EZLD is an automated software data acquisition application for the testing of Level Dependent and Active Noise hearing protection systems and headsets in accordance with industry standards*. EZLD generates test signals at a series of user established sound levels and then automates our Trident multi-function acoustic analyzer and National Instruments signal generation/data acquisition hardware to acquire the protected sound levels under the hearing protector. The software and system can be used with human subjects for MIRE testing or as a fixture based testing solution. Test results are displayed graphically within the EZLD application and can be exported into Microsoft Excel templates for post process data analysis.
BS EN352 Hearing protectors. Safety requirements and testing
ISO/TR 4869-4:1998 Acoustics — Hearing protectors — Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs
ISO 4869-6:2019 Acoustics — Hearing protectors — Part 6: Determination of sound attenuation of active noise reduction earmuffs
Methods For The Measurement Of Insertion Loss Of Hearing Protection Devices In Continuous Or Impulsive Noise Using Microphone-In-Real-Ear Or Acoustic Test Fixture Procedures