PCS Piezotronics Larson Davis AEC206 Bedienungsanleitung

AEC206

Binaural Test Fixture

Larson Davis

AEC206 Binaural

Test Fixture

Reference Manual

AEC206 Reference Manual i-2

whole or in part for any use without prior written consent of PCB Piezotronics, Inc.

Disclaimer

The following paragraph does not apply in any state or country where such statements are not agreeable with local law:

Even though PCB Piezotronics, Inc. has reviewed its documentation, PCB Piezotronics Inc. makes no warranty or representation,

either expressed or implied, with respect to this instrument and documentation, its quality, performance, merchantability, or fit-

ness for a particular purpose. This documentation is subject to change without notice, and should not be construed as a commit-

ment or representation by PCB Piezotronics, Inc.

This publication may contain inaccuracies or typographical errors. PCB Piezotronics, Inc. will periodically update the material for

inclusion in new editions. Changes and improvements to the information described in this manual may be made at any time.

Record of Serial Number and Purchase Date

AEC206 Serial Number: ___________

426M11 Serial Number: ___________ Serial Number: ___________

AEC304 Serial Number: ___________ Serial Number: ___________

Recycling

PCB Piezotronics, Inc. is an environmentally friendly organization and encourages our customers to be environmentally conscious.

When this product reaches its end of life, please recycle the product through a local recycling center or return the product to:

PCB Piezotronics, Inc.

Attn: Recycling Coordinator

1681 West 820 North

Provo, Utah, USA 84601-1341

where it will be accepted for disposal

Warranty

For warranty information, refer to our Terms and Conditions of Sale on our website, www.larsondavis.com/TermsConditions.aspx.

i.1 Contact Larson Davis

Website

www.larsondavis.com

Worldwide Corporate Headquarters

Larson Davis - a PCB Piezotronics division

3425 Walden Avenue

Depew, NY 14043-2495 USA

Toll-free (in the US): 888-258-3222

Phone: 716-926-8243

USA fax: 716-926-8215

E-mail: [email protected]om

AEC206 Reference Manual ii-1

Table of Contents

Module 1 Getting Started 1-1

1.1 Overview ...............................................................................................................................................................1-1

1.2 Components ........................................................................................................................................................1-2

1.3 Connecting to Analyzer .....................................................................................................................................1-4

1.4 Performing Calibration ......................................................................................................................................1-6

Module 2 Assembly 2-1

2.1 Overview ...............................................................................................................................................................2-1

2.2 Mounting Artificial Pinnae .................................................................................................................................2-2

2.3 Ear Simulator and Preamplifier .......................................................................................................................2-3

2.4 Storage ............................................................................................................................................................... 2-12

Appendix A Technical Specifications A-1

A.1 AEC206 ................................................................................................................................................................. A-1

A.2 426M11 Microphone Preamplifier .................................................................................................................. A-2

A.3 Isolation Testing ................................................................................................................................................ A-2

A.4 Transfer Functions ............................................................................................................................................. A-3

A.5 Declaration of Conformity ............................................................................................................................... A-9

AEC206 Reference Manual Overview 1-1

Module 1Getting Started

1.1 Overview ................................................................................................................................................ 1-1

1.2 Components ......................................................................................................................................... 1-2

1.2.1 Optional Accessories .......................................................................................................... 1-3

1.3 Connecting to Analyzer ....................................................................................................................... 1-4

1.4 Performing Calibration ....................................................................................................................... 1-6

1.1 Overview

The AEC206 is a binaural test fixture used for testing headphones and

earbuds, both supra-aural and circum-aural as well as hearing protection

devices.

In the head of the fixture are two 426M11 preamplifiers with AEC304

occluded ear simulators. It is stabilized and mounted on a steel circular

base. Included are two sets of pinnae with two hardness grades.

AEC206 complies with applicable portions of the International Standards

ISO 4869-3 and IEC 60318-4.

FIGURE 1-1 AEC206 Anatomy

Neck Cavity

(located in back)

Base

Alignment

Screw

Head

Neck

Face

Hat

Alignment

Ring

Preamplifier

Cables

AEC206 Reference Manual Components 1-2

1.2 Components

The test fixture needs to be removed with care. For this purpose, a sling is

provided. With one hand pull the sling upwards, and ease the base of the

test fixture out of the case with your other hand. To carry the AEC206, hold

both the neck and head simultaneously.

FIGURE 1-2 AEC206 Components

LEFT

AEC304 IEC

60318-4

Occluded Ear

Simulator

RIGHT

AEC304 IEC

60318-4

Occluded Ear

Simulator

AEC206-RING

Alignment Ring

with screws

SAE206.01 AEC206

Binaural Test

Fixture with nylon

sling

ADP105 adapter

for a CAL250

calibrator

Pinnae

AEC-L0035 Left

Pinna Shore OO-35

AEC-R0035 Right

Pinna Shore OO-35

AEC-LA25 Left Pinna

Shore A-25

AEC-RA25 Right

Pinna Shore A-25

LEFT 426M11 short 1/2” Preamplifiers with

integrated cable & BNC connector

TAKE NOTE Each AEC304 and 426M11 are a mated pair. They cannot be

interchanged, see 2.3.1 "Mated Pair" on page 2-3.

RIGHT 426M11 short 1/2” Preamplifiers

with integrated cable & BNC connector

CCS050 hard case

with custom foam

AEC206 Reference Manual Components 1-3

FIGURE 1-3 Tools

1.2.1 Optional Accessories

CAL250

Battery operated precision microphone calibrator used for the calibration

of the AEC304 and other Larson Davis sound measurement equipment. It

has a full 114.0 dB level output signal at 251.2 Hz.

AEC206-CUP

Isolation test copper cup with foam insert used for isolation testing to

confirm compliance with ISO 4869-3. Requires two cups.

Silicon Grease 2.5 mm Hex Driver

For neck, vent, and

set screws

2 mm Hex Driver

For alignment

ring screws

1.5 mm Hex Driver

For alignment screw

AEC206 Reference Manual Connecting to Analyzer 1-4

1.3 Connecting to Analyzer

A basic headphone test can be made with the following mechanical

setup:

FIGURE 1-4 Basic Headphone Configuration

AEC206 Reference Manual Connecting to Analyzer 1-5

FIGURE 1-5 Headphone Test with Impedance/T-S

AEC206 Reference Manual Performing Calibration 1-6

1.4 Performing Calibration

There are several ways the system is calibrated:

TEDS

The AEC304 is equipped with TEDS sensors. TEDS (Transducer Electronic

Data Sheet) sensors allow TEDS enabled analyzers to automatically read

sensitivity data from the sensor.

Factory Calibration

Periodically the AEC206 is shipped to Larson Davis for factory calibration.

An alternative method for factory calibration is to remove the AEC304 and

paired 426M11 and ship to Larson Davis, then reassemble when returned.

This alternate method calibrates the AEC304 and 426M11 only, it does not

verify that the unit complies with isolation test as described in ISO 4869-3.

For information on removal, see 2.3.2 "Removing Ear Simulator and

Preamplifier" on page 2-4.

Acoustic Calibration

A technician performs a manual acoustic calibration at the beginning and

end of the day (or test) to ensure the test was performed accurately.

The following procedures describe an acoustic calibration:

Step 1 Ensure the ADP105 adaptor is securely on the CAL250.

TAKE NOTE Unless you use the

CAL250 on another device,

there is no need to remove the

adapter between use.

Step 2 If pinna and ring are installed, remove prior to calibration.

See “Removing Artificial Pinna” on page 2-3.

Step 3 Place calibrator over the microphone. Gently secure the

gasket-tight connection with a push.

FIGURE 1-6 Calibration Setup

Step 4 Turn calibrator on by pressing the button.

TAKE NOTE The CAL250 will run

for 60 seconds after you turn it

on.

Step 5 Run the calibration process on the connected analyzer.

Step 6 When the calibration is complete, position your hand on the

bottom half of the calibrator, and then bend it up or down

about ten degrees, then pull outward. Do not pull outward

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