Maico ERO SCAN Operating Instructions Manual

MAICO Diagnostic GmbH

MAICO Diagnostic GmbH, Salzufer 13/14, D 10587 BERLIN, Tel. ++49 30/70714650, Fax ++49 30/70714699

Operating Instructions

MAICO EROySCAN™ SCREENER

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Table of Contents

1 Introduction ............................................................................................. 1



2 Important Safety Instructions .................................................................... 2

3 Purpose .................................................................................................... 5

4 Description ............................................................................................... 7

5 Setup ....................................................................................................... 9

5.1. Unpacking the System ....................................................................... 9

5.2. Connection to the optional Printer .................................................. 10

5.3. Environmental conditions ................................................................ 11

5.4 Battery Installation ........................................................................... 11

5.5 Loading Paper into the optional Printer ............................................ 12

5.6 Attaching Eartips .............................................................................. 13

6 Quick Start ............................................................................................. 14

7 Performing DPOAE and TEOAE Tests ...................................................... 15

7.1. Preparing the Patient for Testing ..................................................... 15

7.2. Control Buttons .............................................................................. 15

7.3. Turning on the Instrument .............................................................. 15

7.4. Testing in the Default Modes .......................................................... 16

7.4.1 To Begin Testing ......................................................................... 17

7.4.2. Testing children with PE Tubes .................................................. 18

7.4.3 Auto Calibration ......................................................................... 18

7.4.4 Reviewing Results ....................................................................... 19

7.4.5 Test Technique ........................................................................... 19

7.5 Remote Probe (optional) ................................................................... 20

7.5.1 Installing the Remote Probe ........................................................ 20

7.5.2 Testing with the Remote Probe ................................................... 22

7.6 Noise Sources ................................................................................... 22

7.7 Printing the Results (optional) ........................................................... 23

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7.8 Setting the Clock ............................................................................. 24

8 Changing Instrument Settings ................................................................ 26

9 Interpreting Results ................................................................................. 30

10 Cleaning and Maintenance ................................................................... 34

10.1 Probe Tip Replacement ................................................................... 34

11 Troubleshooting ................................................................................... 36

12 Replacement Parts ................................................................................ 37

13 Technical Data ...................................................................................... 38

14 Warranty, Maintenance and Service ...................................................... 40

15 Safety Regulations ................................................................................ 41

16 Certificate of Conformity ...................................................................... 42

Appendix A Internal Probe Specifications ................................................... 44

Appendix A Remote Probe Specifications ................................................... 45

Appendix B Program Flowchart .................................................................. 46

Appendix B Program Flowchart .................................................................. 47

Appendix C Test Sequence ........................................................................ 48

Appendix D Pass/Refer Criteria for DPOAE ................................................. 49

Appendix D Pass/Refer Criteria for TEOAE .................................................. 51

Appendix E Preset Test Protocols ............................................................... 53

Appendix F Testing at 4 kHz ...................................................................... 54

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1 Introduction

Thank you very much for purchasing a quality product from the MAICO family.

This automatic OAE-test system MAICO ERO•SCAN™ Screener is

manufactured to meet all quality and safety requirements, and has been

certified with the CE-symbol according to Medical Directive 93/42/EEC.

In designing the MAICO ERO•SCAN™ Screener we placed particular

importance in making it a user-friendly device, meaning its operation is simple

and easy to understand. And because all functions are software controlled,

upgrading later to new, extended measurement functions will be simple and

inexpensive. That means that you have invested in a device that will adjust to

your future needs.

This user manual should make it as easy as possible for you to become familiar

with the functions of the MAICO ERO•SCAN™ Screener. Please open out the

flap of illustrations on the last page. The description of the position (e.g.) of

controls, displays and connections, found again in the text, will make it easier

for you to learn how to operate the MAICO ERO•SCAN™ Screener.

If you have problems or have ideas for further improvements, please get in

touch with us. Simply call.

Your MAICO-Team

This manual applies to firmware version 7.67 and higher.

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2 Important Safety Instructions

The MAICO ERO•SCAN™ Screener Otoacoustic Emission Test System should

be used only by those individuals trained to perform the testing for which it

has been designed. No person should attempt to use this instrument without

the necessary knowledge and training to understand how this equipment is to

be properly utilized and interpreted.

Precautions

READ THIS ENTIRE MANUAL BEFORE ATTEMPTING TO USE THIS SYSTEM.

Use this device only as described in this manual.

Use only the disposable eartips designed for use with this instrument.

Never insert the probe tip into the ear canal without affixing an eartip.

The eartips are disposable and for single patient use only. Do not clean or

reuse eartips.

Use only disposable 1.5v AA/UM-3/R6 Alkaline batteries for the test

instrument. Do not use rechargeable cells in this device; do not mix battery

types and do not mix old and new batteries.

Remove the batteries from the instrument if it will not be used for 4 weeks or

more.

Do not immerse the unit in any fluids. See the Cleaning section of this manual

for proper cleaning procedures.

Do not drop or otherwise cause undue impact to this device. If the instrument

is dropped or otherwise damaged, return it to the manufacturer for repair

and/or calibration. Do not use the instrument if any damage is suspected.

Use and store the instrument indoors only. Do not use this instrument or its

accessories in temperatures below 40°F (4°C) or above 100°F (38°C), or in

relative humidity of more than 90%.

Do not attempt to open or service the instrument. Return the instrument to

the manufacturer for all service. Opening the instrument case will void the

warranty.

Do not operate the printer if the power supply has a damaged cord or plug.

See the instructions on the following page.

Do not expose the printed results to sunlight or heat. Printing on thermal

paper fades with exposure to light or heat.

Photocopies of test results should be made if the records are to be kept

indefinitely.

The ERO•SCAN™ Screener Instrument probe tip must not be

inserted into an ear at any time without a disposable eartip

properly affixed.

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Disclaimer

The MAICO ERO•SCAN™ Screener Test Instrument is designed to be a

screening device for hearing loss. Sensitivity and specificity of this type of

device are based on the test characteristics defined by the user, and may vary

depending on environmental and operating conditions. The presence of

otoacoustic emissions suggests normal outer hair cell function, which in turn

correlates to normal hearing. However, a passing result using this instrument is

not an indication that the full auditory system is normal. Thus, a PASS result

should not be allowed to override other indications that hearing is not normal.

A full audiologic evaluation should be administered if concerns about hearing

sensitivity persist. A REFER test result should not be assumed to be an indicator

of a lack of auditory function; however, it should be followed with full

audiologic diagnostic testing.

NOTICE: Under certain circumstances, especially in low-humidity environments,

common electrostatic discharge may cause this instrument to turn itself off.

This effect causes no permanent damage, and the instrument may be turned

on again by the normal procedure of holding the DOWN button.

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READ THIS SECTION CAREFULLY BEFORE USE

Printer AC Power Source Precautions

The printer AC power source converts main voltage (120V AC or 230V AC) to

a low voltage (12V DC) for powering the printer. Use only the power source

supplied for this purpose.

This product is for indoor use only. Do not expose to water or excessive dust.

This product is not suitable for operation in the presence of flammable

anesthetic mixture with air or with nitrous oxide.

Do not cover the power source body as it may result in excessive heating. The

power source operates when the plug is inserted into an outlet. To turn it off,

remove the plug from the outlet. The outlet must be easily accessible and

located near the printer. Should a faulty condition occur, remove the plug

from the outlet immediately.

High Voltage Inside! Do not remove the power supply cover! All service or

maintenance must be done by trained personnel. Return the power supply to

the manufacturer for service.

Cleaning and Disinfecting the Unit

Wipe the surface with a cloth slightly dampened with mild detergent or

normal hospital bactericides. Do not immerse the unit. Do not clean the unit

with isopropyl alcohol or other solvents.

Optional Printer Rechargeable Battery Precautions

Do not attempt to open the battery pack. The printer battery pack contains Ni-

Mh cells. Cadmium is a potentially toxic heavy metal, and exposing the cells

increases the risk of leakage or short-circuiting.

Do not short circuit the battery contacts. This could cause burns or a fire.

Disconnect the printer power supply before removing or replacing the battery

pack.

Observe local regulations for handling, transport, and disposal of Ni-Mh cells.

Regulations in many areas prohibit the disposal of Nickel-Cadmium cells.

Complete battery packs may be returned to the manufacturer for recycling.

The battery pack must be charged for a minimum of five hours before using

the printer for the first time. Failure to fully charge the battery pack before use

may reduce the life of the battery pack.

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3 Purpose

The purpose of the ERO•SCAN™ Screener test system is to provide a rapid

measurement and documentation of Distortion Product Otoacoustic Emissions

(DPOAEs) or Transient Evoked Otoacoustic Emissions (TEOAEs) at several

frequencies.

What Are DPOAEs?

Distortion Product Otoacoustic Emissions (DPOAEs) are acoustic signals that

can be detected in the ear canal of a person with normal outer hair cell

function, subsequent to stimulation of the auditory system with a pair of pure

tones at frequencies f

1

and f

2

. The resulting emission of interest is the

distortion product tone at the frequency 2f

1

-f

2

.

What Are TEOAEs?

Transient Evoked Otoacoustic Emissions (TEOAEs) are acoustic signals that can

be detected in the ear canal of a person with normal outer hair cell function,

subsequent to stimulation of the auditory system with a series of wideband

clicks.

What Do Otoacoustic Emissions Results Tell Us?

Available evidence suggests that otoacoustic emissions (OAEs) are generated

by the cochlea’s outer hair cells, and that the presence of OAEs is an indication

that the outer hair cells are normal. Although OAE test data provide no

indication of inner hair cell function, or of hearing ability, current research

indicates that the majority of hearing-impaired individuals will be identified by

a simple OAE test. Patients who fail to generate OAEs should be rescreened

and/or referred for additional audiological testing.

How Does the ERO•SCAN SCREENER Device Measure DPOAEs?

The ERO•SCAN SCREENER instrument generates a series of test tones, directs

them into the ear canal, and then measures the level of the DPOAE tone

generated by the cochlea. By using different test frequencies, the

ERO•SCAN™ Screener device provides an estimate of outer hair cell function

over a wide range of frequencies.

How Does the ERO•SCAN™ Screener Device Measure TEOAEs?

The ERO•SCAN™ Screener instrument generates a series of clicks, directs them

into the ear canal, and then analyzes the spectrum of the returning signal,

separating the noise and emission. By using bandpass filters, the ERO•SCAN™

Screener device provides an estimate of outer hair cell function over a wide

range of frequencies.

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How Does the ERO•SCAN™ Screener Device Work?

The digital signal processor in the instrument generates two pure tones (f

1

and

f

2

) for DPOAEs or a series of wideband clicks for TEOAEs through a digital-to-

analog converter. These tones or clicks are presented to the ear via speaker

tubes located in the probe. A microphone in the probe measures the sound in

the ear canal and transmits the signal to the analog-to-digital converter. The

digital signal processor then uses Fast-Fourier Transforms (FFTs) to filter the

signal into narrow frequency bands, and detects any emissions present. The

level of these emissions can be compared with the level of the noise.

The SPL and frequencies of the test tones and the averaging time used to

process the signals can be determined by the tester through adjustable settings

maintained in static memory within the ERO•SCAN™ Screener instrument.

What Frequency Range of Hearing is Estimated?

DPOAEs: Approximately 1 kHz to 12 kHz (depending on the frequency range

selected). Since the health of the hair cells in the region of the f

2

test

frequency are estimated, and a) the 2f

1

-f

2

emission frequency is at about six-

tenths of the f

2

frequency, b) emissions tend to be weak below 600 Hz or so,

and c) the ambient noise tends to be highest at low frequencies, the lowest f

2

test frequency that can be routinely measured is about 1 kHz. TEOAEs:

Roughly 500 Hz to 4 kHz. TEOAEs can be reliably recorded at lower

frequencies than DPOAEs, but cannot be measured reliably above 4 kHz.

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4 Description

What is the ERO•SCAN™ Screener?

The ERO•SCAN™ Screener Otoacoustic Emission test instrument is a hand-

held device designed to provide an objective test of outer hair cell function

through the measurement of Distortion Product Otoacoustic Emissions

(DPOAEs) or Transient Evoked Otoacoustic Emissions (TEOAEs). Versions with

either DPOAEs or TEOAEs or a combined instrument with both methodes are

available. The ERO•SCAN™ Screener consists of the hand-held unit, printer,

single-use eartips and other accessories. The ERO•SCAN™ Screener instrument

may be used as a screening tool, or in conjunction with conventional tests as

part of a full audiological evaluation.

The ERO•SCAN™ Screener instrument contains the hardware and software for

generating the test tones, measuring and displaying the DPOAEs or TEOAEs,

and storing the results until they are printed. The plastic housing contains

circuit boards that provide the signal processing and display the test results.

The instrument also contains four A/UM-3/R6 alkaline batteries to power the

device. The instrument uses a liquid-crystal display (LCD) and three light-

emitting diodes (LEDs) to provide a visual display of test data and test

conditions to the operator. The probe section of the instrument houses a

microphone and two speaker tubes which produce test stimuli and measure

the sound pressure level (SPL) present in the sealed ear canal. Interface of the

instrument to the ear canal is accomplished through disposable eartips made

of industrial elastomer, which fit onto the probe tip. The disposable eartips are

colour coded to facilitate easy selection by size. Four membrane-type push

buttons located on the keypad of the device allow the user to control testing

and printing, and to reset test protocols. Printing will commence upon

placement of the instrument into the cradle.

In the default test mode, the ERO•SCAN™ Screener instrument will store the

results from one patient (left and right ear) in its non-volatile memory for

subsequent printing. However, the ERO•SCAN™ Screener instrument can

store up to 50 test results. The results are displayed via the LCD on the front of

the device and are stored in the device’s internal memory. After testing is

completed, results can be printed using the printer and/or exported to a

computer. Test results are stored in the non-volatile memory so the operator

can delay printing until a later time if desired.

PC-Interface: A serial RS 232C interface for data transfer to a connected

computer is built in. A program for Windows is available as accessory.

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How are the Results Stored and Reported?

When the ERO•SCAN™ Screener is set in its default settings, the instrument

will store the results from one patient (left and right ear) in its non-volatile

memory for subsequent printing. However, the ERO•SCAN SCREENER

instrument can store up to 50 test results. The results are displayed via the LCD

on the front of the device and are stored in the device’s internal memory.

After testing is completed, results can be printed using the printer and/or

exported to a computer. Test results are stored in the non-volatile memory so

the operator can delay printing until a later time if desired.

Power On

Green

Button

LED

Cradle

Earti

p

Probe

LEDs

Dis

p

la

y

Ke

yp

ad

Headphone

Jack

Battery Drawer

(underneath)

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5 Setup

5.1. Unpacking the System

Your MAICO ERO•SCAN

TM

Screener is carefully inspected and packed for

shipping. However, it is a good practice to thoroughly inspect the outside of

the shipping box for signs of damage. If any damage is noted, please notify

the carrier immediately.

Carefully remove the instrument from the shipping box. Remove the plastic

bags and inspect the parts for any damage.

Notify the carrier immediately if any mechanical damage is noted. This will

assure that a proper claim is made. Save all packing material so the claim

adjuster can inspect it as well. Notify your dealer or MAICO when the adjuster

has completed the inspection.

SAVE ALL THE ORIGINAL PACKING MATERIAL AND THE SHIPPING CONTAINER

SO THE INSTRUMENT CAN BE PROPERLY PACKED IF IT NEEDS TO BE

RETURNED FOR SERVICE OR CALIBRATION.

Please check that all accessories listed below are received in good condition. If

any accessories are missing or damaged, immediately notify your dealer or

MAICO.

Standard accessories:

(1) ERO•SCAN

TM

Screener Hand-held Unit

(1) Cradle

(1) External mini probe

(1) Box of 156 Eartips (12 sizes)

(4) Probe Tips for internal probe

(4) Probe Tips for external probe

(4) AA/UM-3/R6 Alkaline Batteries

(already installed)

(1) Operating instruction manual

ERO SCAN Screener

Cradle

External mini probe

Eartips

Probe Tips

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Installation Printer cable

5.2. Connection to the optional Printer

Connect one end of the printer cable ´ into the port ¬♦ located on the

underside of the cradle as shown in Figure 1 to the right.

After firmly pushing the broad connector end into place, turn the screws on

either side to tighten it.

Insert the cable (battery option two cables into the slot ¬♥ provided on the

bottom of the cradle.

Return the cradle to right side up.

The other end of the cable ´ should be plugged firmly into the inlet at the

rear of the printer ³. The flat side on the small connector (look for the arrow)

goes to the bottom of the printer. The cover of the connector will slide back to

ease installation of the connector.

Plug the power supply cord into the power supply and into an electrical wall

outlet.

The printer indicator light ¯ (located on the front of the printer) will shine

steady green.

If you have the optional printer with rechargeable batteries plug the additional

short end µ of the cable ´ into the external printer power supply.

Plug the power supply cord into an electrical outlet.

If you use the printer only with batteries (option) the printer indicator light ¯

(located on the front of the printer) will blink green.

The recharging time for the batteries is at least 5 hours.

See the precautions for the batteries and printer power supply at chapter 2.

NOTE for the printer with Ni-Mh rechargeable battery pack:

The printer will not run from the power supply, the power supply only charges

the battery pack. The battery pack must be charged for a minimum of five

hours before using the printer for the first time. The printer will not function

without a charged battery pack attached. Failure to fully charge the battery

pack before use may reduce the life of the battery pack.

L H

I

B C

J

I B C

K

J

Installation printer cable

(Option)

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5.3. Environmental conditions

The MAICO ERO•SCAN

TM

Screener should be operated in a quiet room, so

that the examinations are not influenced by outside noises.

Electro-medical instruments, which emit strong electromagnetic fields (e.g.

microwaves - radiotherapy devices), can influence the function of the MAICO

ERO•SCAN

TM

Screener. Therefore the use of these instruments is not allowed

in close proximity to the ERO•SCAN

TM

Screener.

The test room must be at normal temperature, usually 15°C / 59°F to 35°C /

95°F, to guarantee precise measuring results. If the device has been cooled

down (e.g. during transport), please wait until it has warmed up.

5.4 Battery Installation

The ERO•SCAN

TM

Screener instrument uses 4 AA/UM-3/R6 Alkaline batteries.

Open the battery compartment by sliding the battery panel down and install

the batteries as indicated on the battery label. Once the batteries are correctly

in place, slide the panel back onto its tracks to close the battery compartment.

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Figure 3

Figure 4

Paper holder lever

Paper

5.5 Loading Paper into the optional Printer

Open the cover of the printer by pulling up and back. Orient the paper roll so

that the paper will feed from the bottom of the roll (see Figures 4 and 5). Place

the roll of paper into the printer by holding the white paper-holder lever back

against the case. Allow the lever to slide back so that it fits onto the hub on

the paper roll. The paper roll should move freely on the hub. Pull the green

paper-roller release lever forward until it snaps in place to disengage the roller.

Slide the end of the paper under the roller; it will come out from the front of

the roller. Pull the paper end through the roller until it extends about 3 inches

above the roller. Push the paper-release lever back. Push the green button on

the top of the printer to advance the paper. The printer indicator light on the

front of the printer will now flash green if the paper was properly installed.

Pressing the green button twice rapidly will print a test run.

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5.6 Attaching Eartips

The ERO•SCAN

TM

Screener instrument comes with a box of disposable eartips

that fit a variety of ear canal sizes. The probe tip must have an eartip attached

before inserting it into an ear canal. The eartip kit has 12 different size eartips

that are color-coded for easy selection. The determination of the appropriate

eartip size should be made by persons with proper training and experience.

The eartip must seal the ear canal. The best test results are obtained when the

eartip is inserted deeply into the ear canal instead of flush with the ear canal

opening. Caution must be taken, however, to ensure that the eartip does not

extend too deeply into the ear canal. Use only the eartips approved for use

with the instrument. Ordering information can be found on page 29 or inside

the eartip box. The eartips are disposable and should be replaced after each

patient. Do not attempt to clean or reuse these eartips.

After selecting an eartip, push it onto the probe tip until it is flush against the

base of the probe tip. The sound outlet tubes on the probe tip are recessed to

minimize the likelihood of clogging. If the probe tip does become plugged or

clogged, it must be replaced. See the section

Probe Tip Replacement

on for

further information. To remove the eartip, grasp the eartip at the base and

twist it while pulling it straight off the end of the probe tip.

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109 12

Figure 1

Figure 2

6 Quick Start

These steps will allow you to quickly start using the ERO•SCAN™ Screener

OAE Test System. If you have a TEOAE instrument it will be in the TEOAE test

mode. Be sure to perform the necessary otoscopic examination prior to testing.

Read the entire manual before testing patients

.

NOTE: In order to print the test results, the printer must be charged for 5

hours.

Step 1 Place an eartip as far down as possible on the probe tip.

Step 2 Turn on the ERO•SCAN instrument by pressing the large

DOWN arrow button Ì.

Step 3 Select the test ear by pressing the ◂ left Ë or ▸ right Î

arrow key.

Step 4 Insert the eartip deeply into the patient’s ear canal to obtain a seal.

When a seal is obtained, the MAICO ERO•SCAN™ Screener

instrument will automatically begin the test by first calibrating

and then testing emissions.

The red ERROR LED Ç will illuminate if there is noise in the

environment. This flashing is normal and will often occur. Once

the testing is finished, the unit will display PASS or REFER on

the LCD display.

When testing is completed on both ears, turn the optional printer on by

pressing the green button on top and place the hand-held unit on the cradle.

The most recent test results for both ears will automatically print out.

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7 Performing DPOAE and TEOAE Tests

7.1. Preparing the Patient for Testing

Otoscopic examination of the patient’s ear canals should be performed prior to

testing. Excessive cerumen or vernix in the ear canals may interfere with the

test and give invalid or incomplete results. Patients with excessive cerumen,

debris, or foreign bodies in the ear canals should be referred to an audiologist

or physician for removal of the blockage prior to testing.

Place the patient in a position that will allow the ERO•SCAN

TM

Screener

instrument to be held steady while testing is in progress. The patient should

remain still and quiet while the test is being performed.

7.2. Control Buttons

The ERO•SCAN

TM

Screener instrument uses 4 buttons to control all functions

of the instrument. These buttons are arranged in a directional cursor format.

The arrows on the keys (← LEFT, → RIGHT, ↑ UP, ↓ DOWN) correspond to the

arrows that are used on the screen. The screen will indicate which button to

push by showing the appropriate arrow.

NOTE: The UP key will always bring the instrument back to either the previous

menu or the main menu. The UP key will also turn the unit off when the

instrument is at the Main Menu.

7.3. Turning on the Instrument

To turn on the ERO•SCAN

TM

Screener instrument, press the large DOWN key

located below the instrument’s display screen. Three small lights (red, yellow

and green) will appear briefly just above the display screen. The green ready

light will remain on. Figure 6 shown below will quickly appear. This display will

indicate the type of instrument, software version, serial number, and operating

mode (DP, TE, DP custom or TE custom).

If the batteries have sufficient power, the ERO•SCAN

TM

Screener instrument

will automatically check the date and time settings. If there are no date/time

errors detected, the Main Menu (Figure 7) will appear on the display.

NOTE: If this is the first time the ERO•SCAN

TM

Screener instrument is being

used, or if you wish to change the date or time, see

Setting the Clock

for

instructions on setting the correct date and time.

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Automatic Shutdown

The ERO•SCAN

TM

Screener instrument has an automatic “shutdown” feature,

designed to prolong battery life.

The unit will automatically shut down after 1 minute (default) of inactivity. To

turn it back on, simply press the large DOWN key. This feature can be re-

programmed for various periods of inactivity before “shut-down.” (See the

Changing Instrument Settings – Auto-Shutdown Time

section for further

information on this feature.)

7.4. Testing in the Default Modes

For either DPOAEs or TEOAEs there are a default test protocol and a user

definable protocol called a “custom”setting. The default protocols will be used

unless a custom protocol is selected by the user. See

Changing Instrument

Settings - Test Mode

. Appendix E contains information on custom protocols,

and the Advanced Options for DPOAE Testing or TEOAEs allow the user to

change test protocols.

The settings for testing in the default DP protocol are as follows:

Number of Frequencies Tested = 4 Averaging Time = 4 Seconds

Frequency Range = 2 kHz to 5 kHz Pass SNR (Signal-to-Noise Ratio) = 6 dB

P1 (Intensity of F1 in dB SPL) = 65 Number of Passing Frequencies for Overall

Test Pass = 3

P2 (Intensity of F2 in dB SPL) = 55

The settings for testing in the default TE protocol are as follows:

Number of Bands Reported = 6 Averaging Time = 64 Seconds

Figure 4

Main Menu

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GebaEroscreenE_09a.doc 17 851 983/6 03/09

Operating Instructions EROxSCAN

TM

Screener

Frequency Range = 1.5 kHz to 4 kHz Pass SNR (Signal-to-Noise Ratio) = 4

dB

Click Presentation Level = 83 dB Number of Passing Frequencies for Overall

Test Pass = 3

SPL Peak Equivalent

7.4.1 To Begin Testing

To begin testing, place an eartip as far down as

possible on the probe tip, turn on the ERO•SCAN

TM

Screener instrument by pressing the down button and

select either the LEFT or RIGHT arrow key to indicate

which ear will be tested. After the test ear is selected,

Figure 8 will be shown. This display shows two horizontal bar graphs

representing the environmental noise (NOISE) and the ear canal volume

(VOLUME).

When both bars fill the screen from left to right, the

environmental noise is high and the ear canal volume

is large. As the unit is inserted into the ear canal,

both horizontal bars should decrease from right to

left indicating a decrease in environmental noise and

ear canal volume. To obtain a seal and measure

emissions, gently insert the eartip into the patient’s

ear canal. It should fit snugly and comfortably.

The best test results are obtained when an eartip is inserted deeply into the ear

canal instead of flush with the ear canal opening (See Appendix F). The NOISE

and VOLUME bar readings should be used as an indication that the unit is

sealing the ear canal. If the VOLUME and NOISE bars continue to fill the

screen, the unit is not sealing the ear canal, and appropriate adjustments

should be made until a decrease in these bars is seen.

Note that for an adult, the VOLUME bar will decrease

to about half (Figure 9), while for a newborn or child,

the VOLUME bar will decrease further to the left

(Figure 10). The NOISE bar will show a decrease from

the original reading. When a seal is obtained, the unit

will automatically begin testing (autostart) and the

yellow test LED will illuminate throughout the test.

Figure 5

Figure 6

Figure 7

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Maico ERO SCAN Operating Instructions Manual

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