Title:
Welch Allyn MicroTymp® 4
Tympanometer
User Manual
© 2021 Welch Allyn. All rights are reserved. To support the intended use of the product described in this publication, the
purchaser of the product is permitted to copy this publication, for internal distribution only, from the media provided by Welch
Allyn. No other use, reproduction, or distribution of this publication, or any part of it, is permitted without written permission
from Welch Allyn. Welch Allyn assumes no responsibility for any injury to anyone, or for any illegal or improper use of the
product, that may result from failure to use this product in accordance with the instructions, cautions, warnings, or statement
of intended use published in this manual.
For information about any Welch Allyn product, contact Welch Allyn Technical Support: www.welchallyn.com/about/
company/locations.htm.
93790 This manual applies to 901033 TYMPANOMETRIC INSTRUMENT.
GSI D-0122381 Rev. C
WA DIR 80024157 Ver. C
Revision date: 2021-01
Distributed by Welch Allyn, Inc.
4341 State Street Road
Skaneateles Falls, NY 13153-0220 USA
www.welchallyn.com
Grason-Stadler
10395 West 70th Street
Eden Prairie, MN 55344 USA
GSI is an ISO 13485 certified corporation.
Grason-Stadler
c/o DGS Diagnostics A/S
Audiometer Alle 1
5500 Middelfart
Denmark
0123
Caution: US Federal law restricts this device to sale by or on the order of a physician or licensed
hearing care professional.
Welch Allyn MicroTymp® 4 Tympanometer
User Manual
DIR 80024157 Ver C Page i
TABLE OF CONTENTS
TABLE OF CONTENTS ....................................................................................................................................................... i
Preface ........................................................................................................................................................................... v
Manual Conventions ............................................................................................................................................................v
Regulatory Symbols ............................................................................................................................................................ vi
Device Symbols ................................................................................................................................................................. viii
Important Safety Instructions ............................................................................................................................................. ix
Precautions ......................................................................................................................................................................... ix
Electromagnetic compatibility (EMC) considerations .......................................................................................................... x
Warranty ............................................................................................................................................................................. xi
Recycling / Disposal ............................................................................................................................................................ xi
Introduction ................................................................................................................................................................... 2
Indication for Use ............................................................................................................................................................... 2
Intended Use ...................................................................................................................................................................... 2
Contraindications ................................................................................................................................................................ 3
Description and Operating Principles ................................................................................................................................. 3
Admittance measurement .............................................................................................................................................. 3
Tympanogram ................................................................................................................................................................. 3
Acoustic reflex measurement ......................................................................................................................................... 3
Installation ..................................................................................................................................................................... 5
External Inspection ............................................................................................................................................................. 5
Unpacking ........................................................................................................................................................................... 5
Standard contents .............................................................................................................................................................. 5
Initial Set Up ....................................................................................................................................................................... 6
Power supply ...................................................................................................................................................................... 6
Cradle Connections ............................................................................................................................................................. 6
Cradle LED Indicators .......................................................................................................................................................... 7
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User Manual
DIR 80024157 Ver C Page ii
Handset……… ...................................................................................................................................................................... 8
Handset LED Indicators ....................................................................................................................................................... 9
Handset probe .................................................................................................................................................................... 9
Printer………. ........................................................................................................................................................................ 9
Operation and Configuration ........................................................................................................................................ 10
Start-up and menu displays .............................................................................................................................................. 10
Main Menu Options ..................................................................................................................................................... 10
Configuration .................................................................................................................................................................... 11
Test sequence ............................................................................................................................................................... 13
Ear seal check................................................................................................................................................................ 13
Reflex levels .................................................................................................................................................................. 13
Reflex frequencies ........................................................................................................................................................ 13
Reflex selection ............................................................................................................................................................ 13
Reflex threshold ........................................................................................................................................................... 13
Reflex auto-stop ........................................................................................................................................................... 13
Reflex polarity .............................................................................................................................................................. 14
Reflex filter ................................................................................................................................................................... 14
Set Time/Date ............................................................................................................................................................... 14
Power Off Delay ............................................................................................................................................................ 14
LCD Contrast ................................................................................................................................................................. 14
Report Cal Date............................................................................................................................................................. 14
Set Date Format ............................................................................................................................................................ 14
Hospital Name .............................................................................................................................................................. 14
Department .................................................................................................................................................................. 15
Reload Defaults ............................................................................................................................................................ 15
Language ....................................................................................................................................................................... 15
Data Collection ............................................................................................................................................................. 16
Prior to testing and Ambient conditions ........................................................................................................................... 16
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User Manual
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Ear tips….. ......................................................................................................................................................................... 16
Performing a test .............................................................................................................................................................. 17
Ear seal check ................................................................................................................................................................... 19
Error messages ................................................................................................................................................................. 23
Saving Results in the Database ..................................................................................................................................... 24
Data entry ......................................................................................................................................................................... 24
Database full ..................................................................................................................................................................... 25
Sending the Results to a Printer .................................................................................................................................... 26
Printing results .................................................................................................................................................................. 26
Data Management ........................................................................................................................................................ 27
List records........................................................................................................................................................................ 27
Delete records .................................................................................................................................................................. 28
Print records ..................................................................................................................................................................... 28
Performing Daily Checks ............................................................................................................................................... 29
Routine Maintenance ................................................................................................................................................... 31
Cleaning the MicroTymp 4 ................................................................................................................................................ 31
Eartip and Probe ............................................................................................................................................................... 31
Calibration and Repair of the Instrument ......................................................................................................................... 32
Error Messages & Fault Conditions ............................................................................................................................... 34
Ordering Consumables and Accessories ........................................................................................................................ 36
Ear Tips – Single Use ......................................................................................................................................................... 36
Appendix - Menu Summary .......................................................................................................................................... 37
Main menu........................................................................................................................................................................ 37
Sub-Menu selections ........................................................................................................................................................ 37
Appendix - Technical Specification ................................................................................................................................ 41
Equipment classification ................................................................................................................................................... 45
Audiometric Standards ..................................................................................................................................................... 45
Appendix - EMC Guidance & Manufacturer’s Declaration ............................................................................................. 46
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Electromagnetic Compatibility ......................................................................................................................................... 46
Electrical Safety, EMC and Associated Standards ............................................................................................................. 46
Appendix - Use with Non-medical Electrical Equipment................................................................................................ 47
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User Manual
DIR 80024157 Ver C Page v
PREFACE
This user manual provides information about the Welch Allyn MicroTymp 4 tympanometer. This
manual is intended for technically qualified personnel. Please note: This User Manual is not
intended as a training manual for tympanometry. The reader should consult standard audiology
texts for the theory and application of the screening tests provided by this instrument.
MANUAL CONVENTIONS
Throughout this manual, the following meaning of warnings, cautions and notices are used.
WARNING
The WARNING symbol identifies conditions or practices that may present danger to
the patient and/or user.
CAUTION
The CAUTION Symbol identifies conditions or practices that could result in damage
to the equipment
NOTE: Notes help you identify areas of possible confusion and avoid potential problems
during system operation
Welch Allyn MicroTymp® 4 Tympanometer
User Manual
DIR 80024157 Ver C Page vi
REGULATORY SYMBOLS
Symbol
Description
Conforms to European Medical Device Directive 93/42/EEC
Symbol for "SERIAL NUMBER"
Regulatory Product Identifier (RPI) number
Welch Allyn Part Number
Return to Authorized Representative, Special disposal required
Symbol for “European Representative”
Symbol for “Manufacturer”
Symbol for “Date of Manufacture”
Symbol for “Caution”
Type B Applied Part according to IEC 60601-1
Consult Operating Instructions
On/Off - Next to power mains
Keep Dry
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User Manual
DIR 80024157 Ver C Page vii
Symbol
Description
This side up
Follow Instructions for Use
Consult the operating instructions/directions for use.
A copy of the operating manual is available on this website:
www.welchallyn.com/mt4
A printed copy of the operating instructions can be ordered from
Welch Allyn for shipment within 7 days
Welch Allyn MicroTymp® 4 Tympanometer
User Manual
DIR 80024157 Ver C Page viii
DEVICE SYMBOLS
The following symbols appear on the tympanometer, the instrument cradle or the mains adapter:
Definition: Consult operating instructions.
Definition: Type B applied part – an applied part providing protection against
electric shock, particularly regarding allowable patient leakage current and patient
auxiliary current.
The applied part is the ear tip.
Definition: The output from the mains AC adapter is Direct Current.
Definition: Class II equipment – equipment in which protection against electric
shock does not rely on basic insulation only, but in which additional safety
precautions such as double insulation or reinforced insulation are provided,
there being no provision for protective earth connection or reliance upon
installation conditions.
USB Definition: Industry-standard Type-B USB connection to a computer.
Definition: printer connection.
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User Manual
DIR 80024157 Ver C Page ix
IMPORTANT SAFETY INSTRUCTIONS
WARNING
The Welch Allyn MicroTymp 4 instrument must be used only by medical
professionals including, but not limited to, Physicians, Physician Assistants, Nurse
Practitioners, Nurses, Audiologists and Medical Technologists knowledgeable in the
theory and application of the screening tests provided by this instrument. It is intended for
transient use as a screening and diagnostic tool; however no surgical or medical procedure should
be undertaken solely on the basis of results obtained from the instrument.
PRECAUTIONS
READ THIS USER MANUAL BEFORE ATTEMPTING TO USE THE
INSTRUMENT
Users should use their professional skills when interpreting the results and this should be done
in conjunction with other testing as deemed appropriate given their professional skills. Incorrect
use could lead to wrong results.
To comply with the standards IEC 60601-1 for safety and IEC 60601-1-2 for EMC the
tympanometer is designed to be used only with the medically-approved mains adapter supplied,
which is specified as part of the equipment. Do not use any other type of mains adapter with
this instrument.
The tympanometer is for indoor use only and should be used only as described in this manual.
Before the first use of the instrument each day, or if suspect or inconsistent results are apparent,
the checks specified in the Performing Daily Checks section should be carried out. If the system
is not functioning properly, do not operate it until all necessary repairs are made and the unit is
tested and calibrated for proper functioning.
Never insert the probe into a patient’s ear canal without a suitable ear tip fitted to the probe.
Use only the recommended disposable ear tips. These are for single use only - that is, each ear
tip is intended to be used once only for a single ear for a single patient. Do not reuse ear tips as
this will pose the risk of ear-to-ear or patient-to-patient cross infection.
Latex is not used anywhere in the manufacturing process. The base material for the ear tips is
made from silicone rubber.
Welch Allyn MicroTymp® 4 Tympanometer
User Manual
DIR 80024157 Ver C Page x
Do not immerse the unit in any fluids. See the Routine Maintenance Section of this manual for
the proper cleaning procedure for the instrument and its accessories and the function of single-
use parts.
Do not use the instrument in an oxygen-rich environment or in the presence of a flammable
anesthetic mixture or other flammable agents.
Thermal paper printouts fade with exposure to light or heat. Photocopying the patient record
test results will ensure a more permanent record is kept.
Do not drop or otherwise impact this instrument. If the instrument is dropped or damaged, return
it to the manufacturer for repair and/or calibration. Do not use the instrument if any damage is
suspected.
The instrument must be stored and used indoors within the specified temperature, pressure and
humidity ranges.
As with all instruments of this nature the measurements taken will be influenced by significant
changes in elevation and pressure. See Daily Check section for more information.
Do not attempt to open, modify or service the instrument. Return the instrument to the
manufacturer or distributor for all repair and servicing requirements. Opening the instrument
will void the warranty.
This instrument contains a rechargeable Nickel-Metal Hydride (NiMH) battery-pack. The battery
is not intended to be changed by the user. Batteries may explode or cause burns, if disassembled,
crushed or exposed to fire or high temperatures. Do not short-circuit.
ELECTROMAGNETIC COMPATIBILITY (EMC) CONSIDERATIONS
Medical electrical equipment needs special precautions regarding EMC and needs to be installed
and put into service according to the EMC information in the Appendix. This provides guidance
on the electromagnetic environment in which to operate the instrument.
Portable and mobile radio-frequency (RF) communications equipment can affect medical
electrical equipment. The instrument should not be used adjacent to or stacked with other
equipment; if this is unavoidable the instrument should be observed to verify normal operation.
Welch Allyn MicroTymp® 4 Tympanometer
User Manual
DIR 80024157 Ver C Page xi
WARRANTY
We, Welch Allyn, warrant that this product is free from defects in material and workmanship and,
when properly installed and used, will perform in accordance with applicable specifications. If
within one year after original shipment, it is found not to meet this standard; it will be repaired,
or at our option, replaced at no charge except for transportation costs, when returned to an
authorized Welch Allyn facility
NOTE: Changes in the product not approved in writing by Welch Allyn shall void this
warranty. Welch Allyn shall not be responsible for any indirect, special or consequential
damages, even if notice has been given in advance of the possibility of such damages. The
pressure pump and transducers may go out of calibration due to rough handling or impact
(dropping). The lifetime of probe, probe seals and eartips is dependent upon conditions of
use. These parts are only guaranteed against faulty materials or manufacture.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING
BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.
RECYCLING / DISPOSAL
Directive 2002/96/EC-WEEE:
Disposal of noncontaminated electrical and electronic equipment
Many local laws and regulations require special procedures to recycle or dispose of electrical
equipment-related waste including batteries, printed circuit boards, electronic components,
wiring and other elements of electronic devices. Follow all your respective local laws and
regulations for the proper disposal of batteries and any other parts of this system. Do not dispose
of this product as unsorted municipal waste. Prepare this product for reuse or separate collection
as specified by Directive 2002/96/ EC of the European Parliament and the Council of the
European Union on Waste Electronic and Electrical Equipment (WEEE). If this product is
contaminated, this directive does not apply.
For specific disposal or compliance information contact, contact Welch Allyn Technical Support.
4341 State Street Road, Skaneateles Falls, NY 13153 www.welchallyn.com
INTRODUCTION
Thank you for purchasing a Welch Allyn MicroTymp 4, a hand-held, portable tympanometer that
will give many years of reliable service if treated with care. The instrument performs two types
of measurement:
Tympanometry is used to measure the admittance of the tympanic membrane and middle ear
at a fixed frequency over a range of pressures.
Acoustic Reflex tests are used to measure stapedial reflexes. The MicroTymp 4 measures
ipsilateral reflexes and, when selected, reflex measurement is automatically carried out after a
tympanogram is taken.
Features
Automatic measurement of ear canal volume, tympanic admittance peak, placement of
the peak and the gradient
Automatic detection of stapedial reflexes
Up to 32, dual-ear patient tests can be stored in non-volatile memory
Configurable settings for user preferences, held in non-volatile memory
Printout of data to a printer
English, German, French, Spanish, Portuguese or Italian operating language (selectable by
the user)
INDICATION FOR USE
The Welch Allyn MicroTymp 4 is intended to be used for the measurement of acoustic
impedance/admittance within the human external ear canal. These measures are useful in the
evaluation, identification, documentation and diagnosis of ear disorders. The device is intended
to be used on patients of any age.
INTENDED USE
The Welch Allyn MicroTymp 4 is an auditory impedance tester intended to detect possible
otologic disorders associated with the functioning of the middle ear. It is intended to be used in
a hospital, clinic or other healthcare facility with a suitable quiet testing environment such as a
private exam room.
DIR 80024157 Ver C Page 3
CONTRAINDICATIONS
Ear canal examination with an illuminated otoscope is an essential prerequisite to successful
middle-ear testing. Make sure that the canal is free of any obstruction. If the canal is completely
plugged at the entrance or if fluid is running from the ear canal, tympanometry should not be
attempted until the condition is cleared. Testing should not be performed on patients with
conditions listed below without a medical doctor’s approval.
Recent stapedectomy or other middle ear surgery
Discharging ear
Acute external auditory canal trauma
Discomfort (e.g. severe otitis externa)
Presence of tinnitus, hyperacusis or other sensitivity to loud sounds may contraindicate
testing when high intensity stimuli are used
DESCRIPTION AND OPERATING PRINCIPLES
The Welch Allyn MicroTymp 4 is clinical aural acoustic impedance/admittance instrument (Type
2). The main components of the instrument consist of a hand held unit with an LCD and a probe
assembly and a cradle. A printer, eartips and test cavity are included with the system.
The probe contains one microphone, two receivers and an air channel. One of the receivers is
used for probe tone signal. The second receiver is used for the acoustic reflex stimulus signal.
The microphone measures the response. The air channel is connected to the pump system which
makes it possible to supply the eardrum with air pressure
ADMITTANCE MEASUREMENT
The MicroTymp 4 measures the admittance of the tympanic membrane and middle ear by playing
a continuous 226Hz tone into the ear canal at a level calibrated to give 85dB SPL into a 2ml cavity.
The sound level this produces in the ear canal is measured using a microphone and the
admittance calculated from the result. In line with normal audiometric practice admittance is
displayed as an equivalent volume of air in ml.
TYMPANOGRAM
To record the tympanogram the admittance is measured while the air pressure in the ear canal
is varied from +200daPa to -400daPa by means of a small pump. The admittance peaks when the
air pressure is the same on both sides of the tympanic membrane. The changing admittance with
pressure is displayed as a graph.
ACOUSTIC REFLEX MEASUREMENT
Using the same principle, it is also possible to establish whether an acoustic reflex is present. In
this case, the 226Hz tone is used to measure the admittance of the ear, while a short tone at a
DIR 80024157 Ver C Page 4
different frequency is presented (the reflex stimulus). The sound pressure level (SPL) of this
stimulus is increased in steps until the middle ear muscles respond causing the tympanic
membrane to become stiffer, or a preset maximum SPL is reached. When the change in
admittance exceeds a predetermined threshold, this constitutes a reflex and the change in
admittance at that level when the stimulus is applied is displayed as a plot against time.
The acoustic reflex is measured at the static ear canal pressure that produces the maximum
membrane admittance, so reflex measurements are taken after the tympanogram is measured
when the peak admittance pressure has been established.
The MicroTymp 4 can measure an acoustic reflex at any combination of 500Hz, 1000Hz, 2000Hz
and 4000Hz. The maximum level for the reflex stimulus may be preset, along with the step size
in dB between the three preceding lower levels of stimulus.
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INSTALLATION
EXTERNAL INSPECTION
Although this Welch Allyn MicroTymp 4 was carefully tested, inspected, and packed for shipping,
it is good practice after receiving the instrument to immediately examine the outside of the
container for any signs of damage. Notify the carrier if any damage is observed.
UNPACKING
Please retain the carton and packaging as the tympanometer will need calibrating on an annual
basis and should be returned to the distributor or Welch Allyn in its original shipping carton.
Please check the contents of the shipping carton against the delivery note to make sure that all
items ordered have been included. If anything is missing, please contact the distributor who
supplied the tympanometer or Welch Allyn.
STANDARD CONTENTS
MicroTymp 4 handset (P/N 93701)
MicroTymp 4 charging cradle (P/N 93710)
Power supply (P/N 93715)
4 in 1 calibration test cavity (P/N 93750)
Eartip/Probe Tip Starter kit (P/N 93720)
Probe Floss Cleaning Kit (P/N 93730)
User Manuals (on USB Thumb Drive) (P/N 93790-X)
USB cable (A/B 2 meters) (P/N 39414)
Serial Printer Cable (P/N 39771)
Calibration certificate
MPT-II Printer Set (P/N 39410) Includes, MPT-II printer, battery, power supply/battery
charger and printer paper (Not included with 93700-NP)
DIR 80024157 Ver C Page 6
INITIAL SET UP
Place the cradle on a stable counter or table where it will be used. The location should be near a
properly grounded wall outlet. When placing the handset in the cradle make sure that the
connectors on the handset and cradle align.
POWER SUPPLY
The Welch Allyn MicroTymp 4 tympanometer is designed for continuous operation and is
powered by a rechargeable Nickel-Metal Hydride (NiMH) battery-pack which is fitted in the
instrument. If the instrument is placed onto its cradle the battery within it will be charged.
The mains adapter is supplied and specified as part of the equipment. Connect the output lead
from the adapter into the power socket on the rear of the instrument cradle. Switch on the mains
supply - the indicator on the adapter will illuminate green. The mains adapter is the mains
disconnect device and therefore the tympanometer should be positioned such that easy access
to the mains adapter is possible.
The output from the mains adapter is fitted with electronic circuit protection. In case of overload
the adapter will shut down and the indicator will be off. When the fault is cleared the adapter
will operate as normal.
The input to the mains adapter is protected with a non-replaceable fuse. If this fails, the adapter
will not operate and will need to be replaced. If a replacement mains adapter is required, please
contact your Welch Allyn distributor.
CRADLE CONNECTIONS
The cradle connections are labeled to ensure correct identification and connection as follows:
Socket Label
Socket Type
Connected Part
DIR 80024157 Ver C Page 7
RJ6 socket
Supplied printer *
5V 0.2A
2.5mm power jack
Mains AC/DC Adapter *
USB
USB connector
Type B
Computer (via USB port)
WARNING
For connected parts marked * only connect the parts or accessories supplied with
the instrument or supplied by Welch Allyn or a Welch Allyn distributor. These parts
have been tested for use with the Welch Allyn MicroTymp 4 tympanometer for
compliance with the standards IEC 60601-1 and IEC 60601-1-2. The use of accessories other than
those specified may compromise compliance with these standards.
CRADLE LED INDICATORS
The LED indicators on the instrument cradle show the status of the mains connection and the
battery charging.
LED displays green when power is applied to the cradle;
otherwise it will be off.
LED shows green when the handset is in the cradle and its
internal battery pack is charging; it will be off when the
handset is removed.
DIR 80024157 Ver C Page 8
HANDSET
Press the On/Off key momentarily to turn the Welch Allyn MicroTymp 4 on (refer to the diagram
above). No warm-up time is required, although a short diagnostic routine will run for a few
seconds. During this time the internal pump will operate. To switch off, again press and hold the
On/Off key for a few seconds.
Press the up ▲ and down ▼ navigation keys to scroll through the menus or set values
Press the right navigation key ► to accept a menu choice or go to the next step.
Press the left navigation key ◄ to cancel an operation or go back to the previous step.
The function of the left and right keys is usually shown on the bottom line of the display.
When not located in the cradle and not performing a test the Welch Allyn MicroTymp 4 will switch
off automatically if no key is pressed for 90 seconds. This time may be extended to 180 seconds
in the CONFIGURATION menu.
LCD
Display
On/Off
Button
Navigation
Buttons
LED
Indicators
Probe
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