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:
- GRAS RA0056 Low-leak Pinna Simulator.
- GRAS RA0057 High-leak Pinna Simulator.
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
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 RA0525 | Foam insert for 60318-4 coupler, 10 pcs |
| GRAS RA0003 |
Adapter for 1/2" microphone and 1/4" preamplifier |
