HAC T-Coil 10.2. Calibration Certificate - Magnetic Field Probe AM1DV3 - SN 309

FCC ID: BCG-E2817A

Test Report

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FCCID_2349008

Calibration Laboratory of                                                                                          Schweizerischer Kalibrierdienst
Schmid & Partner                                                                                                   Service suisse d‘étalonnage
  Engineering AG                                                                                                   Servizio svizzero di taratura
Zeughausstrasse 43, 8004 Zurich, Switzerland                                                                       Swiss Calibration Service



Accredited by the Swiss Accreditation Service (SAS)                                             Accreditation No.: SCS 108
The Swiss Accreditation Service is one of the signatories to the EA
Multilateral Agreement for the recognition of calibration certificates


Client       UL CCS USA                                                                         Certificate No: AM1DV3—3092_Jul13

|CALIBRATION CERTIFICATE                                                                                                                             mraief
 Object                                AM1DV3 — SN: 3092


 Calibration procedure(s)              QA CAL—24.v3
                                       Calibration procedure for AM1D magnetic field probes and TMFS in the
                                       audio range

 Calibration date:                     July 25, 2013




 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               02—Oct—12 (No:12728)                                    Oct—13
 Reference Probe AM1DV2                 SN: 1008                  10—Jan—13 (No. AM1D—1008_Jan13)                         Jan—14
 DAE4                                   SN: 781                   03—Jun—13 (No. DAE4—781_Jun13)                          Jun—14



 Secondary Standards                    ID #                      Check Date (in house)                                   Scheduled Check
 AMCC                                   1050                      12—Oct—11 (in house check Oct—11)                       Oct—13
 AMMI Audio Measuring Instrument        1062                      26—Sep—12 (in house check Sep—12)                       Sep—14




                                                                                                                               ,\‘I

                                        Name                                   Function                                   Si   at!u e
 Calibrated by:                         Claudio Leubler                        Laboratory Technician                                  \        \’\

                                                                                                                                          _7

 Approved by:                           Fin Bomholt                            Deputy Technical Manager        —{f@M
                                                                                                                      (


                                                                                                                          Issued: July 25, 2013
 This calibration certificate shall not be reproduced except in full without written approval of the laboratory.



Certificate No: AM1D—3092_Jul13                                       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]       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].
      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] 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

a«    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 [2], 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.
a     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 colil.
=     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: AM1D—3092_Jul13                      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                     3092


    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


    Manufacturer / Origin         Schmid & Partner Engineering AG, ZUurich, Switzerland
    Manufacturing date            March 03, 2011
    Last calibration date         June 14, 2012




Calibration data


Connector rotation angle          (in DASY system)         275.8 °             +/— 3.6 ° (k=2)


Sensor angle                      (in DASY system)         0.96 °              +/— 0.5 ° (k=2)


Sensitivity at 1 kHz              (in DASY system)         0.00733 V / (A/m)   +/— 2.2 % (k=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: AM1D—3092_Jul13                         Page 3 of 3



Document Created: 2019-06-06 20:27:16
Document Modified: 2019-06-06 20:27:16

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