GRAS RA0045-S6 Prepolarized Ear Simulator Based on IEC 60318-4 (60711), High Sensitivity

Standards: IEC 60318-4 (based on), ITU-T P.57
Eff vol: 1260 mm³ @ 500 Hz
Res freq: 13.5 kHz ±1 kHz

Technology

Introduction

The RA0045-S6 Prepol Ear Simulator IEC 60318-4, High Sensitivity is a special type of ear simulator for making low level acoustic measurements on earphones coupled to the human ear by ear inserts such as tubes, ear moulds, or ear tips. It has an input impedance closely resembling that of an average human ear, and, as a result, loads a sound source in very much the same way.

It is based on the requirements of IEC 60318-4 "Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts."

The RA0045-S6 is measured and calibrated according to the ITU-T Recommendation P.57.

Design

The RA0045-S6 embodies a number of carefully designed volumes connected via well-defined and precisely tuned resistive grooves. In an equivalent electrical circuit, capacitors would represent the volumes, and inductance and resistance would represent respectively air mass and air flow within the resistive groves.

It includes a GRAS 40AD 1/2" Prepolarized Pressure Microphone, High Sensitivity. Each RA0045-S6 is individually calibrated with this specific microphone.

Typical Applications and Use

The RA0045-S6 is for measurements on earphones and hearing aids coupled to the human ear by ear inserts such as tubes, ear moulds, or ear tips.

In accordance with ITU-T Recommendation P.57, the RA0045-S6 can be used with the following GRAS pinna simulators for testing telephones:

A comprehensive range of accessories for making measurements in accordance with IEC 60318-4 are available. See the tab Ordering info.

Compatibility

The RA0045-S6 can be used with a standard CCP preamplifier, e.g. the GRAS 26CA 1/2" Preamplifier or the GRAS 26CB 1/4" Preamplifier fitted with an adapter. For the 1/4" preamplifier, use either the straight GRAS RA0003 Adapter or the right-angled GRAS RA0001 Adapter

Specifications

Theoretical dynamic range lower limit with GRAS preamplifier
dB(A)
18
Dynamic range upper limit with GRAS CCP preamplifier
dB
138
Resonance frequency
kHz
13.5
Coupler volume
mm³
0.4 ccm
Humidity range non condensing
% RH
0 to 75
ANSI standard
S3.7
IEC standard
Based on 60318-4
ITU-T recommondations
P.57 Type 2
CE/RoHS compliant/WEEE registered
Yes/Yes, Yes
Weight
g / oz
52 / 1.8
Specification Conditions

Typical frequency response

 

Ordering info

 Optional items

GRAS RA0088

In Ear Adapter

GRAS GR0433

Calibration Adapter

GRAS GR0434

Stop Washer

GRAS GR0436

Tube Adapter

GRAS GR0437

Ear-mould Simulator

GRAS GR0438

Retention Ring

GRAS GR0440

Tube Adapter

GRAS RA0056

Low-leak Pinna Simulator

GRAS RA0057

High-leak Pinna Simulator

GRAS 26CA

26CA 1/2'' CCP Standard Preamplifier with BNC Connector

GRAS 26CB

26CB 1/4" CCP Standard Preamplifier with Microdot Connector

GRAS RA0001

Right-angled Adapter for 1/2" microphone and 1/4" preamplifier

GRAS RA0003

Adapter for 1/2" microphone and 1/4" preamplifier

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