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Ear Simulator Type 4157 replicates human ear acoustics for accurate testing, servicing and daily production verification of insert earphones and hearing aids.
Ear Simulator Type 4157
Ear Simulator Type 4157 is a precision artificial ear designed for electroacoustic measurements on insert earphones coupled to the ear through tubes, ear moulds or eartips.
By closely reproducing the acoustic characteristics and impedance of the human ear, it provides realistic and repeatable test conditions for evaluating hearing aids, communication headsets and other insert-ear devices.
Designed to comply with IEC 60318-4, American National Standards Institute (ANSI) S3.25 and International Telecommunication Union Telecommunication Standardization Sector (ITU-T) Recommendation P.57 requirements, Type 4157 delivers reliable, standards-based measurements for development, production and service applications.
Type 4157 enables accurate measurement of frequency response, sensitivity and distortion in insert earphones and hearing devices.
The simulator contains a carefully engineered system of internal volumes and acoustic passages that replicate the acoustic behaviour of the human ear canal.
A built-in ½-inch microphone captures the generated sound pressure at a defined reference plane, ensuring highly repeatable measurements between test setups and devices.
This realistic acoustic loading allows manufacturers and test laboratories to evaluate product performance under conditions that closely match actual use.
Ear Simulator Type 4157 is supplied as a complete measurement solution with a built-in ½-inch microphone, Type 2669 microphone preamplifier, individual calibration chart and a wide range of adapters.
The included accessories support testing of button-type insert earphones, behind-the-ear hearing aids, in-the-ear hearing aids, completely-in-the-canal devices and custom ear moulds.
Additional compatibility with pistonphones and sound level calibrators simplifies calibration workflows, while the standardized reference plane ensures consistent integration into laboratory, production and service measurement systems.
Artificial Ear: a standardized acoustic device that reproduces the acoustic properties of the human ear, enabling repeatable and comparable measurements of earphones and hearing devices.
Acoustic Impedance: the opposition an acoustic system presents to sound transmission. Replicating human-ear impedance helps ensure realistic electroacoustic measurements.
Insert Earphone: an earphone that delivers sound through an ear insert, tube, ear mould or eartip positioned within or close to the ear canal.
Reference Plane: a precisely defined measurement location within the ear simulator used to ensure consistent positioning and reproducible results between measurements.
Preamplifier: an electronic device that conditions and amplifies the microphone signal before it is processed by measurement instrumentation.
ITU-T Recommendation P.57: an international standard defining artificial ears and related devices used for electroacoustic measurements on communication products and hearing devices.
| Product Data - Ear Simulator Type 4157 (bp0262) | Data Sheets | English |
| Ear Simulator Type 4157 | Manual/Operating manual | English |
List of accessories available for all variants of this family
| Product Code | Description |
|---|---|
-4228---
|
Pistonphone calibrator, 250Hz, 124dB,Cla |
-4231---
|
0,01d Calibrator, Class1, 94&114dB, 1kHz |
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