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ER-3A is a registered trademark of Etymotic Research, Inc.  

Tubephone and ER-3C are trademarks of Etymotic Research, Inc.

Single-Use-Eartips is a trademark of Grason Associaties, Inc. 

Telephonics is a registrated trademark of Telephonics Corporation
Patent Pending.
©2016 Etymotic Research, Inc.    

ER003442-C

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 

the product in kind without charge to the original purchaser, repairing 

the part, or crediting the original purchaser with the purchase price of 

the returned defective part. For a part to be covered by the warranty 

it must be returned to Etymotic Research, postage prepaid, within 

the warranty period, and the part must not show evidence of misuse, 

neglect, incorrect wiring by others, or improper installation.

DISPOSAL

Within the European Union it is illegal to dispose of electrical and 

electronic waste as unsorted municipal waste. Electrical and electronic 

waste may contain hazardous substances and therefore have to be 

disposed of separately. Such products will be marked with the crossed-

out wheelie-bin image shown below. User cooperation is important 

in order to ensure a high level of reuse and recycling of electrical 

and electronic waste. Failure to recycle such waste products in an 

appropriate way may endanger the environment and consequently the 

health of human beings. Outside the European Union, local regulations 

should be followed when disposing of the product after its useful life.

Manufacturer

Etymotic Research, Inc.
61 Martin Lane
Elk Grove Village, IL 60007 USA 
Phone: 847-228-0006
Toll free (U.S.): 888-389-6684
Facsimile: 847-228-6836
Technical support: 
customer-service@etymotic.com
www.etymotic.com

User Guide

TM

INSERT EARPHONES

EU Authorized Representative

Medical Device Safety Service (MDSS) GmbH
Schiffgraben 41
D-30175 Hannover
Germany

Summary of Contents for ER 3C

Page 1: ...User Guide TM INSERT EARPHONES mbH ...

Page 2: ...udiometric frequencies and approximate those of Telephonics TDH 39 49 and 50 supra aural earphones Advantages of ER 3C earphones Incorporates touch proof electrical connection for safety Duplicates ER 3A smooth frequency response 30 dB external noise exclusion equivalent to a single wall booth when used with deeply sealed foam eartips 70 dB isolation interaural attenuation between ears reduces the...

Page 3: ...earch or its authorized distributors may result in inaccurate results Modification or alteration of any parts may invalidate test results Example The sound delivery tube should not be cut A change of 10 mm in the length of the sound delivery tube will change the frequency response by 0 5 dB at some frequencies Do not use in or near strong magnetic fields e g MRI Do not reuse eartips All eartips re...

Page 4: ...ncies Replace the sound delivery tubes ER3 21 if they crack or harden When using single use eartip adapters calibration will be maintained if the eartip is seated on the adapter so that the opening of the eartip is flush with the tip of the adapter 26 mm Sound delivery tube adapter Sound delivery tube Foam eartip Black tubing 2 To obtain the noise exclusion and interaural attenuation shown on page...

Page 5: ... diameter before insertion If unsuccessful use a different size eartip If the seal is inadequate try another eartip 10 Discard eartips after each person use 6 To facilitate proper placement firmly roll the foam eartip into the smallest diameter possible Insert black tubing onto the sound delivery tube adapter Sound delivery tube adapter Sound delivery tube Foam eartip Black tubing 5 INSTRUCTIONS F...

Page 6: ...le wall booth Testing to audiometric zero can be done reliably whenever the SPL of the background noise is less than 45 dBA The graph below shows the attenuation of two audiometric earphones ER 3 Series insert earphones have significantly greater attenuation than traditional supra aural earphones and circumaural earphones 6 EXTERNAL NOISE EXCLUSION OF 2 EARPHONES Real ear Attenuation in dB Frequen...

Page 7: ...sking occurs when a high level of masking in the non test ear reaches the opposite test ear cochlea via bone conduction and elevates threshold in the test ear Interaural attenuation is significantly higher with insert earphones making it possible to use lower masking levels in the non test ear Interaural attenuation of ER 3 Series earphones increases with insertion depth The graph below illustrate...

Page 8: ...r converted each of Botsford s five noise spectra to octave band levels and adjusted each curve graphically to the highest level that would not exceed at any frequency The S3 1 1977 allowable levels Surprisingly enough for the ears open condition the corresponding A weighted level for all five of those adjusted noises fell within a 2 5 dB range 14 dBA to 16 5 dBA The authors concluded that Subtrac...

Page 9: ...specified by the audiometric equipment manufacturer in compliance with national and international standards and regulations Correction factors can be applied where it is necessary to alternate between insert earphones and a supra aural earphone with audiometers that do not provide a dual calibration option RELIABILITY Traditional supra aural earphones have limitations Among them are 1 Poor noise e...

Page 10: ...eartips ACCESSORIES AND REPLACEMENT PARTS Accessories and replacement parts are available from Etymotic Research and its authorized distributors ER3C 84 7 Cable with Dual Mono 6 33 mm 1 4 plugs ER3 21 Sound Delivery Tube Replacements with Adapters 10 ER3 04 Sound Delivery Tube Adapters ER3 05 Hook and Loop Clips ER10D T05 5 mm Single Use Eartips ER10D T03 3 mm ER10D T04 4 mm ER10D T06 6 mm ER10D T...

Page 11: ...for Audiometers 4 Botsford JH 1973 How to estimate dBA reduction of ear protectors Sound Vib 7 1 32 33 5 International Electrotechnical Commission IEC 60601 1 2005 Medical Electrical Equipment Part 1 General Requirements for Safety and Essential Performance 6 International Electrotechnical Commission IEC 60645 1 2012 Electroacoustics Audiometric Equipment Part 1 Equipment for Pure Tone Audiometry ...

Page 12: ...st not show evidence of misuse neglect incorrect wiring by others or improper installation DISPOSAL Within the European Union it is illegal to dispose of electrical and electronic waste as unsorted municipal waste Electrical and electronic waste may contain hazardous substances and therefore have to be disposed of separately Such products will be marked with the crossed out wheelie bin image shown...

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