HAC T-Coil Appendix C

FCC ID: ZNF109C

Test Report

Download: PDF
FCCID_2628810

Calibration Laboratory of 4JA NU7 S Schweizerischer Kalibrierdienst E ,I/// Schmid & Partner Service suisse d‘étalonnage Engineering AG C Servizio svizzero di taratura 8wl L(rXYF S /, Zeughausstrasse 43, 8004 Zurich, Switzerland Swiss Calibration Service Alubals Accredited by the Swiss Accreditation Service (SAS) Accreditation No.: SCS 0108 The Swiss Accreditation Service is one of the sigr:atories to the EA Multiflateral Agreement for the recognition of calibration certificates Client UL CCS USA Certificate No: AM1DV3—3083_Jan15 CALIBRATION CERTIFICATE Object AM1DV3 — SN: 3083 Calibration procedure(s) QA CAL—24.v4 Calibration procedure for AM1D magnetic field probes and TMFS in the audio range Calibration date: January 15, 2015 This calibration certificate documents the traceability to national standards, which realize the physical units of measurements (S1). The measurements and the uncertainties with confidence probability are given on the following pages and are part of the certificate. All calibrations have been conducted in the closed laboratory facility: environment temperature (22 + 3)°C and humidity < 70%. Calibration Equipment used (M&TE critical for calibration) Primary Standards ID # Cal Date (Certificate No.) Scheduled Calibration Keithley Multimeter Type 2001 SN: 0810278 03—Oct—14 (No:15573) Oct—15 Reference Probe AM1DV2 SN: 1008 08—Jan—15 (No. AM1D—1008_Jan15) Jan—16 DAE4 SN: 781 12—Sep—14 (No. DAE4—781_Sep14) Sep—15 Secondary Standards ID # Check Date (in house) Scheduled Check AMCC 1050 01—Oct—13 (in house check Oct—13) Oct—16 AMMI Audio Measuring Instrument 1062 26—Sep—12 (in house check Sep—12) Sep—15 &fAh Name Function Signature Calibrated by: Leif Klysner Laboratory Technician Approved by: Katja Pokovic Technical Manager _eZ Issued: January 15, 2015 This calibration certificate shall not be reproduced except in full without written approval of the laboratory. Certificate No: AM1DV3—3083_Jan15 Page 1 of 3

[References [1] ANSI—C63.19—2007 American National Standard for Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing Aids. [2] ANSI—C63.19—2011 American National Standard, Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing Aids. (3] DASY5 manual, Chapter: Hearing Aid Compatibility (HAC) T—Coil Extension Description of the AM1D probe The AM1D Audio Magnetic Field Probe is a fully shielded magnetic field probe for the frequency range from 100 Hz to 20 kHz. The pickup coil is compliant with the dimensional requirements of [1+2]. The probe includes a symmetric low noise amplifier for the signal available at the shielded 3 pin connector at the side. Power is supplied via the same connector (phantom power supply) and monitored via the LED near the connector. The 7 pin connector at the end of the probe does not carry any signals, but determines the angle of the sensor when mounted on the DAE. The probe supports mechanical detection of the surface. The single sensor in the probe is arranged in a tilt angle allowing measurement of 3 orthogonal field components when rotating the probe by 120° around its axis. It is aligned with the perpendicular component of the field, if the probe axis is tilted nominally 35.3° above the measurement plane, using the connector rotation and sensor angle stated below. The probe is fully RF shielded when operated with the matching signal cable (shielded) and allows measurement of audio magnetic fields in the close vicinity of RF emitting wireless devices according to [1+2] without additional shielding. Handling of the item The probe is manufactured from stainless steel. In order to maintain the performance and calibration of the probe, it must not be opened. The probe is designed for operation in air and shall not be exposed to humidity or liquids. For proper operation of the surface detection and emergency stop functions in a DASY system, the probe must be operated with the special probe cup provided (larger diameter). Methods Applied and Interpretation of Parameters Coordinate System: The AM1D probe is mounted in the DASY system for operation with a HAC Test Arch phantom with AMCC Helmholtz calibration coil according to [3], with the tip pointing to "southwest" orientation. Functional Test: The functional test preceding calibration includes test of Noise level RF immunity (1kHz AM modulated signal). The shield of the probe cable must be well connected. Frequency response verification from 100 Hz to 10 kHz. Connector Rotation: The connector at the end of the probe does not carry any signals and is used for fixation to the DAE only. The probe is operated in the center of the AMCC Helmholtz coil using a 1 kHz magnetic field signal. Its angle is determined from the two minima at nominally +120° and — 120° rotation, so the sensor in the tip of the probe is aligned to the vertical plane in z—direction, corresponding to the field maximum in the AMCC Helmholtz calibration coil. Sensor Angle: The sensor tilting in the vertical plane from the ideal vertical direction is determined from the two minima at nominally +120° and —120°. DASY system uses this angle to align the sensor for radial measurements to the x and y axis in the horizontal plane. Sensitivity: With the probe sensor aligned to the z—field in the AMCC, the output of the probe is compared to the magnetic field in the AMCC at 1 kHz. The field in the AMCC Helmholtz coil is given by the geometry and the current through the coil, which is monitored on the precision shunt resistor of the coil. Certificate No: AM1DV3—3083_Jan15 Page 2 of 3

AM1D probe identification and configuration data Item AM1DV3 Audio Magnetic 1D Field Probe Type No SP AM1 001 BA Serial No 3083 Overall length 296 mm Tip diameter 6.0 mm (at the tip) Sensor offset 3.0 mm (centre of sensor from tip) Internal Amplifier 20 dB Manutfacturer / Origin Schmid & Partner Engineering AG, ZUurich, Switzerland Manutfacturing date May 28, 2010 Last calibration date January 21, 2014 Calibration data Connector rotation angle (in DASY system) 346.6 ° +/— 3.6 ° (k=2) Sensor angle (in DASY system) 0.10 ° +/— 0.5 ° (k=2) Sensitivity at 1 kHz (in DASY system) 0.00739 V / (A/m) +/— 2.2 % (Kk=2) The reported uncertainty of measurement is stated as the standard uncertainty of measurement multiplied by the coverage factor k=2, which for a normal distribution corresponds to a coverage probability of approximately 95%. Certificate No: AM1DV3—3083_Jan15 Page 3 of 3


Document Created: 2015-02-04 11:19:49
Document Modified: 2015-02-04 11:19:49
© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC