Welch Allyn MicroTymp Printer/Charger User manual

Category
Cable network testers
Type
User manual

This manual is also suitable for

MicroTymp
®
3 Handle and
MicroTymp
®
Printer/Charger
Service manual
Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
© 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.
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, precautions, warnings, or statement of intended use published in this
manual.
Welch Allyn and MicroTymp are registered trademarks of Welch Allyn.
XP is trademark of Microsoft.
Software in this product is copyrighted by Welch Allyn or its vendors. All rights are reserved. The software is protected by United
States of America copyright laws and international treaty provisions applicable worldwide. Under such laws, the licensee is entitled
to use the copy of the software incorporated with this instrument as intended in the operation of the product in which it is
embedded. The software may not be copied, decompiled, reverse-engineered, disassembled or otherwise reduced to
human-perceivable form. This is not a sale of the software or any copy of the software; all right, title and ownership of the software
remain with Welch Allyn or its vendors.
For information about any Welch Allyn product, call the nearest Welch Allyn representative:
406695
Material No. 714876 Ver. A
www.welchallyn.com
USA + 1 315 685 4560
800 535 6663
Australia + 61 2 9638 3000
Canada 800 561 8797 China + 86 216 327 9631
European Call Center + 35 3 46 906 7790 France + 33 1 60 09 33 66
Germany + 49 7477 92 71 86 Japan + 81 3 3219 0071
Latin America + 1 305 669 9003 Netherlands + 31 15 750 5000
Singapore + 65 6419 8100 South Africa + 27 11 777 7555
United Kingdom + 44 20 7365 6780 Sweden + 46 8 58 53 65 51
Welch Allyn, Inc.
4341 State Street Road
Skaneateles Falls, NY 13153 -0220 USA
Welch Allyn, Ltd.
Navan Business Park
Dublin Road, Navan
County Meath, Republic of Ireland
REF
iii
Contents
1 - Introduction and technical overview . . . . . . . . . . . . . . . . . . . . . . . . . 1
About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Intended use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About the device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Supporting documents and definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Technical overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Controls, indicators, and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Handle components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Printer/Charger components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General cautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 - Testing and verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Bench test and calibration check - Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Purpose of test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preparation for test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Bench test procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Final Tester Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Testing Performed by the ATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Bench test for the Printer/Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Proper powering up of unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Proper operation of print head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Agency tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Dielectric strength test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Grounding continuity test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Leakage current test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3 - Troubleshooting guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Handle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Printer/Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Noise troubleshooting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Leak troubleshooting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Error and service code tables with troubleshooting procedure . . . . . . . . . . . . . 33
Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Retrieving and clearing error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Service codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4 - Disassembly and reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Handle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
iv Contents Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
Removal/replacement of the LCD and keypad board assemblies . . . . . . . . 42
Removal/replacement of the power PCBA. . . . . . . . . . . . . . . . . . . . . . . . . . 43
Removal/replacement of the MCU PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Replacement of Lithium coin battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Proper placement of ESD shields in the back housing. . . . . . . . . . . . . . . . . 45
Printer/Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Removal/replacement of the top panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Removal/replacement of the main PC board and print head assemblies. . . 47
Removal/replacement of the contact housing and IR flex assemblies. . . . . 48
Removal/replacement of the printer keyboard/LEDs assembly . . . . . . . . . . 49
Removal/replacement of the RFI filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Removal/replacement of old main PC board and print head . . . . . . . . . . . . 50
A - Repair parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B - Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Clean the handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Clean the printer/charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Clean the probe tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
C - Replacement parts and accessories . . . . . . . . . . . . . . . . . . . . . . . . 57
1
1
Introduction and technical overview
About this document
This document is written for technical professionals who are qualified to service medical
instruments. The intended technical environment is any location where service on such
devices is performed. This document describes how to test, calibrate, diagnose,
disassemble, and assemble the MicroTymp3 Handle and MicroTymp Printer/Charger.
Before attempting service on the tympanometer, you must read and understand this
document and all other information that accompanies the tympanometer and its
accessories.
Intended use
This device is an auditory impedance tester intended to detect possible otologic disorders
associated with the functioning of the middle ear.
About the device
Federal US law restricts sale of the device identified in this manual to, or on the order of, a
licensed physician.
Using this device’s 226-Hz and 1000-Hz tympanometry settings, you can quickly and
easily obtain objective results supporting diagnosis of otitis media with effusion and other
middle ear disorders. This information can result in more thorough diagnoses as well as
more effective monitoring, treatment, consultation, and referral.
The 226-Hz test data stored in the memory of the Handle may be printed using the
Printer/Charger. The Printer/Charger reads the information from the Handle and prints out
tympanograms and interpretation.
The switch to change the default frequency is located on the top of the power supply PC
board. The table on the next page gives the function choices of this switch pack.
Note
The Handle also provides the ability to test patients utilizing a 1000-Hz frequency
mode. This mode features a quick interpretation result that displays a Pass, Refer,
or Retest message on the LCD (see Chapter 4 of the DFU, part number 714694).
Results from the quick interpretation mode can be documented using the 1000-
Hz screening results card. Results from the 1000-Hz quick interpretation mode
will not print.
2 Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
The Printer/Charger also charges the rechargeable battery in the Handle.
For more detailed operating instructions, see the DFU for the MicroTymp3 Handle, part
number 714694.
Supporting documents and definitions
Manufacturing Test Specifications for MicroTymp 2.5, DIR number 60029314
DID for MicroTymp 2.5, DIR number 60029426
MicroTymp3 Directions for Use, DIR number 80015401
MicroTymp Hardware Technical Specifications, DIR number 60030837
How2 - MicroTymp 2.5 MPS, DIR number 70020334
Definitions
Switch State Function
Switch 1 off 1000 Hz
Switch 1 on 226 Hz
Switch 2 off Platform communication
Switch 2 on Printer communication
Switches 3 and 4 Not used
ATE Automated Test Equipment
cc Cubic centimeter, a unit of volume
daPa Decapascal, the unit of air pressure used for tympanometric
measurements, 1 daPa = 1.04 mm H
2
0
EEPROM Electrically Erasable Programmable Read-Only Memory
LUT Look Up Table
mbar Unit of atmospheric air pressure measurement
mmho Acoustic millimho, the unit of acoustic admittance
MCU PCA Micro controller Unit Printed Circuit Board Assembly
PS PCA Power Supply Printed Circuit Board Assembly
USB Universal Serial Bus
UUT Unit Under Test
Vea Volume of ear canal
WACP Welch Allyn Communications Protocol
Service manual Introduction and technical overview 3
Technical overview
The Handle hardware contains the necessary circuitry to perform, measure, and report
tympanograms. It is designed to be portable and rechargeable, and to interface with its
corresponding printer device.
In order to perform a tympanogram, the hardware must support a motor/pump assembly
that is capable of a positive and negative pressure in the ear canal. Simultaneously, a
speaker must drive a monotonic 226-Hz, 85 dB sound pressure into the ear. A
microphone amplifier and A/D converter are included to monitor this sound pressure. The
control of the system (tone and pressure), and display of the tympanogram are
implemented with two micro controllers. The hardware and software must provide a
closed-loop system that maintains the 85 dB sound pressure, regardless of the acoustical
admittance in the ear that changes with pressure.
In addition, the Handle shall be capable of performing fully the above function with a
1000-Hz, 83 dB tone.
In order to support the operator interface, the hardware supports an LCD and keypad with
three keys. In order to interface with the Printer/Charger, the Handle has an IR sensor
communication interface. The Handle is designed to start by the press of a button, or by
insertion into the printer/charger unit.
The Handle hardware system is broken down at the top level into three board-level
assemblies:
1) The MCU Board
2) The Power Supply Board
3) The LCD Board
There are other integral components such as the sensors, motor/pump assembly,
switches, USB port, and IR interface which play significant roles in the plotting of the
tympanogram, the powering up of the unit, and the communication of the unit with a
service computer, ATE testing station, or Printer/Charger.
The Power Supply Board can be broken down into these subsystems:
1. The keypad/power up logic is responsible to start the power supply and interrupt the
master MCU whenever a key is depressed. It also reports which key is depressed and
receives an input from the MCU to keep the system powered up.
2. The battery charger provides a constant current charge to the battery whenever the
Handle is in a printer base. When the battery voltage reaches 4.2 volts, the charger
shall cease charging the battery.
3. The battery detection reports a low battery warning to the micro controller.
4. The negative power supply is an inverting switched capacitor power supply used to
support the analog circuitry and the LCD display.
5. The pump motor control provides a selectable voltage to the motor in either forward
or reverse polarity.
6. The pump motor home detect determines whether the pump diaphragm is above or
below the home position.
7. The valve control provides a fixed voltage to the valve in either the open or closed
polarity.
4 Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
The MCU Board can be broken down into these subsystems:
1. The master micro controller is directly responsible for the sound pressure control
loop, operator interface, IR communication, USB communication, and power control.
2. The slave micro controller is directly responsible for the motor control, valve control,
and pressure amplifier.
3. The IR communication is a bidirectional link between the Handle and Printer/Charger
base.
4. The USB port is a bidirectional link between the Handle and either the ATE or the
service computer.
5. The speaker drive provides a 226-Hz sine wave to the speaker. The amplitude is
adjusted by the master MCU to control the sound compliance loop. Digital calibration
is also provided for speaker gain and system cavity size differences. These same
processes also apply to the 1000-Hz function of the Handle.
6. The microphone sends its signal to the A/D converter before filtering. This is true for
both the 226-Hz and 1000-Hz signals.
7. The ADC digitizes the output of the microphone amplifier to be used by the master
MCU in the compliance control loop. Digital calibration of the microphone gain is also
performed.
8. The pressure amplifier scales the signal from the pressure transducer and provides it
to the slave MCU. Digital calibration for transducer gain and offset are provided.
Service manual Introduction and technical overview 5
Controls, indicators, and connectors
Handle components
TEST
-400 -200 0 200
2
0.5
0
1.0
1
GR
A
GR
C
PRESSURE - daPa
Ya - mmho
+200 Vea - cc
MicroTymp
®
3
Portable Tympanometric Instrument
0297
IEC TYPE 3
Skaneateles Falls, NY USA
US Pat #5,383,097
ANSI TYPE 4
Patent Pending
C
US
74227
23650
REF
ON CTS
ON
OFF
123
4
ON CTS
ON
OFF
123
4
72910
REF
+
-
Lithium
Ion
Liquid Crystal
Display (LCD)
Left memory button
Test button
Right memory button
Infrared data
transfer window
Tip
Probe
Tip
ejector
Battery
cover
Micro-USB port
NOTE: Reserved for future use
Lithium-ion
battery
Side view Front view
Bottom view
Interior view
Handle
switches
6 Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
Printer/Charger components
Power Cord
Tip box
POWER
indicator
CHARGE
indicator
FEED button
PRINT button
Paper
slot
Paper access
cover
Charging well for
MicroTymp 2 or 3
Card holder
with 1000-Hz
screening
results cards
IEC power cord
receptacle
Printer/Charger
switches
To IEC power
cord receptacle
To power
receptacle
Service manual Introduction and technical overview 7
Symbols
Documentation symbols
Warning
(Warnings indicate conditions or practices
that could lead to illness, injury, or death.)
Caution
(Cautions indicate conditions or practices
that could damage the equipment or other
property)
Consult instructions for use Hot surface
Operation symbols
POWER indicator FEED button
CHARGE indicator PRINT button
TEST button RIGHT memory button
Gradient width adult LEFT memory button
Gradient width child Switch options ON/OFF symbol
TEST
R
GR
A
L
C
GR
Shipping, storing, and environment symbols
Temperature limits Relative humidity limit
This end up Recycle
Recycle the product separate from other
disposables. See www.welchallyn.com/
weee for collection point and additional
information.
Separate batteries from other disposables
for recycling.
-20ºC
+49ºC
Power and connectivity symbols
Lithium-ion
8 Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
Certification symbols
Meets essential requirements of European
Medical Device Directive 93/42/EEC
74227
Complies with applicable U.S. and
Canadian medical safety standards
Class I equipment, Type BF
(Handle)
European regulatory manager
Class I equipment, Type B
(Printer/Charger)
0297
Miscellaneous symbols
Reorder number Manufacturer
Serial number
REF
SN
Service manual Introduction and technical overview 9
General warnings
General cautions
WARNING Explosion risk. Do not use 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. Use the USB connector only to connect to
devices complying with IEC 60601-1 or other IEC standards as appropriate to the
device. The user is responsible for verifying that the system complies with the
requirements of the system standard IEC 60601-1-1 if additional devices are
connected to the Handle.
WARNING Improper handling or disposal of the battery can lead to heat
generation, smoke, bursting, or fire.
WARNING Do not disassemble, modify, or solder the battery.
WARNING
Do not directly connect (short circuit) the positive (+) and negative (–)
battery terminals.
WARNING To avoid short circuits, keep the battery terminals away from metal
objects.
WARNING Do not dispose of the battery in fire.
WARNING Do not expose the battery to temperatures above 80°C (176°F).
WARNING Use only the specified charger to charge the battery.
Caution Charge only Handle #23640, Handle #23650, or AudioScope 3
(#23300) in the Printer/Charger.
Caution If the device has not been stored within the operating temperature
range, allow 24 hours minimum for it to return to operating temperature range
(15-35°C or 59-95°F) before using.
10 Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
General notes
The Printer/Charger (#7117x) will charge and print data from the MicroTymp2 or
MicroTymp3 Handle. However, the original Printer/Charger (#7113x) will neither charge nor
print data from the MicroTymp3 Handle.
Please complete and return the warranty registration. It validates the warranty and allows
Welch Allyn to communicate calibration notices and software changes.
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.
Caution This instrument contains components which are static sensitive.
Before touching any internal Handle component, be sure that you have
discharged any static electricity by touching a grounded metal object.
Caution To prevent equipment damage, charge the Handle only with the
Printer/Charger (#7117x).
2
11
Testing and verification
Tools
Pressure applicator source with range of -400 to +300 daPa with 1 daPa
resolution
Variable voltage (0-10 VDC) output power supply with at least 500 mA capacity
Test cavity set, part number T20015974. See picture below for sizes.
Handle
Printer/Charger
Digital voltmeter 3 ½ digit
Hemostat or crimping needle nose pliers
Set screw key, size 0.035
Nut driver size 5/32 inch or 4 mm, thin wall preferred
Other nut driver sizes needed: 3/16 inch and 1/4 inch
Small and medium size Philips screwdrivers
ROHS (lead free) soldering iron and lead free solder
•Tweezers
Stop watch for leak test
Service computer (Windows XP
®
, or higher) with 'Sample Client,’ version June
25, 2009. This program will give control of the Handle during the bench test. For
Sample Client to work On-Host Version 1.0.0 or equivalent must be installed prior
to using the WACP Sample Application.
USB cable (thin connector) for connection to service computer
B&K sound level meter model 2250, with ½-inch microphone model 4192 and
2 cc coupler model 4946
1
Barometric Pressure transducer, model 276 or equivalent (must measure
pressure in mmHg)
1
1. These pieces are ATE. They are needed when the calibration is updated but not for the bench test.
Pressure box (T-5657 or equivalent) Test cavity set (T20015974)
12 Testing and verification Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
B&K sound level meter model 2250 1/2-inch microphone model 4192 and
2 cc coupler model 4946
Off-the-shelf tools
Barometer
Service manual Testing and verification 13
Bench test and calibration check - Handle
Purpose of test
To test for and detect problems in the following portions of the Handle:
1. Leak and vent rate
2. Noise (226 and 1000 Hz) and sweep rate test
3. Compliance check
For the purpose of detecting and repairing problems before the unit is run on the ATE.
This will alleviate failures on the final ATE test. Therefore, these tests should be
performed before final testing on the ATE.
Refer to the “Troubleshooting guide starting on page 29 for solutions to the problems
encountered during the bench and ATE tests.
Preparation for test
1. Open the sample client program on the service computer by navigating to the
'Sample Client' folder. Open it and click on the 'Sample App' folder. Double click on
the 'Sample Client' file. Program will open. See opening screen picture.
2. Connect USB cable from Handle to service computer.
Note
Use only the functions of sample client as set forth is this manual.
Note
Any time a new battery is installed it is necessary to connect the MicroTymp
handle to the USB cable or insert it into the printer/charger for five seconds before
powering up the handle. (This enables the battery protection circuit).
Sample client location
14 Testing and verification Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
3. Select the choices as shown in the picture below: 1 for start, 1 for number of
connections, and 2 for USB.
4. An extensive menu should display on the service computer screen. Making sure that
the Handle is powered on, select the number of the 'Disable Power Timeout,'
selection number 20. This will enable the Handle to stay powered up throughout the
test.
Bench test procedures
Test 1 - Leak and vent tests
1. With the main menu still showing on the service computer screen, select number 12,
FmTYMP Test. The FmTYMP Test screen will show. Select number 3, Send
command. Select number 14, Set Valve. Select number 1 to close valve. An audible
click will be heard indicating the valve has been latched closed. Unit can now be
tested for leaks.
2. Connect pressure box to the probe tip of the Handle. Throw select switch on pressure
box to positive position and pressure/vent switch to pressure position.
Opening screen
Sample client menu
Service manual Testing and verification 15
3. Adjust box to 300 daPa, let it sit for about ten seconds, and then observe the leak
rate. It must be less than 10 daPa in five seconds.
4. Vent the unit by throwing the pressure/vent switch on the box to vent position (V).
5. Put select switch in negative position and pressure/vent switch to pressure position.
6. Adjust pressure to -400 (meter will read +400), wait ten seconds, and then observe
leak rate. It must be less than 10 daPa in five seconds.
7. Readjust pressure to -400 daPa.
8. Open valve on Handle by selecting number 2, Open Valve, on the service computer.
Pressure should drop to zero in two seconds or less.
9. To re-enable the timeout circuit, simultaneously press/release all three buttons on
Handle. Unit will power down. Power up unit and confirm that unit powers down in
about fifteen seconds.
Test 2 - Noise and sweep rate tests
1. Set the unit to 226 Hz.
2. Put a 0.2 cc cavity on the probe tip. Hold unit upright and take a reading.
3. There should be a straight line across the bottom. Ideally, there should be no pixels
above the base line. If there are pixels one row above that is acceptable. Any pixels
two rows or more above the base line constitutes a failure. See pictures at the end of
this section.
4. Take four tympanograms and make sure all readings are a pass.
5. In addition, note the sweep across the bottom of the screen during a tympanogram. It
should move at an even speed. Make sure there is no notable slowdown or sudden
start/stops.
6. Repeat steps 2 through 5 for the 2.0 cc cavity.
7. Set the unit to 1000 Hz.
8. Perform cavity tests for 1000 Hz with the 0.2 and 2.0 cc cavities.
Note
The cavity test for 1000 Hz will show the correct volume but not a straight line
across the bottom of the LCD. The line may be slightly elevated but no higher
than 0.4 mmho. It is important that the correct volume is displayed. A REFER
message will also appear on the LCD, and it does not indicate a problem.
1000 Hz Typmanogram
Volume
of
tested
cavity
16 Testing and verification Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
Test 3 - Compliance check for 226 Hz function only
1. Place a 0.5 cc cavity onto the probe tip. Make sure cavity fits properly. The rubber tip
from the cavity should not be pulling away from the white tip ejector. See picture
below.
2. Press the 'TEST' button on the Handle. The unit should take a reading as a flat line
across the bottom of the screen. Press the 'L' button to store the reading into the left
memory. Observe the 'LEFT STORE' message.
3. Insert Handle into Printer/Charger and print out results. The Vea reading should be
0.5 cc +/- 0.1 cc.
4. Repeat steps 1 through 3 with a 1.5 and a 2.4 cc cavity, but press the 'R' button to
store the readings into the right memory. The Vea reading should be the cavity size
+/- 0.1 cc.
Unit is now ready for final test on the ATE.
Good tympanogram (226 Hz) Unacceptable tympanogram (226 Hz)
Note
All units must be tested on the ATE before shipment to the customer.
Properly applied test cavity Printout of test tympanogram
No gap shown
Volume reading
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Welch Allyn MicroTymp Printer/Charger User manual

Category
Cable network testers
Type
User manual
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