WELCH ALLYN AT-2 User manual
Cardio Menu
Service Manual
6-Channel Electrocardiograph
Electrocardiographe à 6 canaux
i
AT-2 User Guide / Mode d'emploi
Article Number 2.510279 b
First edition (a) 1997
Edition (b) August 2001
Welch Allyn Inc.
7420 Carroll Road
San Diego, CA 92121
Phone: (800) 535 6663
Fax: (858) 621-6611
www.welchallyn.com
United Kingdom: Canada:
Welch Allyn UK Ltd Welch Allyn Canada Ltd
Cubblington Road 160 Matheson Blvd. East, Unit #2
Aston Abbotts HP22 4ND Mississauga, Ontario L4Z 1V4
United Kingdom Canada
Tel: 01296-682-140 Tel: (800) 561-8797
Fax: 01296-682-104 Fax: (905) 890-0008
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Terms of Warranty
WELCH ALLYN SCHILLER warrants the AT-2 Electrocardiograph, when new, to be
free of defects in material and workmanship and to perform in accordance with
manufacturer`s specifications for the period of three (3) years from the date of purchase from Welch Allyn or it`s authorized distributors or agents. Accessory items
such as electrodes, batteries and cables are limited to a warranty of 90 days from
the date of purchase from Welch Allyn or its authorized distributors or agents. Welch
Allyn will repair or replace any components found to be defective or at variance from
manufacturer`s specifications within this time at no cost to the customer. It shall be
the purchasers responsibility to return the instrument to Welch Allyn or an authorized distributer, agent or service representative. This warranty does not include breakage or failure due to tampering, misuse, neglect, accidents, modifications or shipping. This warranty is also void if the instrument is not used in accordance with
manufacturer`s recommendations or if repaired by other than Welch Allyn or an
authorized agent. Purchase date determines warranty requirements. No other express warranty is given.
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PHYSICIAN‘S RESPONSIBILITY
The AT-2 electrocardiograph is provided for the exclusive use of qualified physicians
or personnel under their direct supervision. The numerical and graphical results from
a recording must be examined with respect to the patients overall clinical condition.
The recording preparation quality and the general recorded data quality, which could
effect the report data accuracy, must also be taken into account.
It is the physicians responsibility to make the diagnosis or to obtain expert opinion
on the results, and to institute correct treatment if indicated.
Federal law in the USA restricts this device to sale by or on the order of a physician.
ii
Safety Notices
To prevent electric shock do not disassemble the unit. No serviceable parts inside. Refer servicing to
qualified personnel only.
Do not use this unit in areas where there is any danger of explosion or the presence of flammable gases
such as anaesthetic agents.
This product is not designed for sterile use.
This product is not designed for outdoor use.
Switch the unit off before cleaning and disconnect from the mains.
Do not, under any circumstances, immerse the unit or cable assemblies in liquid.
The device must only be operated using battery power if the earth connection is suspect or if the mains
lead is damaged or suspected of being damaged.
Do not use high temperature sterilization processes (such as autoclaving). Do not use E-beam or
gamma radiation sterilization.
Do not use solvent clearners.
Use only accessories and other parts recommended or supplied by Welch Allyn Schiller. Use of other
than recommended or supplied parts may result in injury, inaccurate information and/or damage to the
unit.
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The AT-2 complies with EMC regulations for medical products which affords protection against emissions
and electrical interference. However special care must be exercised when the unit is used with high
frequency equipment.
It must be ensured that neither the patient nor the electrodes (including the neutral electrode) come into
contact with other persons or conducting objects (even if these are earthed).
There is no danger when using the ECG unit for a pacemaker patient or with simultaneous use of other
electrical stimulation equipment. However, the stimulation units should only be used at a sufficient
distance from the electrodes. In case of doubt, the patient should be disconnected from the recorder.
This unit is CF classified according to IEC 601-1. This means that the patient connection is fully
isolated and defibrillation protected. Welch Allyn Schiller can only guarantee protection against
defibrillation voltage however, when the original Welch Allyn Schiller patient cable is used.
If several units are coupled there is a danger of summation of leakage current
Do not touch the casing during defibrillation
If the patient cable should become defective after defibrillation, lead off will be displayed and an
acoustic alarm given
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This equipment has been tested and found to comply with the limits for a class A digital device, pursuant
to both Part 15 of the FCC (Federal Communications Commision) Rules and the radio interference
regulations of the Canadian Department of Communications. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with this instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at his own expense.
Disposal Instructions
and Battery Care
° DO NOT DISPOSE OF THE BA TTERY BY FIRE OR INCINERA TOR -
DANGER OF EXPLOSION
° DO NOT ATTEMPT TO RECHARGE THE BATTERY - DANGER OF
EXPLOSION
° DO NOT OPEN THE BATTERY CASING - DANGER OF ACID BURN
Only dispose of the battery in official recycling centres or municipally
approved areas. Alternatively, used batteries can be returned to Welch
Allyn Schiller for disposal.
Unit Disposal Instructions
Units no longer required can be returned to Welch Allyn Schiller for
disposal. Alternatively dispose of the unit in municipally approved
recycling centres.
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Power Supply
The mains connection is on the rear of the unit.
The power supply voltage is set by the factory for100-115V(nom. 110V) or 220-240V (nom. 230V)
working. The setting is indicated by the indented metal strip on the fuse panel. Contact your
dealer if the voltage needs to be changed.
The mains indicator lamp on the keyboard is always lit when the unit is connected to the mains supply.
The unit can either be operated from the mains supply or from the built-in rechargeable battery. The
power source is indicted on the top line of the LCD.
Changing a Mains Fuse
If it is necessary to change a fuse, always replace with the correct rating i.e 2x200mAT for
230V, or 2x315mAT for 110V .
To change a fuse press the two retaining lugs on side of the fuse panel (situated below the mains
connector on the back panel. Remove the fuse panel and replace the fuse(s). Click back the fuse panel.
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AT-2 User Guide
This User Guide gives instructions on how to operate the unit and provides an overview
of all the basic functions in an easy and simple to use format. The procedures are
presented in a logical, step-by step way to enable the user to quickly and easily
familiarise themselves with unit operation. Detailed medical information is excluded
from this guide except where necessary to operate the unit or understand the results.
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AT-2
User Guide
English Version
Page 1
Table of Contents
Introduction........................................................................................................... 5
Operation Modes .................................................................................................. 6
Automatic Mode .............................................................................................6
Manual Mode.................................................................................................. 7
Location & Power ................................................................................................. 8
Basic Information..................................................................................................9
Indicators ............................................................................................................ 12
General Settings .................................................................................................13
Default Settings ............................................................................................14
Baseline Filter ..............................................................................................18
Mains Filter...................................................................................................19
Myogram Filter..............................................................................................20
Defining Lead Sequence & Printout .............................................................. 21
Acoustic QRS Indication ...............................................................................22
Time / Date...................................................................................................23
Page 2
AT-2
User Guide
Settings for Automatic Mode.............................................................................. 24
Average Cycles ............................................................................................25
Measurements and Markings ........................................................................ 26
Interpretation................................................................................................. 27
Interpretation Settings ................................................................................... 28
Selecting Rhythm Leads ............................................................................... 29
Patient Cable Connections ................................................................................ 30
Recording an ECG in Automatic Mode .............................................................. 33
Recording an ECG in Manual Mode................................................................... 35
Care & Maintenance ........................................................................................... 37
Replacing the Recording Paper.......................................................................... 39
Trouble Shooting................................................................................................ 41
Technical Data..................................................................................................... 42
Available Configurations ............................................................................... 46
AT-2
User Guide
Page 3
Page 4
AT-2
User Guide
Introduction
The AT-2 is a 6-channel ECG recorder. All ECG signals are simultaneously processed to provide instant
ECG recordings. Two automatic recording modes can be individually preset to enable one button ECG
recording of preferred print formats.
Individual lamps are provided to give power, paper error, filter, lead group and lead off indications.
In addition, any detected disturbance (i.e. loose electrode or end of paper), gives an audible alarm and
the corresponding indicator lamp flashes.
The AT-2 includes the following features:
n Low weight and compact dimensions
n Large A4 size printout from integrated quality thermal printer
n Built-in rechargeable battery for mains-independent use
n Simple one key operation
n Automatic or manual recording modes
n Selectable printing formats
n ECG memory for easy copying
n Interpretation program option (including measurements)
AT-2
User Guide
Page 5
Operation Modes
Automatic Mode
Auto Mode Recording
Automatic Mode provides a printout giving
10 seconds of ECG recording of all 12
leads in 2 different formats.
The following can be programmed freely in
each of the formats before recording:
n Lead Format
n Chart Speed
n With the optional interpretation
progam installed is also possible to
select the measurement table, average cycles with optional markings
and interpretation statements for the
printout.
For further information, see paragraph "Settings for Automatic Mode".
Page 6
Connect Patient
Pages 28 to 30
Switch Unit ON
Settings
Pages 11 to 27
Automatic Recording
in Format 1
Pages 31 to 32
12 lead printout
Automatic Recording
in Format 2
Pages 31 to 32
AT-2
User Guide
Operation Modes
Manual Mode
Manual Mode Recording
Manual Mode provides a real time printout
of 6 leads that are selected and indicated
on the keyboard.
The following can be freely selected before
or during recording:
n Lead Group
n Chart Speed
n Sensitivity
n Myogram Filter
For further information see paragraph "ECG
Recording in Manual Mode".
AT-2
User Guide
Connect Patient
Pages 28 to 30
Switch Unit ON
Settings
Pages 11 to 27
Manual Recording
Pages 33 to 34
Leads, Speed,
Sensitivity,
Myogram filter
Pages 18 + 33
Continuous printout of 6 leads
Page 7
Location & Power
Location
Do no keep or operate the apparatus in a we, moist or duty environment. Also, avoid
exposure to direct sunlight or heat from other sources. Do not allow the unit to come
into contact with acidic vapours or liquids, as such contact may cause irreparable
damage. The unit should not be placed near X-ray or diathermy units, large transformers or motors.
The unit must be placed on a flat surface. The unit should not be operated in areas
where there is any danger of explosion.
Power Supply
The unit can either be operated from the built-in rechargeable battery or from the
mains.
The mains connection is on the rear of the unit. The mains indicator lamp is always
lit when the unit is connected to the mains supply.
A battery indicator lamp confirms battery operation. When the battery capacity is
limited, the indicator flashes. To recharge the battery, connect the apparatus to the
mains supply by means of the supplied power cable. A totally discharged battery
needs less than 15 hours to be fully recharged (60% in less than 3 hours, 90% in
less than 7 hours).
A fully charged battery lasts approximately 3-4 hours of normal use. The unit can
remain connected to the mains supply without any danger of damage to either the
battery or the unit.
Page 8
AT-2
User Guide
Basic Information
Switching On and Off
The AT-2 is swiched on by means of the green key and off by means of the red key. .
The unit is switched off after 5 minutes (30 seconds if battery capacity is limited) if no key is pressed
and the patient cable is not disconnected.
Potential Equalization
If the AT-2 is used in conjunction with other patient connected equipment, we recommend that the
potential equalization stud ( ) on the rear of the unit is connected to the hospital/building commond
ground with the yellow/green ground cable (Part. no. 2.310 005).
When working from an emergency vehicle, the vehicle common ground can be used.
AT-2
User Guide
Page 9
Keyboard
Page 10
AT-2
User Guide
Keyboard
Switch unit on
Switch unit off
Copy stored ECG
Start automatic recording
Start manual recording
Stop recording/move paper to start
position
Swith myogram filter (muscle
tremor filter) on or off
Lead group selector (forward)
Lead group selector (backward)
AT-2
User Guide
Cancel or enable QRS beeper
Automatic ECG sensitivity adjustment
from 10 to 5 mm/mV in order to avoid
overlapping traces in automatic mode
only
ECG sensitivity selector (5, 10 or 20 mm/
mV) manual recording only
Chart speed selector (5, 25 or 50 mm/s)
manual recording only
Key for 1mV indication mark on output
druing manual recording. Use this key
also for baseline recentering.
Key for initiation of setups and selection
of second format for printout.
Page 11
Indicators
I II III
II aVF III
LEAD OFF
+ -
Mains indicator (lit when mains connected)
Battery lamp (lit when running on battey power - mains not connected) (blinking
when battery capacity is limited)
Warning lamp for loose electrode connection or poor electrode contact
PAPER
FILTER
(aVR aVL aVF )
V1 V2 V3
V4 V5 V6
V2 V4 V5
V4 V5 V6
V7 V8 V9
Page 12
Warning lamp for end of paper or paper jam
Myogram filter (lit when filter ON)
Indicator lamp for selected lead group (Standard)
(Cabrerea: aVL, l, -aVR, II, aVF, III) in manual mode only
Indicator lamp for selected lead group (Standard) in manual mode only
Indicator lamp for selected lead group in manual mode only
Indicator lamp for selected lead group in manual mode only
AT-2
User Guide
General Settings
Each parameter is set by means of a code. This code comprises a combination starting with the ALT
key followed by a number of keays and is always confirmed with the STOP key. As soon as the ALT key
is pressed, the keyboard is dedicated to the programming function.
The setting is remembered and the keyboard is only released for other functions when the STOP key is
pressed. Once the settings have been confirmed, they are stored in the memory even when the unit is
switched off. As an example, if you wnat to set the language on your AT-2 to English, proceed as follows:
+ + + +
key 0 key 2 key 2
Program sequence
Start programming / CONFIRM SETTING
Switch to numerical keyboard
On the following pages the progammable parameters and the programming sequences are described in
detail.
NOTE THAT THE SETTINGS ARE ALWAYS CONFIRMED BY PRESSING THE KEY. .
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Page 13
General Settings
Default Settings
Settings AT-2 AT-2 with interpretation option
Language English English
Leads Standard (S) Standard (S)
Auto Format 1 ECG: 25mm/s, short (o)
Auto Format 2 ECG: 25mm/s, long (ooo)
Rhythm Leads V1, II
Autom. Centering enabled (+) enabled (+)
Printout of signals sequential sequential
Baseline Filter Settings 0.05Hz 0.05Hz
Mains Filter Settings 50Hz (115V - 60Hz) 50Hz (115V - 60Hz)
Myogram Filter Settings 35Hz, OFF 35Hz, OFF
Interpretations Settings
Page 14
ECG: 25mm/s, short (o)
MECG: 6*2 50mm/s+1(V1)
Measurement: suppressed (-)
Interptretation: enabled (+)
Marks: enabled (+)
ECG: 25mm/s, long (ooo)
MECG: none
Measurement: suppressed (-)
Interpretation: suppressed (-)
Marks: enabled (+)
N/A: suppressed
U: enabled (+)
A30: Under thirty (-)
S: Low (-)
AT-2
User Guide
General Settings
The defined formats and settings can be checked as follows:
Setup Printout
Entry Key Sequence Action
ALT 0 1 1 Printout of programmed settings
A printout of the defined settings will be produced and gives the following information, depending on the
installed software:
Unit designation (AT-2), Software option installed (i = interpretation) and Software version
Serial number
Leads Standard (S) or Cabrera (C)
ECG Format Long (ooo), Short (o) or Suppressed (-)
MECG Average cycles as defined in auto ECG recording setup (e.g. 4*3 (25 mm/s)+2)
Measurements Enabled (+) or Suppressed (-)
Marks Enabled (+) or Suppressed (-)
Interpretation Enabled (+) or Suppressed (-)
Selected Rhythm leads Leads selected for R1, R2 resp.
Automatic Centering Enabled (+) or Suppressed (-)
Printout of Signals Sequential or Simultaneous
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Page 15
General Settings
Baseline Filter 0.05, 0.15 or 0.30 Hz
Mains Filter 50, 60 Hz or OFF (-)
Myogram Filter 25 or 35 Hz, ON (1) or OFF (-)
Interpretation settings N/A: +/- ('normal/abnormal' is written (+) or suppressed (-);
U: +/- ('unconfirmed report' is written (+) or suppressed (-);
A30: +/- (patient age is assumed to be < 30 (-) or > 30 (+);
S: +/- (low (-) or high (+) sensitivity)
To reset the unit to the basic default settings, proceed as follows:
Reset Setup
Entry Key Sequence Action
ALT 0 9 6 Reset to default American base settings
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AT-2
User Guide
General Settings
The language is selected as follows:
Entry Key Sequence Language Confirm
Select Language
1 German
2 English
3 French
ALT 0 2
4 Swedish
5 American
6 Italian
7 Spanish
8 Portuguese
Press
STOP key
Confirm the selection by pressing STOP.
Note: Once selected, the language remains active. However, when the unit is reset to the default settings, the default language will be English.
AT-2
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Page 17
General Settings
There are three different filters which can be set individually as follows:
n Baseline filter
n Mains filter
n Myogram filter
The setting for each filter is given on the setup printout.
Baseline Filter
The digital Baseline filter suppresses excessive baseline drifts. The setting options are as follows:
Baseline Filter
Entry Key Sequence Filter Setting Confirm
0 0.05 Hz (Default)
ALT 5
The set value is the lower limit of the frequency range and is normally set to 0.05 Hz. The settings 0.15
and 0.30 Hz should only be used when absolutely necessary, as the possibility exists that they could
affect the original ECG signal, especially the ST segments.
Confirm the selection by pressing STOP.
1 0.15 Hz
3 0.30 Hz
Page 18
Press
STOP key
AT-2
User Guide
General Settings
Mains Filter
The Mains filter is an adaptive digital interference filter designed to suppress AC interference without
attenuating or distoring the ECG.
Set the mains filter in accordance with the frequency of your local mains supply as follows:
Mains Filter
Entry Key Sequence Filter Setting Confirm
5 50 Hz
AT-2
User Guide
ALT 8
6 60 Hz
9 Filter off
Press
STOP key
Page 19
General Settings
Myogram Filter
The Myogram filter suppresses disturbances caused by strong muscle tremor. The cutoff frequency of
the myogram filter is set to 25 or 35 Hz. The myogram filter is switched on and off manually with the FILT
key. Switching on or off can also be programmed as default when the unit is swiched on. When the filter
is active, the 'FILTER' lamp on the unit is lit.
Myogram Filter
Entry Key Sequence Filter Setting Confirm
2 25 Hz
ALT 8
3 35 Hz
ON when switching on unit
1
(marked on printout with +)
OFF when switching on unit
8
(marked on printout with -)
Press
STOP key
Confirm the selection by pressing STOP.
An ECG recorded in auto mode is stored unfiltered. It is therefore possible to print the stored ECG either
with or without passing the myogram filter.
AT-2
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User Guide
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