Welch Allyn AT-1 Manual
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Welch Allyn AT-1 Manual

Welch Allyn AT-1 Manual

3-channel electrocardiograph
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3-Channel Electrocardiograph
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  • Page 1 Cardio Menu Service Manual Parts List AT-1 3-Channel Electrocardiograph...
  • Page 2 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 Copyright © `97 & `98 by Welch Allyn Schiller...
  • Page 3 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.
  • Page 4 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.
  • Page 5 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 PREPARATION QUALITY AND THE GENERAL RECORDED DATA QUALITY, WHICH COULD EFFECT THE REPORT DATA ACCURACY, MUST ALSO BE TAKEN INTO ACCOUNT.
  • Page 6 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.
  • Page 7 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 EMISSIONS AND ELECTRICAL INTERFERENCE.
  • Page 8 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.
  • Page 9 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.
  • Page 10 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 unit operation.

  • Page 11: Short Form Instructions

    (right column) are between ±50mV. • Filter On/Off Press OFF to switch unit off. • Press to switch the (Myogram) filter On / Off. Print System Configuration • Press key sequence AT-1 User Guide Art. No. 2. 510 270...

  • Page 12: Table Of Contents

    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 ......
  • Page 13 Electrical Axis ..............32 Care & Maintenance ............. 37 Care of your AT-1 .............. 37 Self-test ................37 Maintenance ............... 37 Replacing the Recording Paper ........38 Trouble Shooting ............39 Technical Data .............. 40 AT-1 User Guide Art. No. 2. 510 270...

  • Page 14: Introduction

    Introduction The Welch Allyn 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. °...

  • Page 15: At-1 - Operation Modes - Automatic

    Manual Mode provides a real time printout of 3 leads that are selected and indicated on the keyboard. The following can be freely selected before or during recording: ° Lead Group ° Chart Speed ° Sensitivity ° Myogram Filter For further information see Paragraph “ECG Recording in Manual Mode”. AT-1 User Guide Art. No. 2. 510 270...

  • Page 16: Patient Cable Connections

    Thoroughly clean the area with alcohol. screws. Place the C4 electrode first - in the fifth The AT-1 is CF rated. The patient connection is fully isolated and defibrillation protected. intercostal space on midclavicular line. Protection against defibrillation voltage is...

  • Page 17: Standard Leads

    Patient Cable Connections Standard Leads Black Green White White/Red Brown/Red White/Yellow Brown/Yellow White/Green Brown/Green White/Brown Brown/Blue White/Black Brown/Orange White/Violet Brown/Violet Yellow Black Green AT-1 User Guide Art. No. 2. 510 270...

  • Page 18: Recording An Ecg In Automatic Mode

    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, the program detects very large waveform amplitudes and sets the sensitivity for the extremity and/or precordial leads to 5 mm/mV to reduce the overlapping of traces.
  • Page 19 Intervals ° Axis ° Detailed Measurement Table 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 AT-1 User Guide Art. No. 2. 510 270...

  • Page 20: Recording An Ecg In Manual Mode

    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: Set Chart Speed Lead Group with The following lead groups are selectable: Set Sensitivity Acoustic QRS Indication The acoustic QRS indication can be switched on or off at any time...
  • Page 21 (if on) are given. ° At the top, the heart rate as current average of 4 beats is shown. Stop the manual printout by pressing To re-centre the ECG traces, press the during operation. AT-1 User Guide Art. No. 2. 510 270...

  • Page 22: Location And Power Supply

    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.

  • Page 23: Switching The Unit On And Off

    Potential Equalisation If the AT-1 is used in conjunction with other (electrical) equipment connected to the patient, we recommend that the potential equalisation stud on the rear of the unit is connected to the practice / building common ground with the yellow/ green ground cable (Part-no.

  • Page 24: Keyboard

    Keyboard...
  • Page 25 Also recenters the trace during a manual printout. Lead group selector (forward). Set second key function - key for initiation of setups and selection of second format for Lead group selector (backward). printout. AT-1 User Guide Art. No. 2. 510 270...
  • Page 26 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 filter ON).

  • Page 27: Settings

    With reference to the language table on page 20, press the following key sequence: Start Programming Program sequence (key `0`) (key `2`) (key `5`) CONFIRM SETTING On the following pages the programmable parameters and the programming sequences are described in detail. AT-1 User Guide Art. No. 2. 510 270...

  • Page 28: Defaults

    Settings Defaults To reset the unit to the default settings, press the following key sequence. The default settings are as follows: Language English Leads Standard (s) Format 1 ECG: 25mm/s, Short (o) three pages `ALT` MECG: 2*6 (50mm/s) + 1 Rhythm Measurements: Suppressed (-) Marks: Enabled (+)

  • Page 29: Printout Of Current Settings

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

  • Page 30: Select Language

    General Settings Select Language Any of the following languages can be set for the printout. Press the following key sequence: `ALT` `0` then German English French Swedish American Italian Spanish Portuguese Dutch Russian Confirm the selection by pressing the STOP key...

  • Page 31: Baseline Filter

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

  • Page 32: Mains Filter

    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 Mains Filter 50 Hz Press Mains Filter 60 Hz STOP...

  • Page 33: Myogram 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. AT-1 User Guide Art. No. 2. 510 270...

  • Page 34: Lead Sequence (Standard/Cabrera), Printout (Simultaneous/Sequential) & Paper Settings

    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 Standard Lead Sequence Cabrera Lead Sequence Simultaneous Print Press Sequential Print STOP Auto-Centering ON Auto-Centering OFF Z-Fold Paper Paper Roll...

  • Page 35: Automatic Mode (Ecg) Settings

    No leads are printed Leads are printed in short form (3 sheets) Press STOP Leads are printed in long form (6 sheets) Chart speed is 25 mm/s Chart speed is 50 mm/s AT-1 User Guide Art. No. 2. 510 270...

  • Page 36: Average Cycles

    Settings for Automatic Mode Average Cycles The Average cycles are defined as follows: Average Cycles (Measurement Option only) Entry Key Sequence Output Format Confirm No average cycles are printed. 4 * 3 (25 mm/s) The average complexes are printed out in four groups of three leads at a chart speed of 25 mm/s.

  • Page 37: Measurements And Markings

    QRS as well as end of T wave) are omitted. Reference markings (beginning and end of P wave and QRS as well as end of T wave) are added to ECG cycles. AT-1 User Guide Art. No. 2. 510 270...

  • Page 38: Rhythm Leads

    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` Rhythm Lead 2 (R2) press: `ALT` `4`...
  • Page 39 Settings for Automatic Mode Extremity Leads Rhythm Lead 1 (R1) press: `ALT` `3` Rhythm Lead 2 (R2) press: `ALT` `4` then for lead Confirm the selection by pressing the STOP key AT-1 User Guide Art. No. 2. 510 270...

  • Page 40: Patient Data Field

    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` Auto Format 2 `ALT` `2` then Patient data field omitted. Patient data field printed.

  • Page 41: Measurements

    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...

  • Page 42: Electrical Axis

    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. 1.82 (lead I Q+R+S+R`+S`) -180 1.51 (lead aVF Q+R+S+R`+S`)
  • Page 43 = (-0.25Q) + 2.41R + (-0.66S) + 0.02R' + (-0.01S') The SCHILLER measurement program calculates the 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: AT-1 User Guide Art. No. 2. 510 270...
  • Page 44 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 ( from the J point to half the distance between the J-point and max. T wave) amplitude of the T wave amplitude of the T' wave (in case of biphasic T wave) AT-1 User Guide Art. No. 2. 510 270...
  • Page 46 Measurements intrinsicoid deflection point J- POINT...

  • Page 47: Care & Maintenance

    Care of your AT-1 Self-test The cable should not be exposed to excessive To Initiate a self-test of the AT-1 press the following key sequence: mechanical stress. Whenever disconnecting the leads, hold the plugs and not the cables. Store the leads in...

  • Page 48: Replacing The Recording Paper

    Replacing the Recording Paper • Push paper compartment release and lift up NOTE: Welch Allyn can only guarantee an excellent cover. printout if Welch Allyn original chart paper or a chart paper of the same quality is used. • Remove the remaining paper.

  • Page 49: Trouble Shooting

    ECG trace "wanders" away from Baseline drift - check electrode contact. Activate baseline filter. centre Check if paper compartment is closed tight. Check paper level. No printout Check paper settings. AT-1 User Guide Art. No. 2. 510 270...

  • Page 50: Technical Data

    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: 28 VA max.
  • Page 51 Line Frequency Filter: Distortion-free suppression of superimposed 50 or 60 Hz sinusoidal interferences by means of an adaptive digital filter. Patient Input: Fully floating and isolated, defibrillation protected Patient Leakage Current: <5 µA AT-1 User Guide Art. No. 2. 510 270...
  • Page 52 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 power supply)

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