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
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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.