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Instructions for the use of
®
E-A-RTONE 3A
Insert Earphones
Revised 1997 per ANSI S3.6-1996 and ISO 389-2:1994
12/99
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INTRODUCTION ® Congratulations on the purchase of your new E-A-RTONE 3A Insert Earphones. Whether you are performing hearing screening in an educational or industrial setting, testing related to the fitting or evaluation of amplification, audiological research, or ® comprehensive diagnostic assessment, E-A-RTONE 3A Insert Earphones provide many advantages that can enhance test reliability and minimize or eliminate problems frequently encountered with supra-aural headphones. ® Because
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® 1. Preliminary Procedures for Use of the E-A-RTONE 3A ® Initially examine the ear canal for obstruction(s) and evaluate the proper size E-A-RLINK disposable foam eartip needed to fit the ® particular ear canal. Although the standard E-A-RLINK 3A fits most ear canals, for smaller ear canals, the smaller diameter ® E-A-RLINK 3B eartips are available. It is important to obtain a good seal and achieve the proper insertion depth. Insertion ® ® procedures are the same for the E-A-RL
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Hz 125 250 500 1000 2000 4000 8000 -10 0 dB 10 20 30 40 50 60 70 80 90 100 110 Obtained Interaural Attenuation Full E-A-RLINK insertion in both ears Shallow insertion in dead ear only Shallow insertion in both ears 2. Background Noise Reduction ® ® A major benefit of the E-A-RTONE Insert Earphone in combination with the E-A-RLINK disposable foam eartips is the reduction of background noise that might interact with the presented pure tones and influence the threshold determinations. When hea
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® 3. Positioning of the E-A-RTONE ® When positioning the E-A-RTONE unit on the subject, avoid sound tube contact with the subject’s clothing. Always use E-A- ® ® RLINK tips in both ears, or block the opposite ear with an E-A-R foam earplug. 4. Cord Assembly and Unit Placement The cord assembly is zip-cord constructed. If more distance is needed between transducer cases carefully cut the insulation bridge between the two cords and separate them to the desired distance. The proper l
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ANSI S3.6-1996 and ISO 389-2:1994 Calibration Values Frequency in Hz Coupler 2cc DB-0138 Coupler IEC 711 Coupler 2cc HA-1 125 96.0 98.0 96.5 250 84.0 87.5 84.5 500 75.5 79.5 76.0 750 72.0 76.0 72.0 1000 70.0 75.5 70.0 1500 72.0 79.5 70.0 2000 73.0 81.5 72.5 3000 73.5 83.0 72.5 4000 75.5 85.0 70.0 6000 72.0 86.0 67.5 8000 70.0 85.5 66.5 8. Correction Factors Providers who need to switch between insert and supra-aural earphones may do so with properly calibrated equipment.
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® 10. Technical Specifications and Limits for E-A-RTONE 3A Impedance: 10 Ohm, 50 Ohm or 300 Ohm 1 kHz Sensitivity: 102.5 dB SPL in DB-0138 (HA-2) coupler @ 0.1 Volt rms. (10 V) @ 0.2 Volt rms. (50 V) 103.5 dB SPL in DB-0138 (HA-2) coupler @ 0.49 Volt rms. (300 V) Limits: ± 3 dB Distortion: < 3% measured @ 500 Hz, 118.5 dB SPL Maximum output: Meets or exceeds 110 dBHL at standard audiometric frequencies between 500 and 4000 Hz Safe opera
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12. Limited Warranty ® Aearo Company warrants each insert earphone (sold under the name E-A-RTONE 3A) it manufactures to be free from defects in material and workmanship under normal use for a period of twelve (12) months from the date of sale to the original purchaser. During this warranty period Aearo Company Auditory Systems will repair or replace, at Auditory Systems sole option, free of charge, any defective part returned with shipping charges prepaid to the Distribution Center
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Aearo Company Auditory Systems Production 8001 Woodland Drive Indianapolis, IN 46278 Customer Service (from the US only): 800/624-5955 Fax: 877/807-7113 International Customer Service Ph: 317/656-5713 Fax: 317/656-5760 Technical Support Ph: 317/692-6550 Fax: 317/692-6604 ©1995, 1990, Aearo Company Auditory Systems ® ® ® E-A-R , E-A-RTONE and E-A-RLINK are all trademarks of Aearo Company 8
