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AT-1 User Guide Art. No. 2. 510 270

Settings

Myogram Filter

The

Myogram filter

suppresses disturbances caused by strong muscle tremor. The set value will be the new upper limit

of the frequency range as soon as the

FILT

key is switched on or programmed as default when the unit is switched on.

When the filter is active the

‘FILT’

lamp on the unit is lit. Select the myogram filter settings as follows:

Myogram Filter

Entry Key Sequence

Setting

Confirm

ALT

Myogram Filter 25 Hz

Press
STOP

Key

Myogram Filter 35 Hz

Myo. Filt. ON when switching on unit

(marked on printout with +)

Myo. Filt. OFF when switching on unit

(marked on printout with –)

The myogram filter is switched on and off manually with the

FILT

key

Following an auto mode recording, the ECG is stored unfiltered, it is therefore possible to print the stored ECG either
with or without passing the myogram filter. Filter ON is indicated by the control lamp marked

‘FILTER’

When the

FILT

key is pressed again, the filter is switched off and the indicator lamp goes out. The cutoff frequency of

the myogram filter is set to either 25 or 35 Hz.

Settings

Myogram Filter

The

Myogram filter

suppresses disturbances caused by strong muscle tremor. The set value will be the new upper limit

of the frequency range as soon as the

FILT

key is switched on or programmed as default when the unit is switched on.

When the filter is active the

‘FILT’

lamp on the unit is lit. Select the myogram filter settings as follows:

Myogram Filter

Entry Key Sequence

Setting

Confirm

ALT

Myogram Filter 25 Hz

Press
STOP

Key

Myogram Filter 35 Hz

Myo. Filt. ON when switching on unit

(marked on printout with +)

Myo. Filt. OFF when switching on unit

(marked on printout with –)

The myogram filter is switched on and off manually with the

FILT

key

‘FILTER’

When the

FILT

key is pressed again, the filter is switched off and the indicator lamp goes out. The cutoff frequency of

the myogram filter is set to either 25 or 35 Hz.

Summary of Contents for AT-1

Page 1: ...i i AT 1 3 Channel Electrocardiograph AT 1 3 Channel Electrocardiograph Service Manual Parts List Cardio Menu ...

Page 2: ...296 682 140 Tel 800 561 8797 Fax 01296 682 104 Fax 905 890 0008 Copyright 97 98 by Welch Allyn Schiller AT 1 User Guide Article Number 2 510270b Associated Documents Physician s Guide to the Interpretation and Measurement Program Article Number 2 510 179 Welch Allyn Inc 7420 Carroll Road San Diego CA 92121 Phone 800 854 2904 Fax 619 621 6611 www welchallyn com United Kingdom Canada Welch Allyn UK ...

Page 3: ...ar Switzerland 06 05 1998 JJ Schmid Markus Bütler Research Development Manager Quality Assurance Manager DECLARATION OF CONFORMITY Electrocardiograph AT 1 Serial numbers starting with 190 00100 Year of manufacture 1995 Onwards We the undersigned hereby declare that the medical device class IIa specified above conforms with the essential requirement listed in Annex 1 of EC Directive 93 42 EEC This ...

Page 4: ...r an authorized agent Purchase date determines warranty requirements No other express warranty is given Disclaimer The Information in this guide has been carefully checked for reliability however no guarantee is given as to the correctness of the contents and WELCH ALLYN SCHILLER makes no representations or warranties regarding the contents of this manual We reserve the right to revise this docume...

Page 5: ...NT IF INDICATED FEDERAL LAW IN THE USA RESTRICTS THIS DEVICE TO SALE BY OR ON THE ORDER OF A PHYSICIAN PHYSICIAN S RESPONSIBILITY THE AT 1 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 ...

Page 6: ...SSES SUCH AS AUTOCLAVING DO NOT USE E BEAM OR GAMMA RADIATION STERILISATION DO NOT USE SOLVENT CLEANERS 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 DESI...

Page 7: ...ABLE SHOULD BECOME DEFECTIVE AFTER DEFIBRILLATION LEAD OFF WILL BE DISPLAYED AND AN ACOUSTIC ALARM GIVEN 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 THE AT 1 COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH AFFORDS PROTECTION AGAINST...

Page 8: ...ed to SchillerAG for disposal Alternatively dispose of the unit in municipally approved recycling centres 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 re...

Page 9: ...ains connector on the back panel Remove the fuse panel and replace the fuse s Click back the fuse panel 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 in...

Page 10: ...ation is excluded from this guide except where necessary to operate the unit or understand the results AT 1 User s Guide This User s 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...

Page 11: ...se Press AUTO to record and print Press COPY for additional copies Press OFF to switch unit off AT 1 User Guide Short Form Instructions Manual ECG Recording Rhythm Strip Prepare skin hook up patient Press ON to switch unit on Press MAN START to start printout Change lead group with and Press STOP to stop the printout Electrode hook up check Press key sequence The contact resistance of each electro...

Page 12: ...board 14 Settings 17 Defaults 18 Printout of Current Settings 19 Select Language 20 Baseline Filter 21 Short Form Instructions 1 Introduction 4 AT 1 Operation Modes Automatic 5 AT 1 Operation Modes Manual Mode 5 Patient Cable Connections 6 Standard Leads 7 Recording an ECG in Automatic Mode 8 Recording an ECG in Manual Mode 10 Acoustic QRS Indication 10 Location and Power Supply 12 Location 12 Pow...

Page 13: ... Maintenance 37 Care of your AT 1 37 Self test 37 Maintenance 37 Replacing the Recording Paper 38 Trouble Shooting 39 Technical Data 40 Mains Filter 22 Myogram Filter 23 Lead Sequence standard Cabrera Printout simultaneous sequential Paper Settings 24 Automatic Mode ECG Settings 25 ECG Format 25 Average Cycles 26 Measurements and Markings 27 Rhythm Leads 28 Patient Data Field 30 Measurements 31 He...

Page 14: ...ong as the disturbance remains no ECG can be stored As soon as the defect is eliminated storage starts Introduction The WelchAllyn Schiller AT 1 is a 3 channel ECG recorder with the following features Low weight and compact dimensions Built in rechargeable battery for mains independent use Simple one key operation Automatic or manual recording modes Selectable printing formats with integrated qual...

Page 15: ...r during recording Lead Group Chart Speed Sensitivity Myogram Filter For further information see Paragraph ECG Recording in Manual Mode Introduction AT 1 Operation Modes Automatic 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 Lead Format Chart Speed Measurem...

Page 16: ...ith the colors according to IEC requirements The equivalent AHA colors are given on the table opposite Patient Cable Connections The accessory kit of the electrocardiograph includes a 10 lead patient cable This cable is plugged into the patient cable socket on the right hand side of the unit and secured with the two screws The AT 1 is CF rated The patient connection is fully isolated and defibrill...

Page 17: ...hite Brown V4 Brown Blue C5 White Black V5 Brown Orange C6 White Violet V6 Brown Violet L Yellow LA Black F Green LL Red Standard Leads Patient Cable Connections IEC AHA N Black RL Green R Red RA White C1 White Red V1 Brown Red C2 White Yellow V2 Brown Yellow C3 White Green V3 Brown Green C4 White Brown V4 Brown Blue C5 White Black V5 Brown Orange C6 White Violet V6 Brown Violet L Yellow LA Black ...

Page 18: ...CG recording in Format 1 press To start the automatic recording in the second format press followed by Recording an ECG in Automatic Mode In automatic mode a full 12 lead ECG is printed in one of two predefined formats with a sensitivity of 10 mm mV These two formats are selected by the user to suit his specific needs and requirements see ECG settings Pressing before recording in automatic mode th...

Page 19: ...e To obtain an extra printout of the ECG recording in Format 1 press To obtain an extra printout of the second format press followed by Recording an ECG in Automatic Mode The printout provides the following information ECG recording of all leads in either Standard or Cabrera format according to selection Sensitivity Heart Rate Speed and if set Data field to manually insert data Average Cycles Inte...

Page 20: ...dication The acoustic QRS indication can be switched on or off at any time by pressing the QRS BEEP key Recording an ECG in Manual Mode Manual mode provides a direct printout of the real time ECG with full control of parameter selection The following can be freely chosen during or before the recording Lead Group with and The following lead groups are selectable Additionally lead V1 II and V5 can b...

Page 21: ...on are given At the top the heart rate as current average of 4 beats is shown To re centre the ECG traces press the key during operation Recording an ECG in Manual Mode To start the manual printout press Stop the manual printout by pressing The printout provides you with the following information The group of the three selected leads with lead identification On the lower edge chart speed sensitivi...

Page 22: ...can remain connected to the mains supply without any danger of damage to either the battery or the unit Location and Power Supply Location Do not keep or operate the apparatus in a wet moist or dusty 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...

Page 23: ...ion stud on the rear of the unit is connected to the practice building common ground with the yellow green ground cable Part no 2 310005 Switching the Unit On and Off Switching On and Off The AT 1 is switched on by means of the green ON key and off by means of the red OFF key The unit is automatically switched off after 5 minutes 30 seconds if battery capacity is limited if no key is pressed and t...

Page 24: ...14 14 Keyboard Keyboard ...

Page 25: ...ters the trace during a manual printout Set second key function key for initiation of setups and selection of second format for printout Keyboard Switch unit on Switch unit off Copy stored ECG Start automatic recording Start manual recording Stop recording Switch myogram filter muscle tremor filter on or off Lead group selector forward Lead group selector backward Cancel or enable QRS beeper Autom...

Page 26: ...VR II aVF III V1 V2 V3 V4 V5 V6 Note The lead group indicators are applicable for manual recording only Keyboard Mains indicator lit when mains connected Battery lamp lit when running on battery power mains not connected blinking when battery capacity is limited Warning lamp for end of paper or paper jam Warning lamp for loose electrode connection or poor electrode contact Myogram filter lit when ...

Page 27: ...y 0 key 2 key 5 CONFIRM SETTING On the following pages the programmable parameters and the programming sequences are described in detail 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 keys and is always confirmed with the STOP key As soon as the ALT key is pressed the keyboard is dedicated to the programming fun...

Page 28: ... Setting 35 Hz OFF To reset the unit to the default settings press the following key sequence ALT 0 6 6 Settings Defaults The default settings are as follows Language English Leads Standard s Format 1 ECG 25mm s Short o three pages MECG 2 6 50mm s 1 Rhythm Measurements Suppressed Marks Enabled Format 2 ECG 25mm s long ooo six pages MECG suppressed Measurements Suppressed Marks Enabled Rhythm Leads...

Page 29: ... 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 Settings Printout of Current Settings Obtain a printout of the formats and settings programmed by pressing the following key sequence A printout of the defined settings will be produced and gives the following information depending on the installed software Unit ...

Page 30: ...rican 6 Italian 7 Spanish 8 Portuguese 9 Dutch 0 Russian Confirm the selection by pressing the STOP key General Settings Select Language Any of the following languages can be set for the printout Press the following key sequence ALT 0 2 then key 1 for German 2 English 3 French 4 Swedish 5 American 6 Italian 7 Spanish 8 Portuguese 9 Dutch 0 Russian Confirm the selection by pressing the STOP key ...

Page 31: ...ly be used when absolutely necessary as the possibility exists that they could affect the original ECG signal especially the ST segments General Settings There are three different filters which can be set individually as follows Baseline filter Mains filter Myogram filter The setting for each filter is given on the setup printout see Section Maintenance for details Baseline Filter The digital Base...

Page 32: ...ilter Setting Confirm ALT 8 5 Mains Filter 50 Hz Press STOP Key 6 Mains Filter 60 Hz 9 Mains Filter off Settings Mains Filter The Mains filter is an adaptive digital interference filter designed to suppress AC interference without attenuating or distorting the ECG Select the mains frequency as follows Mains Filter Entry Key Sequence Filter Setting Confirm ALT 8 5 Mains Filter 50 Hz Press STOP Key ...

Page 33: ...again the filter is switched off and the indicator lamp goes out The cutoff frequency of the myogram filter is set to either 25 or 35 Hz Settings Myogram Filter The Myogram filter suppresses disturbances caused by strong muscle tremor The set value will be the new upper limit of the frequency range as soon as the FILT key is switched on or programmed as default when the unit is switched on When th...

Page 34: ...mm wide with black marks Roll Paper roll 90 mm wide without black marks only offered in certain markets Settings Lead Sequence standard Cabrera Printout simultaneous sequential Paper Settings The required settings can be selected as follows Sequences Print Paper Entry Key Sequence Definition Confirm ALT 7 1 Standard Lead Sequence Press STOP Key 2 Cabrera Lead Sequence 3 Simultaneous Print 4 Sequen...

Page 35: ...y 6 Leads are printed in short form 3 sheets 7 Leads are printed in long form 6 sheets 8 Chart speed is 25 mm s 9 Chart speed is 50 mm s Automatic Mode ECG Settings Two separate ECG auto mode formats can be defined To define auto mode format 1 the key sequence commences with ALT followed by key 1 To define auto mode format 2 the key sequence commences with ALT followed by key 2 The following pages...

Page 36: ...t a chart speed of 25 mm s Note Lead selection for the 2 rhythm leads are defined on the following page Settings for Automatic Mode Average Cycles TheAverage cycles are defined as follows Average Cycles Measurement Option only Entry Key Sequence Output Format Confirm ALT 1 or 2 2 5 No average cycles are printed Press STOP Key 6 4 3 25 mm s The average complexes are printed out in four groups of th...

Page 37: ...l as end of T wave are omitted 8 Reference markings beginning and end of P wave and QRS as well as end of T wave are added to ECG cycles Settings for Automatic Mode Measurements and Markings To define the measurements and markings proceed as follows Measurements and Markings Measurement Option only Entry Key Sequence Output Format Confirm ALT 1 or 2 3 5 Detailed table of measurement results is omi...

Page 38: ...T 4 8 then key 1 for lead I 2 II 3 III 4 aVR 5 aVL 6 aVF Confirm the selection by pressing the STOP key Settings for Automatic Mode Rhythm Leads The rhythm leads are printed out in the last two average cycle selections see previous page Two separate rhythm leads can be selected The following leads can be set Extremity Leads Rhythm Lead 1 R1 press ALT 3 8 Rhythm Lead 2 R2 press ALT 4 8 then key 1 f...

Page 39: ...ss ALT 3 9 Rhythm Lead 2 R2 press ALT 4 9 then key 1 for lead V1 2 V2 3 V3 4 V4 5 V5 6 V6 Confirm the selection by pressing the STOP key Settings for Automatic Mode Extremity Leads Rhythm Lead 1 R1 press ALT 3 9 Rhythm Lead 2 R2 press ALT 4 9 then key 1 for lead V1 2 V2 3 V3 4 V4 5 V5 6 V6 Confirm the selection by pressing the STOP key ...

Page 40: ... Patient data field omitted 6 Patient data field printed Confirm the selection by pressing the STOP key Settings for Automatic Mode Patient Data Field A patient data field can be included on the auto mode printout for manual insertion of name and age etc Auto Format 1 ALT 1 4 Auto Format 2 ALT 2 4 then key 5 Patient data field omitted 6 Patient data field printed Confirm the selection by pressing ...

Page 41: ...ould show at a heart rate of 60 min Usually the QTC amounts to 390 40 ms The conversion is according to Bazetts formula QTC QT x 1000 RR Measurements Note This section gives the measurements that are calculated by the AT 1 software Heart Rate HR Average heart rate HR calculated on the basis of the entire 10 second recording and shown as number of beats per minute Intervals Parameter Description RR...

Page 42: ...al vector in the frontal plane I aVF 40o 1 82 lead I Q R S R S aVF I 1 51 lead aVF Q R S R S 90 180 o o Measurements Electrical Axis The electrical axes of the heart are determined separately for the P QRS and T waves They indicate the main spreading direction of the electrical vector in the frontal plane I aVF 40o 1 82 lead I Q R S R S aVF I 1 51 lead aVF Q R S R S 90 180 o o ...

Page 43: ...e axes on the basis of the maximum deflection of the relevant waves in leads I and aVF The following formula is used for the calculation Measurements Vector of lead I Q R S and R S 0 24Q 2 6R 0 55S 0 02R 0 01S I II Vector of lead aVF Q R S and R S 0 25Q 2 41R 0 66S 0 02R 0 01S aVF The SCHILLER measurement program calculates the axes on the basis of the maximum deflection of the relevant waves in l...

Page 44: ...eathing and the position of the patient recumbent standing can result in changes in the electrical axes Measurements Note Large discrepancies may be found between two measurements with faint P and T waves Also breathing and the position of the patient recumbent standing can result in changes in the electrical axes ...

Page 45: ... the distance between the J point and max T wave mV T amplitude of the T wave mV T amplitude of the T wave in case of biphasic T wave mV Measurements The Schiller measurement program provides a table with lead specific measurement results In 12 columns i e one for each lead the amplitude values of P Q R S T and R S T waves the J point and the ST integral are listed in millivolts The amplitude meas...

Page 46: ...36 36 Measurements P Qd Q Rd Sd R ST J POINT S T R S R d S d intrinsicoid deflection point Measurements P Qd Q Rd Sd R ST J POINT S T R S R d S d intrinsicoid deflection point ...

Page 47: ...according to IEC 601 1 and IEC 601 2 25 Clause 19 Functional tests according to the Service Handbook The test results must be documented Care Maintenance Care of your AT 1 The cable should not be exposed to excessive mechanical stress Whenever disconnecting the leads hold the plugs and not the cables Store the leads in such a way as to prevent anyone stumbling over them or any damage caused by the...

Page 48: ...ler Close lid and press firmly until release catches Press to transport the paper to the start position Replacing the Recording Paper NOTE Welch Allyn can only guarantee an excellent printout if Welch Allyn original chart paper or a chart paper of the same quality is used The recording paper must be replaced as soon as the end of the paper is indicated by a red stripe on the lower edge After the i...

Page 49: ...electrode contact Activate baseline filter No printout Check if paper compartment is closed tight Check paper level Check paper settings Trouble Shooting Problem What to Check Unit does not switch On Mains Indicator Lamp is not lit Check if mains cable is plugged in Call your local SCHILLER dealer if problem is still present Noisy traces CHECK ELECTRODE CONTACT As much as possible ensure that pati...

Page 50: ...lts intervals amplitudes electrical axes average complexes with optional measurement reference markings Technical Data Technical data subject to change without notice Dimensions l w h 290 x 210 x 69 mm Weight 2 9 kg Mains Supply 100 to 115 220 to 240 VAC 50 60 Hz Battery Built in 12 V lead acid battery rechargeable Power Consumption Recording 28VAmax Leads Standard Cabrera Paper Speed 5 25 50 mm s...

Page 51: ...s by means of an adaptive digital filter Patient Input Fully floating and isolated defibrillation protected Patient Leakage Current 5 µA Technical Data ECG Storage Circular input memory for 10 s 12 lead ECG Frequency Range of Digital Recorder 0 to 150 Hz IEC 0 to 150 Hz AHA ECGAmplifier Simultaneous synchronous registration of all 9 active electrode signals 12 standard leads Sampling frequency 100...

Page 52: ...elative humidity 25 to 95 non condensing Atmospheric pressure 700 to 1060 hPa Control Panel Rubber keys Technical Data Safety Standard CF according to IEC and complying with the following RL 93 42 EEC EN 60601 1 1990 IEC 601 1 IEC 601 2 25 1993 pr EN 1441 1994 EMC CISPR 11 1985 EN 55011 1992 IEC 801 2 1991 IEC 801 3 1984 IEC 801 4 1988 IEC 801 5 Safety Class I according to IEC 601 1 with internal ...

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