Etymotic Research ER 3C User Manual
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Etymotic Research ER 3C User Manual

Insert earphones
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INSERT EARPHONES

User Guide

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Summary of Contents for Etymotic Research ER 3C

  • Page 1: User Guide

    INSERT EARPHONES User Guide...

  • Page 2: Introduction And Intended Use

    INTRODUCTION AND INTENDED USE ER-3C earphones are the next generation of insert earphones by ™ Etymotic Research, designed to replace Etymotic’s ER-3A Tubephone ® earphones, which have been the worldwide standard for audiometric insert earphones since 1985. ER-3 Series earphones are intended for use with audiometric equipment used in hearing testing in audiology clinics, auditory research and screening in industrial and educational settings.
  • Page 3 Labels on the earphones identify the earphone impedance. • Use of accessories or replacement parts other than those supplied by Etymotic Research or its authorized distributors may result in inaccurate results. • Modification or alteration of any parts may invalidate test results.
  • Page 4 EARTIP COUPLING Foam eartips developed for ER-3C Series insert earphones have dimensions that ensure proper calibration and test accuracy. 1. The length of black tubing from the end of the sound tube adapter through the foam eartip is 26 mm. Do not cut the black tubing that connects the foam eartip to the sound tube.

  • Page 5: Instructions For Use

    INSTRUCTIONS FOR USE 1. Refer to the audiometer manual for instructions on properly connecting the earphones. 2. Examine the ear canal for obstruction or excessive cerumen. 3. Visually determine for each ear canal if a different size eartip other than the standard foam eartip is required. 4.
  • Page 6 EXTERNAL NOISE EXCLUSION ER-3 Series insert earphones provide greater than 30-dB exclusion of background noise. As insertion depth increases, the amount of attenuation increases. Deeply-inserted ER3 foam eartips can provide noise exclusion equivalent to a single-wall booth. Testing to audiometric zero can be done reliably whenever the SPL of the background noise is less than 45 dBA.
  • Page 7 INTERAURAL ATTENUATION OF TDH AND ER-3 SERIES EARPHONES INTERAURAL ATTENUATION AND MASKING A comparison of the interaural attenuation of a TDH-39 and ER-3 Series insert earphone is shown in the above graph. High interaural attenuation values reduce the need for masking air conduction thresholds when using insert earphones.
  • Page 8 Allowable A-weighted Room Noise During Audiometric Testing The current ANSI Standard “Maximum Permissible Ambient Noise Levels (MPANLs) For Audiometric Test Rooms” [ANSI S3.1-1999 (R2013)] includes octave band and one-third octave band permissible noise levels for both supra-aural and ER-3 Series insert earphones. See the ER-3 Series Calibration Manual for more information.
  • Page 9 CALIBRATION • Before calibration, confirm that the impedance of the earphones matches the requirements of the audiometric equipment. The labels on the earphones identify the impedance. Unless the audiometer was purchased with ER-3 Series earphones precalibrated by the audiometric equipment manufacturer, the Reference Equivalent Threshold Sound Pressure Levels (RETSPL) values and procedure cited in the current version of the ANSI S3.6 or IEC 60645-1 Standard must be used to calibrate the equipment...

  • Page 10: Care And Cleaning

    • Do not use alcohol or other strong chemicals or solvents to clean earphones or any parts, including cables, sound delivery tubes and eartips. ACCESSORIES AND REPLACEMENT PARTS Accessories and replacement parts are available from Etymotic Research and its authorized distributors. ER3C-84 ER3-21 7' Cable with Sound Delivery Tube...

  • Page 11: Specifications

    CABLE ATTACHMENT AND REPLACEMENT Firmly insert the cable connector in the corresponding transducer housing socket until fully seated. Replacement cables are available through Etymotic Research and its authorized representatives. Re-calibration of audiometric equipment is not required with cable replacement. SPECIFICATIONS...

  • Page 12: Warranty

    Etymotic Research, Inc. warrants each insert earphone it manufactures to be free of defects in material and workmanship for a period of one year from the date of sale to the original purchaser. Etymotic Research’s obligation under this warranty is fulfilled, at ERI’s option, by replacing...

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