This document serves as the instruction manual for the GRAS 45CA Headphone/Hearing-protector Test Fixture. It details the various configurations available, from 45CA-1 to 45CA-10, each designed for specific acoustic measurement applications.
Key Features and Applications
The GRAS 45CA is engineered for testing hearing protection devices, such as ear muffs and earplugs, as well as sound sources like headphones and earphones. Its robust design ensures minimal noise floor interference during testing.
- Configurations: Supports testing according to ISO 4869-3, IEC 60318-1, and IEC 60318-4 standards.
- Measurement Capabilities: Suitable for measuring insertion loss of hearing protection and sound quality of headphones and earphones.
- High Resolution Testing: Includes configurations for testing up to 20 kHz.
Included Configurations
The manual outlines ten distinct configurations:
- 45CA-1 & 45CA-2: For testing hearing protectors according to ISO 4869-3.
- 45CA-3 & 45CA-4: For testing headphones using IEC 60318-1 ear simulators.
- 45CA-5 to 45CA-8: For testing with pinna simulators and IEC 60318-4 ear simulators, including anthropometric pinnae.
- 45CA-9 & 45CA-10: For high-resolution testing up to 20 kHz.
Technical Information
Detailed technical specifications, calibration procedures, and mounting instructions for various components like pinnae and ear simulators are provided. The document also covers warranty, service, and repair information.
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