Maico MA 25 User manual

MAICO Diagnostics | 10393 West 70th Street | Eden Prairie, MN 55344, USA | Toll Free 888.941.4201
MA 25
Operating Manual

MA 25 Operating Manual
i
Table of Contents Page
1....................................................................................................................................................Introduction
.......................................................................................................................................................................................1
2..................................................................................................................................................... Description
.......................................................................................................................................................................................2
2.1. Extended Function ..........................................................................................................................................2
2.2. Important safety note .....................................................................................................................................3
2.3. Unpacking and checking the MA 25 ...............................................................................................................5
2.4. Standard accessories .......................................................................................................................................5
2.5. Optional accessories........................................................................................................................................5
2.6. Connecting the accessories .............................................................................................................................6
3...................................................................................................................... Function of buttons and display
.......................................................................................................................................................................................7
3.1. Function buttons ............................................................................................................................................8
3.2. MA 25e Special Functions ...............................................................................................................................8
3.3. Display............................................................................................................................................................9
4.................................................................................................................. Performing tone audiometric tests
.....................................................................................................................................................................................10
4.1. Auto Threshold:............................................................................................................................................11
5.................................................................................................................................................... Setup menu
.....................................................................................................................................................................................12
6................................................................................................................................. Warranty and disclaimer
.....................................................................................................................................................................................15
7.....................................................................................................................................Care and maintenance
.....................................................................................................................................................................................16
8...........................................................................................................................................Safety regulations
.....................................................................................................................................................................................17
8.1. Electrical safety: ............................................................................................................................................17
8.2. Measurement safety: ....................................................................................................................................17
8.3. Instrument handling:.....................................................................................................................................17
8.4. Operation: ....................................................................................................................................................17
9................................................................................................................................................. Technical data
.....................................................................................................................................................................................18

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1. Introduction
Thank you for selecting one of our quality products from the MAICO family range. The MA 25/MA 25e is designed
and manufactured to meet all quality and safety requirements.
Particular attention has been taken during the designing phase of the MA 25/MA 25e to ensure its user-friendliness,
meaning that its operation is simple, easy to learn and to understand. As all the functions are software-controlled,
upgrading the software and/or adding additional functions at a later date will be simple and cost-effective. By
purchasing the MAICO MA 25/MA 25e, you have made a decision towards long-term investment.
This operating manual aims to make learning and understanding the different MAICO MA 25/MA 25e functions as
quick and as easy as possible. Should you encounter any problems or have ideas for any further improvements, we
are only a phone call away. Please do not hesitate to contact us.
Your MAICO-Team

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2. Description
The MA 25/MA 25e screening audiometer is designed to be a device for screening for hearing loss. Output 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 screening for hearing loss using this kind of audiometer depends
on the interaction with the patient. As with any type of hearing screening, a “pass” result should not overrule any
additional concerns regarding hearing ability. A full audiologic evaluation should be administered if concerns about
hearing sensitivity persist.
The MA 25/MA 25e audiometer is intended to be used by an audiologist, hearing healthcare professionals, or
trained technicians in a quiet environment.
2.1. Extended Function
The MA25e extends the MA25 functionalities with the following three extra features:
• The MA25e can communicate with a computer.
• In addition to traditional manual testing, the MA25e incorporates a Hughson-Westlake patient controlled automatic
threshold test complying with ISO 8253. When the test is completed the results are easily recalled from the internal memory
of the MA25e.
• Talk Forward function that makes the MA25e easy to work with particularly in sound booth installations.

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2.2. Important safety note
The MA 25 should always be operated in a quiet room with minimal magnetic influence, to ensure that
examinations are not disturbed by external noise.
Electro-medical instruments that emit strong electromagnetic fields (e.g. microwaves, radiotherapy devices) can
affect the operation of the MA 25.
Therefore, the operation of these instruments in close proximity to the MA 25 should be avoided at all times.
The examination room should have a normal temperature between 15˚C/ 59˚F and 35˚C/ 95˚F. If the instrument has
cooled down during transportation, please wait for it to warm up to room temperature before operation.
Attention
PLEASE READ THE ENTIRE MANUAL CAREFULLY BEFORE OPERATING THIS INSTRUMENT.
Please only use this instrument as described in the manual.
Please familiarize yourself with the instrument and its operation before using.
Should defects or damages be suspected, please do not, under any circumstances, use or attempt to
fix the instrument yourself.
Calibration of the instrument: The audiometer and the headphone complement each other and share
the same serial number (i.e. 63252). Therefore, the instrument shall not be used with any other
headphone prior to recalibration. Recalibration also needs to be conducted, when a defective
headphone is replaced.
NOTE: Uncalibrated instruments may lead to faulty measurements.

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Take note to ensure that all the accessories have been properly connected.
To avoid person-to-person cross contamination of communicable diseases, parts that come in direct contact with
the patient (i.e. earphone cushions) should be disinfected using commercial disinfectant after each use.
In accordance with the Electronic Equipment Act for disposal of electronic equipment, the customer is
obliged to dispose of the used consumables, according to appropriate regulation at own cost.
2.3.

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2.3. Unpacking and checking the MA 25
Checking for packaging and content damage
Thoroughly inspect the exterior of the shipping box for any sign of damage or tampering. Should any damage be
noted, please notify the carrier immediately. If the content box has been damaged during transportation, the
instrument should be checked for any electrical or mechanical defects. Should any defects be identified, please
contact the responsible dealer. Keep all original packaging to facilitate any insurance claims against the damages.
PLEASE KEEP ALL ORIGINAL PACKAGING FOR FUTURE USE!
The MA 25 is packaged in a specially-designed box. Please keep the box as it will be useful for sending the
instrument for the annual instrument check-up.
Please contact your nearest responsible dealer should the annual instrument check-up be needed.
2.4. Standard accessories
DD 45 Audiometric Headset
Audiogram pad
Operation Manual
3 AA batteries
Carrying bag
AC power adapter

2.5. Optional accessories
Patient response switch
Audiocup headset



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Figure 1 Rear and bottom of the MA 25
2.6. Connecting the accessories
All the connection jacks can be found on the rear side of the MA 25. All the cables and accessories have to be connected
before the instrument is switched on.
Position:
Symbol:
Function:
1
Battery
Compartment for three AA batteries
2
Power / USB
Socket for external power supply
3
Patient Resp.
Socket for patient response switch
4
Right
Socket for right headphone jack
5
Left
Socket for left headphone jack

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3. Function of buttons and display
Power On and Power Off
Attention: Power on is only possible if headphones are plugged-in!
To turn on the audiometer press the Tone Switch button.
To power off the audiometer press the level dialer and frequency dialer for a few seconds. The audiometer will also
automatically power off after 3, 4, 5 minutes (or not) depending on the settings.
Pure Tone Presentation
Frequency: Turn the Frequency Hz dialer to select another frequency
Level: Rotate the Hearing Level dB dialer to increase or decrease the level
Present tone: Touch the Tone Switch

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3.1. Function buttons
F1: MA 25 : Select the Right ear.
MA 25e : Toggle between right and left.
F2: MA 25 : Select the Left ear.
MA 25e : Store threshold.
F3: Pulse –Pulse Off: Manual tone presentation; Pulse On: Pulsing Tone will be presented when tone switch
is pressed.
F4: Warble - Warble off: Pure tones will be presented. Warble on: Warble tones will be presented.
3.2. MA 25e Special Functions
Talk Forward: On the MA 25e Talk Forward is activated by holding down the hearing level db rotary wheel.
While holding down the Talk button, the talk forward level can be adjusted.
The following F-key functionalities can be accessed by pressing the frequency rotary wheel:
F1: Delete all thresholds stored in the internal memory of the MA 25e.
F2: Store a Not Heard threshold point.
F3: Display the L/R thresholds stored in the internal memory of the MA 25e.
F4: Start the Hughson-Westlake (HW) automatic test procedure. Please refer to the next chapter for instructions about how to
setup the HW test.

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3.3. Display
Tone: A tone presentation indicator is provided in the top left corner of the display header.
Response: When using the patient response switch, a response is indicated in the middle of display header.
Power On or Battery status: The power status of the MA 25 is indicated in the top right corner of the display
header.
The icon will change depending on whether the instrument is powered via an external source (power supply or USB
connection to computer) or batteries.
When powered by batteries, the battery icon will change depending on the battery power level. When batteries are
running low the display will read Low Battery and flash.
The Power Off settings of the instrument can be adjusted at different time intervals or set to never power off –
please see Setup section for details.

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4. Performing tone audiometric tests
Hearing threshold levels can be determined by presenting test signals to the test subject with the included
earphones (air conduction –AC). The purpose of AC audiometry is to establish the hearing sensitivity at various
frequencies. The test can specify the AC loss but cannot distinguish between abnormality in the conductive
mechanism and sensorineural mechanism.
The patient should sit at a distance of at least 1 m from the device.
Eliminate any obstructions which will interfere with the placement of the earphone cushions on the ear (i.e. hair,
eyeglasses).
Ensure that the headphones are positioned correctly: Red side on the right ear, blue side on the left ear. Adjust the
headband of the headphones so that the earphones are positioned at the correct height (i.e. the sound output grid
exactly facing the ear canal).
Prior to hearing threshold level measurements, the following instructions should be given. "You will now hear a
variety of pitches with various loudness levels. Please push the response switch when you hear a tone and release
the button when you no longer hear it. If not using the response switch, ask the patient to “raise their left or right
hand when you hear the tone in the left or right ear".

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Threshold Determination:
The test normally starts at 1000 Hz on the patient's better ear with the L/R switch adjusted accordingly. A
procedure of “down 10dB, up 5dB” is typically utilized to establish a threshold at each frequency.
Screening:
A hearing screening produces a “pass” or “refer” result and is used to determine if a patient should receive further
evaluation to determine if a hearing problem exists. Patients are typically screened at a level of 20dB HL at 500,
1000, 2000, and 4000HZ in each ear. If a patient hears all the tones in each ear, the result would be considered a
“pass.” Failure to hear any of the tones in either ear would result in a “refer”. This is an example of one screening
protocol. Each state may have their own screening protocol. Please contact your state health department for
guidelines in your area.
Attention: Background noise can produce false test results, especially at lower frequencies.
For hygienic reasons, it is important to clean the headphone ear cushions after testing.
4.1. Auto Threshold:
In addition to traditional manual testing, the MA25e incorporates a
Hughson-Westlake patient controlled automatic threshold test complying
with ISO 8253. When the test is completed the results are easily recalled
from the internal memory of the MA25e.
Hughson-Westlake is a procedure used to determine puretone thresholds. The MA 25e utilizes this procedure to perform an
automatic pure tone test procedure. Threshold is defined as 2 out of 3 (or 3 out of 5) correct responses obtained at a certain
level in a 10 db decrease and 5 dB increase procedure.

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5. Setup menu
To access the MA 25 Setup menu press F1 and F4 simultaneously for 2-3 seconds.
F1
Change setting
F2
Browse up in the setup menu
F3
Browse down in the setup menu
F4
Save settings and Back to previous screen display –see below for details
Power Up Tone
Press Change to toggle between Manual and Reverse. Man: Tone is presented as long as the Tone Switch is
activated. Rev: Tone will be interrupted if Tone Switch is activated.
Power Up Ear
Press Change to toggle between Right and Left ear as the default ear for Power Up
Default Intensity
The default intensity when changing ear side is 20 dB.
Choose between: Off, -10dB, -5dB, 0dB, 5dB, 10dB, 15dB, 20dB, 25dB, 30dB,
35dB, 40dB, 45dB, and 50dB.
Intensity Steps
Choose between 1 dB, and 5 dB.

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Power Off Settings
Press Change to toggle between Never, 1, 2, 3, 4, or 5 minutes.
Pulse Length
Press Change to toggle between 250 msec and 500 msec.
Language
Press Change to toggle between English, German, Spanish, and French.
LCD Contrast
Press Change to toggle between settings ranging from 0 (very bright) to 6 (very
dark).

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HW Test... (only on MA 25e)
Press Change to go to the Hughson-Westlake (HW) automatic test procedure setup.
Press Change to toggle between
Familiarization On/Off. Familiarization is
used to train the patient
Press Change to toggle between “2
correct out of 3 answers” and “3 correct out of 5 answers”. The conditions used
before going to the next frequency.
Select the frequencies to include in the HW
test. Press Change to toggle between
frequencies On/Off.
Press Save to return to the main HW setup menu.
Frequencies
Press Change to access the default frequency range from 125 Hz to 8 kHz for daily
operation.
10 frequencies are available to change: 125; 250; 500; 750; 1,500; 2,000; 3,000;
4,000; 6,000; and 8,000.
Press Change to toggle between On or Off.
Press Save to return to the main Setup menu
License
Press Change to access the license key of the MA 25.
Press Change to enter and modify the
license key. Use the Hearing Level dB dialer to change the letter and
Frequency Hz dialer to move the cursor. Press Save to return to the
main Setup menu.
About
Press Change to access the information in the About section.

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6. Warranty and disclaimer
Warranty, Maintenance and After-Sales Service Hardware
The MA 25 audiometer is guaranteed for 1 year. This warranty is extended to the original purchaser of the
instrument by MAICO through the Distributor from whom it was purchased and covers defects in material and
workmanship for a period of one year from date of delivery of the instrument to the original purchaser.
The audiometer may be repaired only by your dealer or by a service center recommended by your dealer. We urgently advise
you against attempting to rectify any faults yourself or commissioning non-experts to do so.
In the event of repair during the guarantee period, please enclose evidence of purchase with the instrument. In
order to ensure that your instrument works properly, the audiometer should be checked and calibrated at least once
a year. This check-up needs to be conducted by your dealer.
When returning the instrument for repairs it is essential to also send the headphone and other accessories. Send the
device to your dealer or to a service center authorized by your dealer. Please also include a detailed description of
the faults.
In order to prevent damage in transit, if possible please use the original packing when returning the instrument.

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7. Care and maintenance
Disconnect the unit’s energy source before cleaning!
If the surface of the instrument or parts of it is contaminated, it can be cleaned using a soft cloth moistened with a
mild solution of water and dish washing cleaner or similar. The use of organic solvents and aromatic oils must be
avoided.
After each examination of a patient, it should be ensured that there is no contamination on the parts in connection
with the patient. General precautions must be observed in order to avoid that disease from one patient is conducted
to others. If ear cushions are severely contaminated, it is strongly recommended to remove them from the
transducer before they are cleaned with a disinfectant. The use of organic solvents and aromatic oils must be
avoided.
Always disconnect the unit’s energy source before the cleaning process, and be careful that no fluid enters the
inside of the instrument or the accessories; no alcohol or spirits should be used.

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8. Safety regulations
8.1. Electrical safety:
8.2. The MA 25 is in compliance with Class B of EN 60601-1. The instrument is not to be used in environments
dealing with explosive material or equipment.
8.3. Measurement safety:
8.4. In order to ensure safety and quality of the measurement, an annual inspection and calibration should be
performed. The annual check-ups can be performed by one of MAICO’s authorized service centers.
8.5. Instrument handling:
8.6. The instrument should be checked once a week.
8.7. Operation:
8.8. The instrument should only be handled and operated by trained personnel (audiologists, ENT doctors, or
trained technicians).

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9. Technical data
Standards:
Audiometer : EN 60645-1/ANSI S3.6, Type 4
Safety : EN 60601-1
EMC : EN 60601-1-2
Frequencies and Maximum Intensities:
Freq. Hz.
AC (Air Condition) dB HL
125
70
250
90
500
100
750
100
1000
100
1500
100
2000
100
3000
100
4000
100
6000
100
8000
90
Inputs: Patient response switch, USB-Power-Supply
Outputs: Left AC, Right AC
Attenuator: -10 to 100 dB HL in 5 dB steps.
Tone Presentation: Manual or reverse (chosen in Setup Menu);
Multiple pulses 250 or 500 msec (chosen in Setup Menu); On/Off; pure tone or warble tone
Talk Forward: Built in talk forward microphone. 0-11dB SPL. Continuously adjustable on
operation panel