Schiller AT-2plus Service Handbook Issue d May 2002

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

AT-2plus Memory Service Handbook Article Number 2. 540014d

Issue 1 : June 1998 Issue 2 : December 1999

Schematics: 2480BC, 2482CA, 2483BF, 2485BA

Issue c : September 2001

Schematics: 2480BC, 2482CA, 2483DA, 2485BA

Issue d : May 2002

Schematics: 2480BC, 2482CA, 2483DA, 2485BA

Associated Documents Guide to the SCHILLER Interpretation and Measurement Program E/ D/ F

Article No.

2. 510179

SCHILLER AT-2plus User Guide - English / German / French

Article No.

2. 510220

SCHILLER AT-2plus User Guide - Italian / Spanish / Portuguese

Article No.

2. 510221

SCHILLER AT-2plus User Guide - Swedish

Article No.

2.510321

SCHILLER AT-2plus Short Form User Guide - Swedish

Article No.

2.510245

© SCHILLER AG 2001 Windows™ is a trademark of Microsoft Corporation. ii

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Where to Obtain Service

WELCH ALLYN SCHILLER Inc., 7420 Carroll Road, San Diego, CA , US-92121-2334 USA USA / Canada

Tel.: +1 858 635 6023

Fax : +1 858 635 6611

Home Page : www.welchallyn.com

Asia Pacific

SCHILLER Asia Pacific, 10 Jalan SS 3/33, Taman Universiti, 47300 Petaling Jaya, Selangor, Malaysia Tel.: + 603 7877 5336

Fax : + 603 7877 5744

SCHILLER HmbH, Kampmüllerweg 24, A-4044 Linz, Austria Austria Tel.: + 43 732 709 90

France

Fax : + 43 732 757 000

SCHILLER Medical S.A, BP 50, 19, Avenue de la Gare, F-67162 Wissembourg / Cedex, France Tel.: +33 3 88 63 36 00

Germany (EU authorized representative)

India

Fax : +33 3 88 94 12 82

SCHILLER Medizintechnik GmbH, Rudolf-Diesel Strasse 14, D-85521 Ottobrunn, Germany Tel.: + 4989 629 981 0

Fax : + 4989 609 509 0

SCHILLER Healthcare India Pvt. Ltd.,D.C.Silk Mills Compound, 'A' Wing, 1st floor, 5, Chunawala Estate, Kondivitta Lane, Andheri - Kurla Road, Andheri (E, Mumbai - 400 059, India Tel.: + 9122 826 3520

Fax : + 9122 826 3525

ESAOTE Spa (SCHILLER), Via di Caciolle 15, I-50127 Firenze, Italy Italy Tel.: + 39055 4229 201

Fax : + 39055 4229 208

SCHILLER Reomed AG, Riedstrasse 14, CH-8953 Dietikon, Switzerland Switzerland Tel.: +411 744 3000

Fax : + 411 740 3710

SCHILLER AG, Altgasse 68, CH-6341 Baar, Switzerland All other countries

Tel.: + 4141 766 4242

Fax : + 4141 761 0880

Home Page : www.schiller.ch

iii

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Warranty

Terms of Warranty The SCHILLER AT-2plus Memory is warranted against defects in material and manufacture for the duration of one year (as from date of purchase). Excluded from this guarantee is damage caused by an accident or as a result of improper handling. The warranty entitles free replacement of the defective part. Any liability for subsequent damage is excluded. The warranty is void if unauthorized or unqualified persons attempt to make repairs. In case of a defect, contact your dealer or the manufacturer. The manufacturer can only be held responsible for the safety, reliability, and performance of the apparatus if: * assembly operations, extensions, readjustments, modifications, or repairs are carried out by persons authorized by him, and * the AT-2plus Memory and approved attached equipment are used in accordance with the manufacturers instructions. THERE ARE NO EXPRESS OR IMPLIED WARRANTIES WHICH EXTEND BEYOND THE WARRANTIES HEREINABOVE SET FORTH. SCHILLER MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE PRODUCT OR PARTS THEREOF.

iv

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Safety Notices

WARNINGS & CAUTIONS 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. IF THE DISPLAY IS DAMAGED, A LEAKAGE OF FLUID MAY OCCUR. DO NOT INHALE THE VAPOUR FROM THIS FLUID AND AVOID CONTACT WITH MOUTH AND SKIN. IF CONTACT IS MADE, CLEAN CONTAMINATED AREA IMMEDIATELY WITH FRESH WATER. THIS PRODUCT IS NOT DESIGNED FOR STERILE 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. DO NOT OPERATE THE UNIT IF THE EARTH CONNECTION IS SUSPECT OR IF THE MAINS LEAD IS DAMAGED OR SUSPECTED OF BEING DAMAGED. DO NOT USE HIGH TEMPERATURE STERILISATION PROCESSES (SUCH AS AUTOCLAVING). DO NOT USE E-BEAM OR GAMMA RADIATION STERILISATION. DO NOT USE SOLVENT CLEANERS USE ONLY ACCESSORIES AND OTHER PARTS RECOMMENDED OR SUPPLIED BY SCHILLER AG. USE OF OTHER THAN RECOMMENDED OR SUPPLIED PARTS MAY RESULT IN INJURY INACCURATE INFORMATION AND/ OR DAMAGE TO THE UNIT. THIS UNIT COMPLIES WITH EMC REGULATIONS FOR MEDICAL PRODUCTS WHICH AFFORDS PROTECTION AGAINST EMISSIONS AND ELECTRICAL INTERFERENCE. HOWEVER SPECIAL CARE MUST BE EXERCISED WHEN THIS 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.

v

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Safety Notices

WARNINGS & CAUTIONS THIS UNIT IS CF CLASSIFIED ACCORDING TO IEC 601-1. THIS MEANS THAT THE PATIENT CONNECTION IS FULLY ISOLATED AND DEFIBRILLATION PROTECTED. SCHILLER CAN ONLY GUARANTEE PROTECTION AGAINST DEFIBRILLATION VOLTAGE, HOWEVER, WHEN THE ORIGINAL SCHILLER PATIENT CABLE IS USED. WHEN NON-MEDICAL DEVICES ARE CONNECTED TO THE RS-232 INTERFACE ENSURE THAT BOTH UNITS ARE SECURELY CONNECTED TO THE SAME EARTH POTENTIAL. WHEN OPERATING THE UNIT ON BATTERY AND SIMULTANEOUSLY USING NONMEDICAL DEVICES, THE RS-232 INTERFACE MUST BE FULLY ISOLATED. AN EXTERNAL DEVICE MUST ONLY BE CONNECTED USING THE ORIGINAL SCHILLER INTERFACE CABLE ASSEMBLY. BEFORE USING THE UNIT, ENSURE THAT AN INTRODUCTION REGARDING THE UNIT FUNCTIONS AND THE SAFETY PRECAUTIONS HAS BEEN PROVIDED BY A SCHILLER REPRESENTATIVE. THE GUIDELINES FOR PATIENT ELECTRODE PLACEMENT ARE PROVIDED AS ON OVERVIEW ONLY. THEY ARE NOT A SUBSTITUTE FOR MEDICAL EXPERTISE. THIS UNIT IS PROVIDED FOR THE EXCLUSIVE USE OF QUALIFIED PHYSICIANS OR PERSONNEL UNDER THEIR DIRECT SUPERVISION. THE NUMERICAL AND GRAPHICAL RESULTS AND ANY INTERPRETATION DERIVED 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.

vi

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

What's in this book The service philosophy for the AT-2plus Memory is fault finding to module level. The purpose of this book is to provide all the information necessary to enable the service engineer to efficiently locate and replace a faulty module. This book assumes no detailed knowledge of the AT-2plus Memory but does require that the service engineer is familiar with standard workshop practices. The book is divided into the following chapters:

Chapter 1 - Operating Elements The purpose of this chapter is to provide an easy reference for all the main operator functions and to give a basic introduction to the AT-2plus Memory. This chapter gives details of the operator controls with the operation and function of each key briefly explained. The information in this chapter provides a background to the operating functions only. Complete operating information is provided in the SCHILLER AT-2plus User Guide.

Chapter 2 - Functional Overview This chapter provides a functional overview of the AT-2plus Memory. The description is supported by functional block diagrams.

Chapter 3 - Fault Diagnosis This chapter provides a guide to locate a fault to module level. The diagnostics are presented in a logical sequence of fault finding algorithms and procedures. Illustrations are provided to support the text where needed.

Chapter 4 - Module Removal and Replacement This chapter gives an overview of the physical construction of the AT-2plus Memory with the main physical attributes of the unit briefly described. The physical description is supported by illustrations showing the internal location of all modules. Removal and replacement instructions for all removable modules are also provided in this chapter. Each procedure is autonomous with details of tools, jumper settings, adjustments and settings or special requirements that are required before and after replacement. Functional checks that must be carried out after replacing a module are also provided.

Chapter 5 - Adjustments This chapter provides all adjustments and settings. Also detailed in this chapter are basic functional test procedures that can be performed to check the functioning of the unit.

Chapter 6 - Spare Parts This chapter provides the part numbers and reordering information for all replaceable modules. Also included in this chapter are details of any special test equipment or special tools required for adjustment or fault finding procedures.

vii

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

What's in this book Chapter 7 - Technical Data The full technical specification of the AT-2plus Memory is given in this chapter.

Chapter 8 - Glossary This chapter explains all the acronyms and signal titles used in this book and in the AT-2plus Memory circuit diagrams.

Circuit Diagrams & Board layouts The circuit diagrams and component layouts are provided for all boards. These details are provided for information only.

viii

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

Chapter 1 Operating Elements

Contents Introduction List of Symbols

1.2 1.2

Location & Power Switching On and Off

1.3 1.3

The Keyboard

1.4

LCD Screen

1.6

AT-2plus Short Form Operating Instructions

1.7

Modes of Operation

1.8

Automatic Mode

1.9

Manual Mode

1.10

Settings

1.12

Automatic Mode (ECG) Settings

1.20

Memory and Data Transmission Option Erasing Memory Files Transmitting Stored Files Transmission Settings Modem Transmission Line Transmission

1.24 1.25 1.25 1.25 1.26 1.27

Software Updating via RS-232

1.28

Care & Maintenance

1.29

Replacing the Recording Paper

1.31

Thermal Paper Handling

1.32

Page 1.1

Chapter 1 Operating Elements

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Introduction The CARDIOVIT AT-2plus is a 6-channel ECG recorder with all (12) ECG signals 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. The AT-2plus includes the following features: •

Low weight and compact dimensions

•

Large A4 size printout from integrated quality thermal printer

•

Built-in rechargeable battery for mains-independent use - 4hrs normal use or 300 printouts on one battery charge

•

Large, clear LCD for ECG preview prior to printing

•

Simple one key operation for main functions

•

Automatic or manual recording modes

•

Selectable printing formats

•

ECG memory for easy copying

•

Interpretation program option (including measurements) for children and adults

•

Alphanumeric keyboard for patient data entry and clinical comments

List of Symbols

Page 1.2

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

Location & Power 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 unit should not be placed near X-ray or diathermy units, large transformers or motors. The unit must be placed on a flat surface and must not be operated in areas where there is any danger of explosion.

Power Supply The mains connection is on the rear of the unit. 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 isa indicted on the top line of the LCD. Power Indication

HR: 76/min

Wed 20-AUG-96 18:20:21

R L F C1 C2 C3 C4 C5 C6

When mains is connected a mains symbol is displayed (as shown above). When the unit is running on battery power a battery symbol is displayed: When battery capacity is limited, the battery symbol flashes on and off. 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 gives approximately 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.

Switching On and Off The CARDIOVIT AT-2plus is switched on with 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 the patient cable is not connected.

Potential Equalisation If the AT-2plus is used in conjunction with other patient connected equipment, we recommend that the potential equalisation stud on the rear of the unit is connected to the hospital/ building common ground with the yellow/green ground cable (Part-no. 2.310005). When working from an emergency vehicle, the vehicle common ground can be used. Page 1.3

Chapter 1 Operating Elements

The Keyboard

Page 1.4

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

The Keyboard (cont.) 1 Print extra copy - of Auto mode recording currently in memory. Press the ALT key first followed by this key to obtain a copy in Auto format 2. 2 Display/enter patient data. When the patient data is displayed, pressing this key again returns to the ECG. Use the up/down arrows to go to the next data entry field. In the `Born` (date of birth field), only the patients year of birth need be entered if desired. When two digits are entered (patients year of birth), the AT-2plus calculates the age of the patient according to the year entered. When the full DOB is entered, the age is calculated precisely. 3 Myogram filter ON / OFF. The cutoff frequency can be defined and is detailed in `Settings`. 4. The top figures on the number keys designated > and < changes the lead group displayed on the screen. 5. Auto sensitivity key - automatically sets the ECG printout sensitivity ( in AUTO mode only) to the best setting for the signal strength (5mm/mV or 10mm/mV) 6. The top figures on the number keys designated 5, 10, and 20 set the sensitivity of the ECG both on the screen and on the (manual) printout. The sensitivity is 5, 10 or 20 mm / mV. 7. The top figures on the number keys designated 5/10, 25, and 50 set the speed of the ECG both on the screen and on the (manual) printout. The speed on the screen can only be set to 25 or 50 mm / s. The speed of the manual printout can be 5, 10, 25 or 50 mm/s. The 5 and 10 mm/s settings are both on the same key which toggles the two speeds. 8. The top character `QRS` toggles the QRS beeper ON/ OFF 9. Delete last typed character. 10. Switch the unit OFF. 11. Switch the unit ON. 12. Manual mode recording - start continuous printout of ECG - until STOP key pressed 13. Auto Mode recording (in Auto mode 1). Press ALT followed by the AUTO key for auto mode 2. 14. STOP printout / confirm (new) setting 15. ALT key - key for initiation of setups and selection of second format for printout and auto mode recording 16. In ECG mode use the UP/DOWN arrows to adjust screen contrast. When entering patient data use the LEFT/RIGHT arrow keys to move cursor in data field. Use the UP/DOWN arrow keys to go up/down to the next data entry 17. Mains Indicator - lit when mains connected. Second letters on the keyboard - è, é, ç, ø are reached by holding the ALT key pressed before the letter key. Accents on a letter e.g. ô, ñ etc. are reached by pressing <SHIFT> and then the letter. In addition the following special characters are available (AT-2plus Memory only !): Key combination: SHIFT + 1

2

3

4

5

6

7

8

9

0

Character

@

#

$

%

&

/

*

"

=

!

Page 1.5

Chapter 1 Operating Elements

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

LCD Screen

1. Current Heart Rate (averaged over 4 beats and refreshed every 2 seconds). The HR is also given on a manual printout. Note that with an auto mode printout the HR is averaged over the full 10 seconds of the recording. 2. Top line - Current Day, Date and Time Bottom Line - System messages 3. Top Line - Current power source - mains or battery. When battery capacity is limited the battery symbol flashes. Bottom line - `ALT` in this box indicates that the ALT key has been pressed. 4. Electrode connections - when a lead flashes it indicates that the electrode resistance is too high. The electrode must be reapplied 5. Lead indication (leads currently displayed on the screen). Change the lead group with the keys `1` and `2`. 6. Myogram Filter indication - `Filter` = filter ON; no indication = filter OFF. Switch the filter on or off with the Filter key. 7. An `A` in this box indicates that automatic sensitivity is selected (auto mode printout only). Switch automatic sensitivity on or off with key `3`. 8. Sensitivity - 5, 10 or 20 mm/mV. Change the sensitivity with the keys `4`, `5`, and `6`.

Page 1.6

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

AT-2plus Short Form Operating Instructions

Automatic ECG Recording • Prepare skin, hook up patient. • Switch unit on, press ON

.

• Press

and enter patient data.

• Press

again and wait for at least 10 seconds until

a clear and stable trace is displayed. • Press AUTO

to record and print.

• Press COPY

for additional copies.

Manual ECG Recording (Rhythm Strip) · Prepare skin, hook up patient. • Switch unit on, press ON

.

• Press MAN START

.

• Change lead group with

1

• Press STOP

and

2

.

to stop the printout.

Electrode hook-up check ·

Press ALT

1mV

AUTO

AUTO

0

3

3

for electrode check.

Best results are obtained when the electrode voltage readings (right column) are between ±50mV. Filter On/Off •

Press

to switch the (Myogram) filter On / Off.

System Configuration • Press ALT

1mV

0

1

1

to print system settings.

Page 1.7

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

Modes of Operation

Automatic Mode Automatic Mode provides a printout giving 10 seconds of ECG recording of all 12 leads with a choice of 2 different formats. Lead format and chart speed can be programmed freely for each of the 2 formats before recording. With the optional interpretation program installed it 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`.

Manual Mode Manual Mode provides a real time printout of 6 leads that are selected and indicated on the screen. 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` following. Page 1.8

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

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. AUTO

When the AUTO SENSITIVITY key 3 is pressed before recording in automatic mode, the unit 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. An `A` on the bottom line of the LCD indicates that Auto sensitivity is set.

To start the automatic ECG recording in Format 1, press the AUTO key:

To start the automatic recording in the second format, press the ALT key followed by the AUTO key: ALT

+

The printout gives the following: •

ECG recording of all leads in either Standard or Cabrera format according to selection

•

Sensitivity

•

Heart Rate

•

Speed

•

Filter Settings

•

Time and Date

•

Interpretation statements

•

Average Cycles

•

Intervals

•

Axis

•

Sokolow Index (ECG index for hypertrophy)

•

Detailed Measurement Table

To obtain an extra printout of the ECG recording in Format 1, simply press the COPY key:

COPY To obtain an extra printout of the second format, press the ALT key followed by the COPY key:

ALT - COPY The Auto mode settings for the two formats are detailed in the paragraph entitled `Settings for Automatic Mode` later in this book

Page 1.9

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

Manual Mode Manual mode provides a direct printout of the real-time ECG with full control of parameter selection. To start the manual recording of a real-time ECG, press the MANUAL Printout key

To stop the manual recording (printout) press the STOP key

The printout provides you with the following: •

Six (selected) leads with lead identification.

•

On the lower edge, the chart speed, user identification and filter settings (if on).

•

At the top, the heart rate as current average of 4 beats, trace sensitivity, and the time and date

The following can be freely chosen during or before the recording:

Lead Group

by means of the LEAD FORWARD and LEAD BACKWARD key 1

2

The following lead groups are selectable: •

I, II, III

aVR, aVL, aVF

(Cabrera: aVL, I, -aVR / II, aVF, III)

Note:

•

V1, V2, V3

/

V4, V5, V6

•

II, aVF, III

/

V2, V4, V5

•

V4, V5, V6

/

V7, V8, V9

The LCD only displays three leads at one time. When the lead forward or lead backward key is pressed, the following /preceding three lead group is displayed

Leads

Select leads Entry Key Sequence

Lead group

0

For software versions higher than 4.10 it is also possible to chose further leads. The desired leads are activated as shown in the table.

1 2 3 4 ALT

7

9 5 6 7 8 9

Page 1.10

Rhythm II, avF, III, V2, V4, V5 Rhythm II, avF, III, V2, V4, V5 Left posterior V4, V5, V6, V7, V8, V9 Left posterior V4, V5, V6, V7, V8, V9 Right precordial up to V5r V1, V2, V3, V3r, V4r, V5r Right precordial up to V5r V1, V2, V3, V3r, V4r, V5r Right precordial up to V6r V1, V2, V3r, V4r, V5r, V6r Right precordial up to V6r V1, V2, V3r, V4r, V5r, V6r NEHB D, A, J NEHB D, A, J

Confirm

ON OFF ON OFF ON Press STOP key OFF ON OFF ON OFF

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Chapter 1 Operating Elements

Manual Mode (cont.) Chart Speed

Notes:

Select speed 5, 10, 25 or 50mm/s by means of the SPEED keys: 5/10

25

50

7

8

9

Key 7 is a toggle key -press once and 5 is selected, press a second time and 10mm/s is selected. When the 25 or 50mm/s key is pressed, the same speed is set on both the screen and the (manual) printout. When 5 or 10 mm/s is selected, this affects the manual printout speed only.

Sensitivity

Myogram Filter

Select 5, 10 or 20 mm/mV by means of the SENSITIVITY keys: 5

10

20

4

5

6

Switch the filter ON or OFF with the FILTER key:

`FILTER` is displayed on the bottom line of the LCD when the filter is switched on. Recentering

To re-centre the ECG traces, press the 1mV key

1mV

0

WARNING AFTER HEAVY ARTEFACTS OR LEAD OFF, THE INDICATION OF THE HEART RATE MAY NOT BE RELIABLE.

Page 1.11

Chapter 1 Operating Elements

SCHILLER AT-2plus 6-Channel ECG Unit SERVICE HANDBOOK Issue d May 2002

Settings Each parameter is set by means of a code. This code comprises a combination of keys starting with the ALT key followed by two or three numbers. The setting is confirmed with the STOP key. As soon as the ALT key is pressed, the keyboard is dedicated to the programming function. Note:

When the ALT key is pressed `ALT` appears on the LCD (see previous page)

Note:

The Alternative (ALT) function is only active for 4 seconds. If a programming key is not pressed within 4 seconds, the unit reverts to standard mode. The ALT key must again be pressed to activate the programming mode

The setting is remembered and the keyboard released for other functions when the STOP key is pressed. Once a setting has been confirmed, it is stored in the memory even when the unit is switched off.

Example If you want to reset your AT-2plus to the basic default settings, the key sequence given on page 14 is ALT; 0; 6; 6. STOP. On the following pages the programmable parameters and the programming sequences are described in detail.

Page 1.12