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PCB Piezotronics Larson Davis AEC201 Technical Reference Manual

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Larson Davis
AEC201 Ear Simulator
Technical Reference Manual

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Summary of Contents for PCB Piezotronics Larson Davis AEC201

  • Page 1 Larson Davis AEC201 Ear Simulator Technical Reference Manual...
  • Page 2 Larson Davis AEC201 Ear Simulator Reference Manual AEC201.01 Rev B...
  • Page 3 Copyright Copyright 2016 by PCB Piezotronics, Inc. This manual is copyrighted, with all rights reserved. The manual may not be copied in whole or in part for any use without prior written consent of PCB Piezotronics, Inc. Trademarks ® is a registered trademark of PCB, Inc.

  • Page 4: Table Of Contents

    Table of Contents Chapter 1 Introduction The AEC201 Ear Simulator ................1-1 Components and Construction ................1-2 AEC201-A ......................1-2 Standards ......................1-4 Applications ...................... 1-4 Chapter 2 Inspection and Assembly Assembly......................2-2 AEC201 Ear Simulator SPL Calibration ............2-4 Chapter 3 Testing Transducers Audiometer Transducer Test Configurations ............

  • Page 6: Chapter 1 Introduction

    Simulator. The AEC201 Ear Simulator FIGURE 1-1 AEC201 with earphone The Larson Davis AEC201 Ear Simulator covers the frequency range from 20 to 10000 Hz, which has been designed for the calibration of supra-aural earphones used in audiometry and telephonometry. The AEC201 allows accurate and repeatable measurements within its frequency range.

  • Page 7: Components And Construction

    Components and Construction The AEC201 is composed of three cavities coupled by precise acoustical impedances. The main cavity houses a 1/ 2” 377B13 pressure microphone, which is connected to the preamplifier inserted in the base of the coupler. Major mechanical parts are made of non-magnetic stainless steel for hardness, finish and long lasting quality, see FIGURE 1- 2.
  • Page 8 Main Weight Earphone Retainer Ring Earphone Conical Ring Coupler Microphone Preamplifier Base Vibration Isolation Pad Type 2 Adaptor Type 1 Adaptor Weight Bag FIGURE 1-2 AEC201 Components Earphone, microphone, preamplifier and Type 2 adaptor are optional components not supplied with the AEC201. AEC201 Ear Simulator AEC201-A...

  • Page 9: Standards

    See Type 1 and Type 2 Adaptors in FIGURE 1-2. Applications The Larson Davis AEC201 Ear Simulator may be used for a number of precision electro-acoustic test applications, such as audiometer calibration and earphone frequency response production testing.
  • Page 10 Such a system may consist of the following components: • Test earphone and adapter for AEC201 • Larson Davis AEC201 Ear Simulator • Cable from earphone connector to output of source • Precision amplifier (if required) •...
  • Page 11 AEC201 Ear Simulator Applications...

  • Page 12: Inspection And Assembly

    C H A P T E R Inspection and Assembly This chapter describes the components and assembly of the AEC201 Ear Simulator. The AEC201 is available in a variety of configurations. You may have purchased the ear simulator alone, with various accessories, or within a complete audiometer test system.

  • Page 13: Assembly

    Assembly Step 1 Place the cushioned vibration isolation pad on a table or other stable surfaces near the audiometer system. Step 2 Visually inspect the coupler for gouges, scratches and dents which may affect the measurement especially around the lip which will be in contact with the test earphone.
  • Page 14 Step 3 Working over the vibration isolation pad Note: When it is necessary to remove the microphone be careful to remove (ACC001), install the microphone 377B13 on the the entire microphone and not just center of the base. The microphone should install the grid cap.

  • Page 15: Aec201 Ear Simulator Spl Calibration

    Step 6 Connect the EXC010 cable to the Model 831 Sound Level Meter. The coupler is now ready for level calibration. AEC201 Ear Simulator SPL Calibration Level calibration is performed using a Larson Davis CAL200 precision calibrator. It offers a level of 114 dB with an accuracy of +/-0.2 dB at 1 kHz.
  • Page 16 Do not hold the calibrator during calibration. FIGURE 2-5 CAL200 being activated on AEC201 Step 4 Activate the calibrator and verify the stability of the indication on the measurement system. See FIGURE 2-5. Step 5 Follow the instructions for calibration of the Model 831 Sound Level Meter found in it’s Technical Reference manual.
  • Page 17 AEC201 Ear Simulator AEC201 Ear Simulator SPL Calibration...

  • Page 18: Testing Transducers

    C H A P T E R Testing Transducers This chapter describes the testing of audiometer transducers using the AEC201. Audiometer Transducer Test Configurations Please contact Larson Davis if you The table below lists some typical audiometer transducers, have any system assembly questions many of which are covered in specifications such as not covered in this manual.

  • Page 19: Testing Supra-Aural Earphones Using Aec201

    Testing Supra-Aural Earphones using AEC201 The following steps are suggested for audiometer calibration using AEC201. Step 1 Assemble the coupler as described in Chapter 2 "Assembly" on page 2-2. The base should rest on the vibration isolation pad so that ambient noise and vibration will be minimized.
  • Page 20 Black Ring Installed FIGURE 3-2 Black Conical ring installed on AEC201 Step 5 For earphones with a very stiff ear cap, use a thin, soft ring of rubber sheet on the contact area between coupler and earphone. Step 6 Center the test earphone on the coupler. Lower the black earphone retainer ring over the earphone, holding the earphone cable in line with the notch.

  • Page 21: Testing Circumaural Earphones Using Aec201

    Step 7 Lower the main weight on top of the earphone. See FIGURE 3-4. FIGURE 3-4 Main Weight on headphone The AEC201 ear simulator and earphone are now ready for measurement. Testing Circumaural Earphones using AEC201 Circumaural earphones are available for audiometers using extended high-frequencies from 8000 Hz to 16000 Hz.
  • Page 22 performed when the following environmental conditions are met. Condition ANSI S3.6-2004 IEC 60318-1:2009 (Annex C) Clause 6 Calibration Ambient Pressure 98 to 104 kPa 98.3 to 104.3 kPa Temperature 18 to 26 degrees C 20 to 26 degrees C Relative Humidity 30 to 80% RH 30 to 70% RH Any conditions not met...
  • Page 23 FIGURE 3-5 AEC201 with Type 1 adapter installed Step 5 For earphones designed to be calibrated with a Type 2 adapter such as the KOSS HV/1A, use the optional AEC201-2 Type 2 adapter. Do not use the black conical ring. See FIGURE 3-6. FIGURE 3-6 Type 2 adapter installed on AEC201 Step 6 Center the earphone on the coupler or place it as recommended by the earphone manufacturer if the...
  • Page 24 Step 7 ANSI S3.6-2004 requires a static force of 9 to 10 N on the earphone during calibration. Use the weight bag. See FIGURE 3-7. FIGURE 3-7 Sennheiser earphone and weight being installed on AEC201 The coupler and earphone are now ready for measurement. Testing Circumaural Earphones using AEC201 AEC201 Ear Simulator...
  • Page 25 AEC201 Ear Simulator Testing Circumaural Earphones using AEC201...

  • Page 26: Appendix A Specifications

    A P P E N D I X Specifications Standards Fulfills the requirements of: • International Standard IEC 60318-1:2009, Simulators of human head and ear - Part 1 ear simula- tor for the measurement of supra-aural and circumaural earphones when used with Model PCB 377B13 1/2”...

  • Page 27: Physical

    Physical AEC201 Coupler and Base Nominal acoustic volumes 2487 mm , 1819 mm , 7438 mm Microphone mounting thread 11.7 mm - 60 UNS (0.4606-60 UNS-2A) Preamplifier mounting thread 11.7 mm - 60 UNS (0.4606.60 UNS-2B) Maximum diameter 82 mm (3.2 in) Height 50.9 mm (2.0 in) without mass and earphone retainer,...

  • Page 28: User Replaceable Parts

    Calibration Environmental Conditions Reference ambient pressure 101.3 kPa ± 3.0 kPa Reference temperature 23 °C ± 3 °C (73.4 °F ± 5.4 °F) Reference relative humidity 50% RH ± 20% RH Transfer Impedance Temperature sensitivity +0.04 dB/°C typical (18 °C to 28 °C) Transfer Impedance Static pressure sensitivity +0.10 dB/kPa at 400 Hz typical +0.07 dB/kPa at 1 kHz typical +0.11 dB/kPa at 3 kHz typical...

  • Page 29: Frequency Response

    Frequency Response Typical Transfer impedance and Sensitivity of the AEC201 are presented as a function of frequency on the following pages. Artificial Ear Transfer Impedance Larson Davis Model: AEC201 S/N: 0101 Frequency (Hz) Transfer Impedance (reference: 1 Pa·s/m^3) Lower Upper Frequency Impedance Error...
  • Page 30 Artificial Ear Sensitivity Larson Davis Model: AEC201 S/N: 0101 Frequency (Hz) Frequency Response (reference to 1 kHz) Lower Upper Frequency Sensitivity Error Limit Limit Uncertainty (Hz) (dB) (dB) (dB) (dB) (dB) -8.205 0.294 -10.00 -7.00 0.33 -7.695 0.293 -9.49 -6.49 0.33 -6.744 0.267...

  • Page 31: Static Pressure Response

    Static Pressure Response Typical Transfer Impedance and Sensitivity of the AEC201 are presented as a function of static pressure in the following figures. LD AEC201 Ear Simulator Transfer Impedance Change with static Pressure Static Pressure (kPa) 101.3 96.4 91.3 86.3 Freq (Hz) (dB)
  • Page 32 AEC201 Transfer Impedance Static Pressure Sensitivity 1000 10000 Frequency (Hz) 101.3 kPa 96.4 kPa 91.3 kPa 86.3 kPa FIGURE A-11 Transfer Impedance change with Static Pressure Graph AEC201 Manual Static Pressure Response...
  • Page 33 LD AEC201 Ear Simulator Sensitivity Change with static Pressure Static Pressure (kPa) 101.3 96.4 91.3 86.3 Freq (Hz) (dB) (dB) (dB) (dB) -8.40 -8.34 -8.32 -8.29 -7.92 -7.87 -7.73 -7.64 -7.01 -6.84 -6.69 -6.49 -5.32 -5.18 -5.02 -4.82 -2.84 -2.78 -2.73 -2.67 -0.30...
  • Page 34 AEC201 Sensitivity Change with Static Pressure 1000 10000 Frequency (Hz) 101.3 kPa 96.4 kPa 91.3 kPa 86.3 kPa FIGURE A-13 Sensitivity change with Static Pressure Graph AEC201 Manual Static Pressure Response...

  • Page 35: Appendix B Calibration Of The Ear Simulator

    A P P E N D I X Calibration of the Ear Simulator Larson Davis provides calibration services, which is what we recommend. The procedure below is documented here as required by IEC 603181-1:2009 clause 6.2. This appendix describes a method used to calibrate the ear simulator.
  • Page 36 GMGA MEASURING Address: No. 33 Alley 99/120 Dinh Cong Ha, Dinh Cong Ward, Hoang Mai District, 10000 Hanoi City, Vietnam Telephone: +84 845 969 336 Email: info@gmga.vn Website: https://gmga.vn/...

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