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Summary of Contents for E-A-R Auditory Systems E-A-RTONE 5A
- Page 1 Auditory Systems Instructions for the use of Insert Earphones...
- Page 2 INTRODUCTION Congratulations on the purchase of your new E-A-RTONE ® 5A Insert Earphones. The E-A-RTONE ® 5A was designed to retain all the advantages of the E-A-RTONE ® 3A Insert Earphone, and provide additional features. The front tubes that conducted sound from the body level transducer of the 3A model to the ear canal, and the tubing or “plumbing”...
- Page 3 Your distributor or E-A-R Auditory Systems can help you determine which version is appropriate for your equipment. E-A-RTONE ® 5A Insert Earphones were designed to mimic the frequency response of the TDH-type earphone. It is strongly recommended, however, that the (RETSPL) values and procedure cited in the ANSI S3.6 - 1996...
- Page 4 1. Preliminary Procedures for Use of the E-A-RTONE ® Initially examine the ear canal for obstruction(s) and evaluate the proper size of E-A-RLINK ® disposable foam eartip needed to fit the particular ear canal. Although the standard E-A-RLINK ® 3A fits most adult ear canals, the smaller diameter E-A-RLINK ®...
- Page 5 Proper insertion depth is necessary to achieve maximum ambient noise attenuation and interaural attenuation. The graph below depicts interaural attenuation as a function of insertion depth. The described interaural attenuation is obtained for each ear in which the E-A-RLINK ® is fully inserted, regardless of whether it is the “sending”...
- Page 6 ANSI S3.1-1999 - Ears covered: octave band MPANLs using a supra-aural or insert earphone for three test frequency ranges re: 20µPa to nearest 0.5 dB. Supra-aural Earphone E-A-RTONE Full Insertion Octave Band 125 - 250 - 500 - 125 - 250 - 500 - Intervals...
- Page 7 thresholds for the HA-1, HA-2 (DB 0138) and Ear Simulator 2cc couplers. The Bruel & Kjaer 2cc DB-0138 (HA-2) coupler will simplify the calibration procedure and is recommended. Reference thresholds for the DB-0138, IEC 711, and HA-1 couplers are presented below. Should calibration be performed for an audiometer currently calibrated towards ISO-389, the reference thresholds in a 2cc DB-0138 coupler should be used.
- Page 8 6. Correction Factors Providers who need to switch between insert and supra-aural earphones may do so with properly calibrated equipment. Previously provided “out-of-the-box” correction factors, however, have been judged to be imprecise for clinical work, particularly when used with audiometers that have been calibrated to account for equipment changes over time.
- Page 9 7. Calibration for Speech Audiometry ANSI S3.6-1996 specifies the 1 kHz reference-tone level for the speech circuit as 12.5 dB above the 1 kHz pure-tone reference test threshold for the earphone in question. Calibration of the E-A-RTONE ® for speech is thus performed by setting a 1 kHz signal at 0 VU through the speech circuit, setting the attenuator to 60 dBHL, and adjusting for 72.5 (60.0 + 12.5) dB SPL in the 2cc coupler.
- Page 10 9. Reference Equivalent Threshold Sound Pressure Levels (RETSPLs) According to ANSI S3.6-1996 and ISO-389-2:1994 ANSI S3.6 and ISO 389-2 Reference Thresholds Sound Pressure Levels in dB re. 20 µPa Frequency in Hz Coupler 2cc DB-0138 Coupler IEC 711 Coupler 2cc HA-1 26.0 28.0 26.5...
- Page 11 the operation and other instructions found in the written materials provided with the product, or repairs other than those made by Aearo Company Auditory Systems. There are no obligations or liabilities on the part of Aearo Company Auditory Systems for consequential damages arising out of, or in the connection with, the operation, use or performance of the product including, without limitation, with respect to loss of revenues or profit.
- Page 12 E-A-R Auditory Systems 8001 Woodland Drive Indianapolis, IN 46278 Customer Service (toll free 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 2000 Aearo Company Auditory Systems E-A-R ®...