MicroTymp 3 portable tympanometric instrument ® Directions for use
ii Welch Allyn MicroTymp3 portable tympanometric instrument © 2009 Welch Allyn. All rights are reserved. No one is permitted to reproduce or duplicate, in any form, this manual or any part thereof without written permission from Welch Allyn.
iii Contents 1 - Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Intended use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 About the device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv Contents Welch Allyn MicroTymp3 portable tympanometric instrument Normative values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Interpreting 226-Hz tympanogram results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Normal middle ear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Low admittance tympanograms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Directions for use Contents v C - Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Technical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Probe tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vi Contents Welch Allyn MicroTymp3 portable tympanometric instrument
1 Introduction About this document This document is written for clinical professionals who are qualified to perform tympanometry. The intended clinical environment is any location where tympanometry is performed (including but not limited to hospitals, clinics, medical offices, and schools). This document describes how to operate and maintain the MicroTymp Handle and Printer/ Charger.
Introduction Welch Allyn MicroTymp3 portable tympanometric instrument Controls, indicators, and connectors Handle components Front view 2 GR A Ya - mmho 1.0 Tip 1 0.
Directions for use Introduction Printer/Charger components CHARGE indicator FEED button PRINT button Tip box POWER indicator Charging well for MicroTymp 2 or 3 IEC power cord receptacle Printer/Charger switches Card holder with 1000-Hz screening results cards Paper access cover Paper slot Power Cord To power receptacle To IEC power cord receptacle 9
Introduction Welch Allyn MicroTymp3 portable tympanometric instrument Symbols Documentation symbols Warning (Warnings indicate conditions or practices that could lead to illness, injury, or death.
Directions for use Introduction Certification symbols Complies with applicable U.S.
Introduction Welch Allyn MicroTymp3 portable tympanometric instrument General warnings WARNING Explosion risk. Do not use MicroTymp Handle or Printer/Charger near flammable anesthetics. WARNING Electric shock hazard. Do not attempt to disassemble the Printer/ Charger. Refer all servicing to Welch Allyn or a Welch Allyn authorized service representative. WARNING Electric shock hazard.
Directions for use Introduction 13 Caution Do not store either the Handle or Printer/Charger at temperatures below -20°C (-4°F) or above +49°C (120°F). Continual exposure to extremely low or high temperatures can permanently damage components. Caution The battery must be removed if the Handle is to be stored or placed anywhere other than in the powered Printer/Charger for more than one month. Failure to do this can result in damage to the Handle.
Introduction Welch Allyn MicroTymp3 portable tympanometric instrument 2. Remove the battery cover by lifting the bottom of the cover away from the probe tip. 3. Insert the battery by placing the positive (+) end of the battery against the contact in the holder. Push the battery lightly to compress the contact, and lower the battery into the compartment. Note Insert the battery only as shown. Failure to observe the correct polarity will prevent the instrument from functioning.
Directions for use Introduction Charge the handle 1. Before first use, place the Handle (with battery installed) into the Printer/Charger charging well with the LCD and buttons facing you. 2. Leave the Handle in the well for a minimum of 16 hours to achieve a full charge. You are now ready to take a test. See Ch. 2 for instructions to take a test.
Introduction Welch Allyn MicroTymp3 portable tympanometric instrument
2 Completing a test Obtaining a tympanogram Select a probe tip 1. After examining the subject's ear canal opening, select a tip which is large enough to seal the entrance of the ear canal. To change tips, either pull the tip off by hand or slide the tip ejector towards the tip. Note Tips are not intended to be deeply inserted into the ear canal. Using an improper tip size causes leaks, and will make it difficult to complete a test. Use only MicroTymp3 tips with the MicroTymp3 Handle.
Completing a test Note Welch Allyn MicroTymp3 portable tympanometric instrument Time-out feature. The tympanometer automatically turns off 15 seconds after the last test or button activation. 0.5 GR C 0 -400 2 GR A 1.0 1 0.5 GR C 0 -200 0 200 -400 PRESSURE - daPa Note +200 Vea - cc 1 Ya - mmho 2 GR A 1.0 +200 Vea - cc Ya - mmho 2. Press the TEST button below the Liquid Crystal Display (LCD) to show the current frequency. One of the screens shown below will appear.
Directions for use Completing a test 19 Note Because of changes in air pressure during a test, the subject will feel slight pressure in the ear canal. During the brief seconds when tympanometric measurements are made, it is important that the clinician's hand is steady, and that the subject does not talk, yawn, chew gum, cry, or move the head. Note If the BLOCK, LEAK, or OPEN messages appear during the test, reposition the tip to restart the test.
Completing a test Welch Allyn MicroTymp3 portable tympanometric instrument Store and display data 1. To store the results of the test, press the button which matches the tested ear, as illustrated below. The memory buttons are labeled R for the right ear and L for the left ear. When test results are stored in memory, the RIGHT STORE or LEFT STORE message appears momentarily on the LCD.
Directions for use Completing a test 21 3. Remove the Handle cover by lifting the bottom of the cover away from the probe tip. + REF 72910 Lithium 4. With a sharp, non-conductive object (like a toothpick or the wooden end of a Q-tip), move switch 1 to the desired position as shown below. Caution Potential damage to Handle. Do not use the screwdriver provided or any other metal object to move the switch.
Completing a test Welch Allyn MicroTymp3 portable tympanometric instrument
3 Understanding the LCD messages The following messages may be displayed on the LCD during Handle operation. 2 GR A 1.0 1 0.5 GR C 0 -400 -200 0 +200 Vea - cc Ya - mmho Company identification 200 PRESSURE - daPa The Welch Allyn message will appear when you press any button. GR C 0 -400 -200 0 PRESSURE - daPa 200 2 GR A 1.0 1 0.5 0 -400 GR C -200 0 +200 Vea - cc 1 0.5 Ya - mmho 2 GR A 1.
Understanding the LCD messages Welch Allyn MicroTymp3 portable tympanometric instrument 0 -400 GR C -200 0 1 0.5 0 -400 200 2 GR A 1.0 PRESSURE - daPa GR C -200 0 +200 Vea - cc 1 0.5 Ya - mmho 2 GR A 1.0 +200 Vea - cc Ya - mmho Open 200 PRESSURE - daPa The test has not begun since a valid ear cavity has not been detected.
Directions for use Understanding the LCD messages 25 Block The test cannot continue since the measured admittance is less than 0.2 mmho. Possible causes: • Probe tip is lodged against canal wall • Ear canal occluded • Collapsed ear canal • Extremely small ear • Probe tip is clogged with cerumen Possible solutions: • Reposition the probe tip • Perform otoscopy to check for occlusion • Remove cerumen from probe tip 2 GR A Ya - mmho 1.0 1 0.
Understanding the LCD messages Welch Allyn MicroTymp3 portable tympanometric instrument Possible solutions: • Reposition probe tip • Patient and practitioner must remain still • Use a different size probe tip • Increase pressure against the ear If a leak condition occurs after -100 daPa pressure is reached at 226 Hz, results will remain on the display. If an identifiable peak is displayed at 226 Hz, you do not have to repeat the test.
Directions for use Understanding the LCD messages 2 GR A Ya - mmho 1.0 1 0.5 GR C +200 Vea - cc Low battery 0 -400 -200 0 200 PRESSURE - daPa The LOW BATT message indicates that the battery needs to be recharged. The system will not perform a test in a LOW BATT condition. All buttons are disabled to prevent inaccurate results due to inadequate battery voltage. Normal operation may be restored by recharging the battery or replacing the battery with a charged battery.
Understanding the LCD messages Welch Allyn MicroTymp3 portable tympanometric instrument 2 GR A 1.0 1 0.5 0 -400 GR C -200 0 +200 Vea - cc Ya - mmho Calibration due 200 PRESSURE - daPa Welch Allyn recommends annual calibration of your tympanometer to ensure equipment accuracy. The CAL DUE message will display each time the device is powered on when one year has passed since the last calibration.
Directions for use Understanding the LCD messages 29 0 GR C 0 -400 -200 0 200 -400 PRESSURE - daPa -200 0 2 GR A 1.0 1 0.5 GR C 0 -400 200 +200 Vea - cc 1 0.5 Ya - mmho GR C 2 GR A 1.0 +200 Vea - cc 1 0.5 Ya - mmho 2 GR A 1.0 +200 Vea - cc Ya - mmho System check -200 0 200 PRESSURE - daPa PRESSURE - daPa The SYS CHK (SYS CHK0, SYS CHK1) message indicates that the Handle is doing a selfcheck to ensure proper operation.
Understanding the LCD messages Welch Allyn MicroTymp3 portable tympanometric instrument
4 Interpreting test results When measured properly, tympanometric results are accurate and objective but should be interpreted in the context of the patient’s overall clinical condition. Tympanograms Key characteristics of the tympanogram 1 Static Admittance (Peak Ya) is a calculated measure of the compensated static acoustic admittance (height) of the tympanometric peak reported in acoustic s (mmho).
Interpreting test results Welch Allyn MicroTymp3 portable tympanometric instrument Gradient (width) measurements (226 Hz only) When a tympanometric tracing is complete, the device measures the gradient or width of the tympanogram. If the gradient is abnormal, an asterisk will appear on the LCD under GR/A for the adult's ear (greater than 10 years of age), or GR/C for the child's ear (10 years of age or younger). A sample of the Liquid Crystal Display appears below.
Directions for use Interpreting test results 33 Interpreting 226-Hz tympanogram results Normal middle ear A tympanogram with normal Peak Ya, gradient (width), and tympanometric peak pressure appears below. R RIGHT EAR Vea +200 1.5 2 Ya - mmho 1.0 1 0.5 0 -400 -200 0 200 PRESSURE - daPa Low admittance tympanograms Tympanogram with normal Peak Ya and abnormal gradient (width) L LEFT EAR Vea +200 1.5 2 Ya - mmho 1.0 1 0.
Interpreting test results Welch Allyn MicroTymp3 portable tympanometric instrument Tympanogram with low Peak Ya L LEFT EAR Vea +200 1.5 2 Ya - mmho 1.0 1 0.
Directions for use Interpreting test results 35 Negative and positive peak pressure tympanograms (left or right shift) Tympanogram with negative middle ear pressure LEFT EAR Vea +200 1.5 2 Ya - mmho 1.0 1 0.5 0 -400 -200 0 200 PRESSURE - daPa Conditions which cause negative middle ear pressure: • Eustachian tube dysfunction • Cold • Allergies • Vigorous sniffing Note Negative pressure within the middle ear space will produce a tympanogram with a negative tympanometric peak pressure.
Interpreting test results Welch Allyn MicroTymp3 portable tympanometric instrument Flat tympanograms Flat tympanogram with normal ear canal volume LEFT EAR Vea +200 1.5 2 Ya - mmho 1.0 1 0.5 0 -400 -200 0 200 PRESSURE - daPa Condition which causes a flat tympanogram with normal ear canal volume: • Middle ear effusion Flat tympanogram with increased ear canal volume LEFT EAR Vea +200 1.5 2 Ya - mmho 1.0 1 0.
Directions for use Interpreting test results 37 Tympanograms with artifact R RIGHT EAR Vea +200 1.5 2 Ya - mmho 1.0 1 0.5 0 -400 -200 0 200 PRESSURE - daPa Conditions which cause artifact: • Patient movement • Practitioner movement • Vocalizing or crying Note During the typanometric measurement, the clinician should keep a steady hand, and the patient should not talk, chew gum, yawn, cry, or move. If the display indicates too much artifact, the clinician must repeat the measurement.
Interpreting test results Welch Allyn MicroTymp3 portable tympanometric instrument Normative values The table below presents normative values for 1000-Hz tympanometry for NICU babies and full-term 2- to 4-week-old babies. [Margolis, R.H., Bass-Ringdahl, S., Hanks, W.D., Holte, K., Zapala, D.A. Tympanometry in Newborn Infants - 1 KHz Norms. J. Amer. Acad. Audiol., 14, 383-392, 2003.
Directions for use Interpreting test results 39 2 GR A 1.0 1 0.5 0 -400 GR C -200 0 +200 Vea - cc Ya - mmho Refer 200 PRESSURE - daPa Condition which causes a REFER message: • Peak Ya is less than 0.6 mmho Infants with middle ear effusion have lower Peak Ya at 1000 Hz, just as older children have reduced Peak Ya at 226 Hz. When the Peak Ya is less than 0.6 mmho, the test is indicative of abnormal middle ear function, most commonly middle ear effusion.
Interpreting test results Welch Allyn MicroTymp3 portable tympanometric instrument Influence of altitude As the altitude above sea level increases, the admittance of a given volume of air also increases. Therefore, equivalent ear canal volume (+200 Vea) overestimates actual ear canal volume as noted in the table below. To estimate ear canal volume, subtract the appropriate value in the table from the Vea Reading. Altitude can also affect MicroTest Cavity results.
5 Printing 226-Hz results Print memory contents Follow the steps listed below to print tympanometric data stored in the Handle: 1. Place the Handle in the well with the Liquid Crystal Display (LCD) and buttons facing you. When the Handle is properly seated in the well, the green CHARGE indicator illuminates. 2. Press the PRINT button. 3. To feed extra paper, press the FEED button. Paper continues to feed as long as the button is depressed.
Printing 226-Hz results Welch Allyn MicroTymp3 portable tympanometric instrument Printout formats A complete tympanometric printout is shown below. The printout is divided into three sections: tympanogram, data, and interpretive messages. Following is a detailed account of the information presented in each of these sections. For instructions on changing the format of the printout, see page 45.
Directions for use Printing 226-Hz results 43 Data section The data section displays numeric values for the four key characteristics of the tympanogram: • Static Admittance (Peak Ya) is a calculated measure of the compensated static acoustic admittance (height) of the tympanometric peak reported in acoustic millimhos (mmho). Given appropriate normative values, static admittance (Peak Ya) is a useful indicator of middle ear disease.
Printing 226-Hz results Welch Allyn MicroTymp3 portable tympanometric instrument Low Peak Height, Large Ear Volume Tympanogram Is Wide Negative Tympanometric Peak Pressure Positive Tympanometric Peak Pressure High Peak Height Normal Tympanogram The computer scans the list of messages and prints the first message that applies. The hierarchy is arranged so that the most clinically-important message is displayed first.
Directions for use Printing 226-Hz results 45 Change from manual to automatic printout Automatic vs. Manual Printout (Switch #1) Auto Print 1 2 3 4 Depress the ON portion of the switch to select this option. This causes the printout to begin automatically once the Handle is placed in the well, and data transfer is complete. OFF Manual Print 1 2 3 4 Depress the OFF portion of the switch to select this option. This causes the printout to begin only when the PRINT button is depressed.
Printing 226-Hz results Welch Allyn MicroTymp3 portable tympanometric instrument Print interpretive messages (Switch #2) No messages 1 2 3 4 Depress the ON portion of the switch to select this option. This causes messages which interpret the tympanogram to not be included on the printout. Refer to the Printout formats section on page 42 for more information on these messages. OFF Messages 1 2 3 4 Depress the OFF portion of the switch to select this option.
Directions for use Printing 226-Hz results 47 Printer function messages If tympanometric results are not printed, a message will appear describing the reason. These messages are listed in the table below. Printer messages Printer function message Possible cause Possible solution No Data Reinsert Handle The Handle is not located in the well. Seat the Handle in the well. The Handle is not seated properly in the well.
Printing 226-Hz results Welch Allyn MicroTymp3 portable tympanometric instrument
6 Maintenance and troubleshooting Maintain the equipment About the battery The rechargeable Lithium-ion battery is intended for many charge/discharge cycles and is warranted for two years. The warranty expiration date is imprinted on the battery. Caution Replace battery with Welch Allyn model #72910 battery only. Note Disassembly of the tympanometer beyond the extent described in this manual will void the warranty.
Maintenance and troubleshooting Welch Allyn MicroTymp3 portable tympanometric instrument 4. Push down on the positive (+) end of the battery. The battery will eject. REF 7291 0 5. Insert the new battery by placing the positive (+) end of the battery against the contact in the holder. Push the battery lightly to compress the contact, and lower the battery into the compartment. Note Insert the battery only as shown.
Directions for use Maintenance and troubleshooting 7. 51 Tighten screw in clockwise direction. To avoid stripping the screw threads, do not tighten excessively. 8. Place the Handle into the charging station for a minimum of 10 seconds to enable the battery protection circuit. Note The unit will not power up if you do not enable the battery protection circuit. Recharge the battery To recharge the battery, place the Handle in the Printer/Charger well with the LCD and buttons facing you.
Maintenance and troubleshooting Welch Allyn MicroTymp3 portable tympanometric instrument Recycle the Battery Check with your local waste management agency for the proper recycling procedure for a Lithium-ion battery. Lithium-ion battery. Must be recycled or disposed of properly. Replace the tips Replace the probe tips after six months of use.
Directions for use Maintenance and troubleshooting 53 2. Depress the FEED button to advance any remaining paper through the printer. Do not pull paper backwards through the printer. Remove and discard old paper roll. Save the black spindle that guides the paper. 3. Pull the paper lever forward. 4. Place the roll of paper behind the Printer/Charger for easier handling. 5. Insert the paper (from of the bottom of the roll) into the slot under the pinch roller, making sure that the paper is centered. 6.
Maintenance and troubleshooting Welch Allyn MicroTymp3 portable tympanometric instrument Cleaning Clean the handle Clean the Handle by wiping it with a cloth that has been lightly dampened with 70% Isopropyl alcohol. Make sure liquid does not seep into the instrument, especially in the probe area. Clean the printer/charger Clean the Printer/Charger by wiping it with a cloth that has been lightly dampened with 70% Isopropyl alcohol.
Directions for use Maintenance and troubleshooting 55 Functional Checks Check the handle A MicroTest Cavity is included with the Handle. The cavity provides a functional test of the Handle to determine if it is working properly. The 0.5 cc cavity is used to test the Low Range of ear canal volume (Vea). The 2.0 cc cavity is used to test the High Range of the ear canal volume (Vea). Check the Handle with the MicroTest Cavity at least once a month and whenever the operation of the Handle is questioned.
Maintenance and troubleshooting Welch Allyn MicroTymp3 portable tympanometric instrument A properly functioning instrument will produce two results: • A flat tympanogram (see the figure below). All data points must fall within the two bottom rows of the graph. • An ear canal volume (Vea) which corresponds to the cavity tested. See the Expected Vea readings table for the acceptable range for each cavity both at sea level and at different altitudes. Tympanogram from 0.
Directions for use Maintenance and troubleshooting 57 Troubleshooting the Handle Symptom Possible Cause Possible Solution Handle does not turn on No battery. Put battery in. Reset the battery protection circuit. Battery is in backwards. Reposition the battery observing correct polarity. Reset the battery protection circuit. Battery is not charged/dead. Charge/replace the battery. Reset the battery protection circuit.
Maintenance and troubleshooting 1. Welch Allyn MicroTymp3 portable tympanometric instrument Test Pattern - The test pattern is used to confirm that the print head is functioning properly. If any of the print head elements are not functioning, a white line will appear vertically down the printout. A defect in the paper may also cause white lines or light printing. Repeat the test pattern to confirm any suspected printing problems.
A Middle ear pathologies Low-admittance pathologies Otitis media with effusion (OME) Otitis media with effusion (OME) is an inflammation of the middle ear accompanied by an accumulation of fluid. Fluid in the middle ear can cause conductive hearing impairment when it interferes with the normal vibration of the eardrum by sound waves. In advanced cases, OME results in flat tympanograms (low Peak Ya). In intermediate stages of OME, the peak height may be normal, but the gradient may be widened.
Middle ear pathologies Welch Allyn MicroTymp3 portable tympanometric instrument vibration with greater ease than the normally stiff tympanic membrane. The result is a high Peak Ya. Although the tympanogram is abnormal, this condition rarely affects hearing sensitivity or requires further medical treatment. Ossicular disruption Disruption of the ossicular chain can range from partial interruption to complete absence of the ossicles.
B Service and warranty information Service Repair Repair must be performed by Welch Allyn authorized personnel. Failure to do so invalidates the warranty. A moderate fee is charged to calibrate the Handle after a repair. Contact Customer Service in your region for service options. Calibration Welch Allyn recommends that the Handle be calibrated annually.
Service and warranty information Welch Allyn MicroTymp3 portable tympanometric instrument Warranty Instrument Welch Allyn Inc. warrants the Handle and Printer/Charger to be free of original defects in material and workmanship and to perform in accordance with manufacturer's specifications for a period of one year from the date of purchase.
C Specifications Physical characteristics 3.68 in 9.35 cm 7.32 in 18.6 cm 2 GR A Ya - mmho 1.0 1 0.5 GR C +200 Vea - cc 1.94 in 4.94 cm POWER CHARGE 0 -400 -200 0 200 FEED PRINT PRESSURE - daPa TEST 4.82 in 12.2 cm 9.70 in 24.6 cm ® MicroTymp 3 Portable Tympanometric Instrument 0297 C US 74227 Patent Pending US Pat #5,383,097 IEC TYPE 3 ANSI TYPE 4 REF Skaneateles Falls, NY USA 23650 9.62 in 24.
Specifications Welch Allyn MicroTymp3 portable tympanometric instrument Technical specifications Probe tone 226-Hz Amplitude: 85 ± 3 dB SPL 1000-Hz Amplitude: 83 ± 3 dB SPL Frequency Accuracy: ± 2% Total Harmonic Distortion: 3% maximum Signal Type: Continuous Sinusoid All specifications measured in an ANSI HA-1 (2.0 cc) coupler.
Directions for use Specifications 65 Display resolution 0.1 mmho for Ya 0.2 cc for +200 Vea Weight Handle: 0.61 lb/0.28 kg Printer/Charger: 3.98 lb/1.81 kg Operating environment Temperature: 15°C to 35°C Relative Humidity: 10% to 90% Barometric Pressure: 700 hPa to 1060 hPa Note No warm-up period is required if the instrument is stored in conditions consistent with the operating environment.
Specifications Welch Allyn MicroTymp3 portable tympanometric instrument Printer paper 4.42 in.
Directions for use Specifications 67 Standards compliance This instrument complies with the following standards based on the most recent revision available at the time of design: UL 60601-1 CAN/CSA C22.2 No. 601.1-M90 EN/IEC 60601-1:1990 EN/IEC 60601-1-2 ANSI S3.39-1987 - ANSI Type 4 instrument IEC 60645-5: 2004 - IEC Type 3 Instrument Handle: Class I Equipment, Type BF Printer/Charger: Class I Equipment, Type B Authorized European representative address: European Regulatory Manager Welch Allyn, Ltd.
Specifications Welch Allyn MicroTymp3 portable tympanometric instrument Guidance and manufacturer’s declaration Emissions and immunity information Caution The MicroTymp3 needs special precautions regarding EMC and needs to be installed and put into service according to the following EMC information provided. Portable and mobile RF communications equipment can affect the MicroTymp3. Electromagnetic Emissions The MicroTymp3 is intended for use in the electromagnetic environment specified below.
Directions for use Specifications 69 Electromagnetic Immunity The MicroTymp3 is intended for use in the electromagnetic environment specified below. The customer or user of the MicroTymp3 should assure that it is used in such an environment. Immunity Test IEC 60601 Test Level Compliance Level Electromagnetic Environment - Guidance Electrostatic discharge (ESD) ± 6 kV contact ± 6 kV contact ± 8 kV air ± 8 kV air Floors should be wood, concrete, or ceramic tile.
Specifications Welch Allyn MicroTymp3 portable tympanometric instrument Electromagnetic Immunity The MicroTymp3 is intended for use in the electromagnetic environment specified below. The customer or user of the MicroTymp3 should assure that it is used in such an environment.
Directions for use Specifications 71 Recommended Separation Distances Between Portable and Mobile RF Communications Equipment and the MicroTymp3 The MicroTymp3 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled.
Specifications Welch Allyn MicroTymp3 portable tympanometric instrument
D Replacement parts and accessories Note Items are not drawn to scale. + REF 72910 Lithium Ion Battery #72910 3.7 V Lithium-ion Screw for Battery Cover #236081 Screw Driver for Battery Cover #236200-2 2.0 cc 0.
Replacement parts and accessories Welch Allyn MicroTymp3 portable tympanometric instrument 1000-Hz Screening Results Cards - Quantity 100: four packs of 25 #55270 Replacement Power Cords (order by plug type) Handle #23650 #761076-2 230 V Europe 2 GR A 1.0 1 0.5 GR C #761076-4 230 V United Kingdom #761076-6 230 V Australia, New Zealand +200 Vea - cc #761076-0 120 V Canada, Japan, U.S.
Glossary acoustic admittance The ease with which acoustic energy is transferred into a system; the ratio of volume velocity to sound pressure. acoustic millimho (mmho) The unit of acoustic admittance; 1 mmho = 10-8m3/Pa*s. cholesteatoma See keratoma. decapascal (daPa) The unit of air pressure used for tympanometric measurements. 1 daPa = 1.02 mm H2O equivalent ear canal volume (+200 Vea) An estimate of the volume of air in front of the probe, measured in cubic centimeters (cc).
Glossary Welch Allyn MicroTymp3 portable tympanometric instrument static admittance (Peak Ya) A calculated measure of the compensated static acoustic admittance (height) of the tympanometric peak in acoustic millimhos (mmho). tympanogram A recording of the admittance of the ear as a function of ear canal pressure. tympanometric gradient A measure of the width of the tympanogram reported in decapascals (daPa) at 50% of static admittance (Peak Ya) or the tympanometric peak.
