 comp = 3.54 dBA/m BWC Factor = 0.15 dB Location: -2.9, 0.8, 3.7 mm 0 dB = 1.000 = 0.00 dB Page 15 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.

Report No.: 15I20405-S2A Issue Date: 4/28/2015 Appendix Refer to separated files for the following appendixes A_15I20405v0 Setup Photo B_15I20405v0 Frequency Response & SNR Test Plots C_15I20405v0 Probe Cal. Certificates END OF REPORT Page 16 of 16 UL Verification Services Inc. Doc. No.: 1.0 This report shall not be reproduced without the written approval of UL Verification Services Inc.


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