Audio Precision AECM206 Manuale utente

AECM206

headphone test fixture

User’s Guide and Specifications

November, 2017

model AECM206

Printed in the United States of America.

No part of this manual may be reproduced or transmitted

in any form or by any means, electronic or mechanical, in-

cluding photocopying, recording, or by any information

storage and retrieval system, without permission in writing

from the publisher.

Audio Precision, AP, and APx are trademarks of Audio

Precision, Inc. Windows™ is a trademark of Microsoft Cor-

poration. Dolby and the double-D symbol are trademarks

of Dolby Laboratories, Inc. DTS is a trademark of DTS, Inc.

pn 8211.0354 rev 000 XVII1114095536

Audio Precision

5750 SW Arctic Drive

Beaverton, Oregon 97005

503-627-0832

800-231-7350

ap.com

Documentation and Support

This booklet contains a user’s guide and full specifications for the Audio Precision

AECM206 Headphone Test Fixture. The AECM206 is an acoustic accessory that requires

ICP® powering for its internal microphones, and typically requires an audio analyzer such as

an Audio Precision APx5 Series for signal measurement and analysis.

ap.com

Visit the Audio Precision web site at ap.com for APx support information and APx

resources. You can also contact our Technical Support staff at techsupp[email protected], or by

telephoning 503-627-0832 ext. 4, or 800-231-7350 ext. 4 (toll free in the U.S.A.).

Serial Numbers

The internal microphones and preamplifiers are mated and calibrated as a pair, and must

be maintained as a pair for the TEDS calibration to remain valid. Record your serial numbers

here for reference.

AECM206 Headphone Test Fixture sn ______________________________

Left Ear Usage (blue cable marking)

AECM304 Occluded Ear Simulator sn ______________________________

(with embedded microphone)

426M15 preamplifier sn ______________________________

Right Ear Usage (red cable marking)

AECM304 Occluded Ear Simulator sn ______________________________

(with embedded microphone)

426M15 preamplifier sn ______________________________

AECM206 Headphone Test Fixture: Table of Contents i

Table of Contents

User Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

What’s in the box?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Inspection and preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Removal from packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pinnae part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Attaching the pinnae. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Connection to analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Powering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

TEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Factory Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Local Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 1: Table of Contents

ii AECM206 Headphone Test Fixture: Table of Contents

Test Use Case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Removing the alignment ring plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Removing the preamplifier/microphone system from the head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Removing the preamplifier/microphone system for shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Separating the preamplifier from the microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Removing the head from the neck. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Reinstalling the preamplifier/microphone system and cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

AECM206 Headphone Test Fixture: User’s Guide 1

User’s Guide

Overview

The AECM206 is a well-isolated headphone test fixture that

supports standards-compliant headphone, earphone, earbud

and hearing protection (ear muff) testing.

Symmetrical, anatomical pinnae are provided in two hard-

nesses, accommodating circum-aural, supra-aural, intra-

concha, and insert earphone testing.

In the head of the fixture are two AECM304 ear simulators

(acoustic couplers with built-in measurement micro-

phones). Each AECM304 is fitted with an ear canal exten-

sion and connected to a 426M15 preamplifier and cable.

The fixture is stabilized and mounted on a steel base that

helps to isolate mechanical vibrations during testing.

The AECM206 complies with applicable portions of the

International Standards ISO 4869-3 and IEC 60318-4.

User’s Guide

2 AECM206 Headphone Test Fixture: User’s Guide

What’s in the box?

The AECM206 is delivered surrounded by protective contoured foam, shipped in either a cardboard carton or an optional hard

travel case. The fixture is fully assembled and ready for immediate use.

Figure 1. AECM206 as packaged for shipment

Cases for

AECM304

shipping

Cases for

426M15

shipping

Pinnae

Shore A-25

Pinnae

Shore OO-35

Fixture

lifting sling

Tools and

silicon

grease

Headphone

Test

Fixture

USB drive

documents

ADP105

adapter

for

CAL250

Space for

optional

CAL250

Coiled mic

cables

User’s Guide

AECM206 Headphone Test Fixture: User’s Guide 3

Inspection and preparation

Removal from the packaging

See Figure 1. The test fixture is protected for shipment by

contoured foam in a strong carton or hard travel case. The

fixture must be removed with care. For this purpose, a sling

is provided. Pull the sling upwards with one hand while eas-

ing the base of the test fixture out of the case with the other

hand.

Carefully remove the coiled audio cables from their cavity.

Be sure to carefully coil the cables, and to encircle the test

fixture with the sling when replacing it into the foam cutout.

To carry the AECM206, support both the neck and head

simultaneously.

Components

The headphone test fixture consists of a massive tubular

head, fitted on a neck, which is connected to a circular base.

The head encloses an internal cavity where the ear simula-

tor/preamplifier assemblies are mounted. The hat provides a

support for the headband provided with most headphones.

The AECM304 ear simulator is fitted with an internal mea-

surement microphone and is threaded for attachment to the

426M15 preamplifier. Each AECM304/426M15 assembly

is a mated pair, calibrated together. The components must

not be interchanged between assemblies.

At the acoustic end, each AECM304 is fitted with an ear

canal extension. The ear canal extensions project slightly

from the right and left side ends of the head. An alignment

ring plate is mounted on each end, to secure the pinnae and

aid in alignment when mounting headphones. See Figures 2

through 6.

Figure 2. Headphone Test Fixture key components

Face

Alignment

ring plate

Alignment

stud

Hat

Head

Neck

Neck cavity

(located in back)

Base

Collar

Preamplier

cables

User’s Guide

4 AECM206 Headphone Test Fixture: User’s Guide

Figure 3. AECM206-RING alignment ring plate and screws.

Two such rings are mounted on the AECM206.

Figure 4. ADP105 Adapter for CAL250.

Figure 5. 2.5 mm, 2 mm and 1.5 mm hex drivers; silicon

grease.

Figure 6. An AECM304, shown here fitted with an

ear canal extension to the left in the photograph, and mated

to an 426M15 preamplifier, shown to the right. Two such

assemblies are mounted within the AECM206 head.

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