Mortara Instrument ELI 100 User manual

REF: 9502-057-50 A1
ELI 100
Operator’s
Manual
________________________________________________________________
CAUTION: Federal law restricts this device for sale to and use by or on the order of a physician.

®
Copyright© 2002
by Mortara Instrument, Inc.
7865 N. 86th Street
Milwaukee, Wisconsin 53224
This document contains confidential information that belongs to Mortara Instrument, Inc. No part of this document
may be transmitted, reproduced, used, or disclosed outside of the receiving organization without the express written
consent of Mortara Instrument, Inc. Mortara is a registered trademark of Mortara Instrument, Inc. ELI 100 is a
trademark of Mortara Instrument, Inc.
9500-090-01 A1

i
Technical Support and Service
Following are telephone numbers and addresses for contacting various technical support and service personnel.
Mortara Instrument, Inc.
7865 N. 86th St.
Milwaukee, WI 53224
Telephone Number: 414-354-1600
Toll-free Telephone Number: 800-231-7437
Toll-free Service Number: 888-MORTARA
Fax: [phone]
E-mail address: [email protected]
24 hour technical support
Over 120 trained field service technicians
Same day shipment of replacement parts
Biomedical training classes
Extended warranties/service contracts
Sales Support/Supplies & Accessories
Mortara Instrument, Inc.
7865 N. 86th St.
Milwaukee, WI 53224
Phone: [phone]
Fax: [phone]
Internet: http://www.mortara.com
European Economic Community Representative
Mortara Rangoni
Via Oradour, 7 40016
San Giorgio di Piano
Bologna, Italy
Phone: [phone]
Fax: [phone]
Mortara Instrument, Inc., GMBH (Germany)
Henricistr. 124
45136 Essen
Telephone number: 49-201-268311
Fax: [phone]
Mortara Instrument, Inc., B.V.
(The Netherlands).
H. Dunantplein 6
3731 CL De Bilt
Postbus 131
3720 AC Bilthoven
Telephone number: 31-30-2205050
Fax: [phone]

ii
Notices
Manufacturer’s Responsibility
Mortara Instrument, Inc., is responsible for the effects on safety, and performance only if
•Assembly operations, extensions, re-adjustments, modifications or repairs are carried out by persons
authorized by Mortara Instrument,
•The electrical installation of the relevant room complies with the requirements of appropriate regulations, and
•The ELI 100 is used in accordance with the instructions for use.
•Upon request, Mortara will make available a service manual containing technical information to assist an
appropriately qualified individual with potential service related issues, though it is highly recommended that if
there are concerns regarding the devices performance, Mortara Service is contacted at 1-800-877-8942.
Responsibility of the Customer
The user of this product is responsible for ensuring the implementation of a satisfactory maintenance schedule.
Failure to do so may cause undue failure and possible health hazards.
Equipment Identification
Mortara Instrument equipment is identified by serial numbers on the back or bottom of the device. Care should be
taken so that these numbers are not defaced.
Information pertinent to tracking and manufacturing is found on the bottom of the product and may be called upon
if service of the device is required.
Copyright and Trademark Notices
This document contains information that is protected by copyright. All rights are reserved. No part of this
document may be photocopied, reproduced or translated to another language without prior written consent of
Mortara Instrument, Inc. The information contained in this document is subject to change without notice.
Other Important Information
The information in this document is subject to change without notice.
Mortara Instrument, Inc., makes no warranty of any kind with regard to this material, including, but not limited to
implied warranties of merchant ability and fitness for a particular purpose. Mortara Instrument, Inc., assumes no
responsibility for any errors of omissions that may appears in this document. Mortara Instrument makes no
commitment to update nor to keep current the information contained in this document.

iii
Warranty Information
Your Mortara Warranty
MORTARA INSTRUMENT, INC. (hereinafter referred to as “Mortara”) hereby warrants that Mortara products
(hereinafter referred to as “Products”) shall be free from defects in material and workmanship under normal use,
service and maintenance for the warranty period of such Product from Mortara or an authorized distributor or
representative of Mortara. Normal use, service and maintenance means operation and maintenance in accordance
with appropriate instructions and/or information guides. This Warranty does not apply to damage to the Products
caused by any or all of the following circumstances or conditions:
a) Freight damage;
b) Parts and/or accessories of the Products not obtained from or approved by Mortara;
c) Misapplication, misuse, abuse and failure to follow the Product instruction sheets and/or information
guides;
d) Accident, a disaster affecting the Products;
e) Alterations or modifications to the Products not authorized by Mortara;
f) Other events outside of Mortara’s reasonable control or not arising under normal operating
conditions.
THE REMEDY UNDER THIS WARRANTY IS LIMITED TO THE REPAIR OR REPLACEMENT WITHOUT
CHARGE FOR LABOR OR MATERIALS, OR ANY PRODUCTS FOUND UPON EXAMINATION BY
MORTARA TO HAVE BEEN DEFECTIVE. This remedy shall be conditioned upon receipt of notice by Mortara
of any alleged defects promptly after discovery thereof within the warranty period. Mortara’s obligations under the
foregoing warranty will further be conditioned upon the assumption by the purchaser of the Products (i) of all
carrier charges with respect to any Products returned to Mortara’s principal place or any other place as specifically
designated by Mortara or an authorized distributor or representative of Mortara, and (ii) all risk of loss in transit. It
is expressly agreed that the liability of Mortara is limited and that Mortara does not function as an insurer. A
purchaser of a Product, by its acceptance and purchase thereof, acknowledges and agrees that Mortara is not liable
for loss, harm or damage due directly or indirectly to an occurrence or consequence therefrom relating to the
Products. If Mortara should be found liable to anyone under any theory (except the expressed warranty set forth
herein) for loss, harm or damage, the liability of Mortara shall be limited to the lesser of the actual loss, harm or
damage, or the original purchase price of the Product when sold.
EXCLUDED FROM THE LIMITED WARRANTY SET FORTH ABOVE ARE CONSUMABLE ITEMS SUCH
AS PAPER, BATTERIES, ELECTRODES, PATIENT CABLES, LEAD WIRES AND MAGNETIC STORAGE
MEDIUMS.
EXCEPT AS SET FORTH HEREIN WITH RESPECT TO REIMBURSEMENT OF LABOR CHARGES, A
PURCHASER’S SOLE EXCLUSIVE REMEDY AGAINST MORTARA FOR CLAIMS RELATING TO THE
PRODUCTS FOR ANY AND ALL LOSSES AND DAMAGES RESULTING FROM ANY CAUSE SHALL BE
THE REPAIR OR REPLACEMENT OF DEFECTIVE PRODUCTS TO THE EXTENT THAT THE DEFECT IS
NOTICED AND MORTARA IS NOTIFIED WITHIN THE WARRANTY PERIOD. IN NO EVENT,
INCLUDING THE CLAIM FOR NEGLIGENCE, SHALL MORTARA BE LIABLE FOR INCIDENTAL,
SPECIAL OR CONSEQUENTIAL DAMAGES, OR FOR ANY OTHER LOSS, DAMAGE OR EXPENSE OF
ANY KIND, INCLUDING LOSS OF PROFITS, WHETHER UNDER TORT, NEGLIGENCE OR STRICT
LIABILITY THEORIES OF LAW, OR OTHERWISE. THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY
OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE IMPLIED
WARRANTY OF MERCHANT ABILITY AND THE WARRANTY OF FITNESS FOR A PARTICULAR
PURPOSE.

iv
User Safety Information
Warning:
Means there is the possibility of personal
injury to you or others.
Caution:
Means there is the possibility of damage to
the equipment.
Note: Provides information to further assist in the
use of the device.
Federal law restricts this device to sale by or on the order of a physician.
Warning(s)
•Device (electrocardiograph, Class 1) captures and presents data reflecting a patient’s physiological condition
that when reviewed by a trained physician or clinician can be useful in determining a diagnosis. However, the
data should not be used as a sole means for determining a patient’s diagnosis.
•To ensure that electrical safety is maintained during operation from AC (~) power, the device must be plugged
into a Hospital Grade outlet.
•To maintain designed operator and patient safety, peripheral equipment and accessories used that can come in
direct patient contact, must be in compliance with UL 2601-1, IEC 601-1 and IEC 601-2-25.
•To maintain designed operator and patient safety, only use parts and accessories supplied with the device and
available through Mortara Instrument, Inc.
•To avoid the possibility of serious injury or death during patient defibrillation, do not come into contact with
device or patient cables. Additionally, proper placement of defibrillator paddles in relation to the electrodes is
required to minimize harm to the patient.
•To ensure the safety of both the patient and the device, 1.5 meters (5 feet) of open area should surround the
patient.
•A possible explosion hazard exists, do not use the device in the presence of flammable anesthetics.
•ECG electrodes could cause skin irritation and should be examined for signs of irritation or inflammation.
•Before attempting to use the device for clinical applications the operator must read and understand the contents
of the manual and any documents accompanying the device.
•Where the integrity of external PROTECTIVE EARTH CONDUCTOR arrangement is in doubt,
EQUIPMENT shall be operated from its internal ELECTRICAL POWER SOURCE.
•To maintain operator and patient safety, when connecting the ELI 100 to peripheral equipment not in
compliance with UL2601-1, IEC 601-1 or IEC 601-2-25, consideration should be given to the requirements of
IEC 601-1-1.
•The ELI 100 has not been designed for use with high-frequency (HF) surgical equipment and does not provide
a protective means against hazards to the patient.

v
•When connected to an external modem, a protective earth conductor must be attached to the ELI 100. The
connection may be through the mains power supply cord, or by a separate protective earth conductor attached
to the metal chassis of the ELI 100. The external modem and its power supply must comply with the
requirements of IEC 60950, safety of information technology equipment, including electrical business
equipment.
•Leakage currents can increase if additional devices are connected to the patient.
•All signal input and output (I/O) connectors are intended only for devices complying with EN 60601-1,
excluding the network connectors(s), that must only be used for connections to supporting Mortara Instrument
systems when cabling is supplied or approved by our Mortara Instrument Representative.
•Connecting/disconnecting cable at the back of the device must be done with the device OFF (main power).
Caution(s)
•To prevent possible damage to the keypad, do not use sharp or hard objects to depress keys, only use
fingertips.
•Do not attempt to clean the device or patient cables by submersing into a liquid, autoclaving, or steam
cleaning.
•Wipe the exterior surface of the device and patient cables with a sterilizing disinfectant, then dry with a clean
cloth.
•Conductive parts of the patient cable, electrodes and associated Type CF connections, including the neutral
conductor of the patient cable and electrode, should not come into contact with other conductive parts,
including earth ground.
•The rechargeable internal battery is a sealed lead acid type and it is totally maintenance free. If the battery
appears to become defective, refer to Mortara Instrument Service Department.
•Do not pull or stretch patient cables as this could result in mechanical and/or electrical failures. Patient cables
should be stored after forming them into a loose loop.
•The quality of the signal produced by the electrocardiograph may be adversely affected by the use of other
medical equipment, including but not limited to defibrillators and ultrasound machines.

vi
Notes
•Excessive patient movement could interfere with the operation of the device.
•Proper patient preparation is important to proper application of ECG electrodes and operation of the device.
•Patient cables should be checked for cracks or breakage in its exterior properties prior to use.
•There is no known safety hazard if other equipment, such as pacemakers or other stimulators, are used
simultaneously with the ELI 100; however, disturbance to the signal may occur.
•If the ECG input becomes inoperable due to excessive saturation or overload, the display will indicate a lead
fail for the lead(s) that this condition is present and if the signal is being printed the respective lead(s) will print
out as a square wave.
•As defined by IEC 601-1 and IEC 601-2-25, the device is classified as follows:
- Class I equipment
- Type CF applied parts
- Ordinary equipment
- Not suitable for use in the presence of flammable anesthetics
-Continuous operation
•The ELI 100 will automatically turn off (blank screen) if the batteries have been severely discharged.
•After operating the ELI 100 using battery power, always reconnect the power cord and depress the I on the I/O
power switch. This ensures that the batteries will be recharged for the next time you use the ELI 100. The
word CHARGING or AC Power will appear on the LCD screen.

vii
Equipment Symbols
Symbol Delineation
Attention, consult accompanying documents
Alternating current
Protective earth (ground)
Earth (ground)
Fuse
Telephone line (modem)
Defibrillator-proof type CF input
Thermal paper
Equipotentiality
Output/Transmit

viii
Input
ON (power)
OFF (power)
"ON" only for part of Equipment
"OFF" only for part of Equipment
Stop (of action)
Shift key (to enter upper case text)
Space key
Enter key (accept data/return)
⌫Backspace/Delete key
Initiate printing of 12-Lead ECG

ix
Initiate printing of continuous rhythm strip
High-speed serial data
Eject
Indicates compliance to applicable EEC directives

x
Table of Contents
1Introduction
Manual Purpose.............................................................................................................................................. 1-1
Audience ......................................................................................................................................................... 1-1
Conventions .................................................................................................................................................... 1-1
System Description ......................................................................................................................................... 1-1
ELI 100, Illustration ......................................................................................................................................... 1-2
ELI 100 Specifications .................................................................................................................................... 1-3
Setup and Installation ..................................................................................................................................... 1-4
ELI 100, Two Views: Left Side and Rear ........................................................................................................ 1-4
Rear (Fuse Installation)................................................................................................................................... 1-5
Configuration Settings..................................................................................................................................... 1-5
Initial Configuration ......................................................................................................................................... 1-7
Protected Configuration .................................................................................................................................. 1-7
Protected Configuration Screen Summary ..................................................................................................... 1-8
Protected Configuration Screen A .................................................................................................................. 1-8
AC Filter .......................................................................................................................................................... 1-8
Storage Format ............................................................................................................................................... 1-8
Protected Configuration Screen B .................................................................................................................. 1-9
Storage Sensitivity .......................................................................................................................................... 1-9
Protected Configuration Screen C .................................................................................................................. 1-9
Plot Format...................................................................................................................................................... 1-9
Interpretation Format ...................................................................................................................................... 1-9
Protected Configuration Screen D .................................................................................................................. 1-10
Plot Channels.................................................................................................................................................. 1-10
Protected Configuration Screen E .................................................................................................................. 1-11
Units ................................................................................................................................................................ 1-11
Date Format .................................................................................................................................................... 1-11
Protected Configuration Screen F................................................................................................................... 1-11
Baud Rate ....................................................................................................................................................... 1-11
Auto Delete ..................................................................................................................................................... 1-12
Protected Configuration Screen G.................................................................................................................. 1-12
Serial Port ....................................................................................................................................................... 1-12
CAPS Lock...................................................................................................................................................... 1-12
Protected Configuration Screen H .................................................................................................................. 1-12
Pre-append site number to patient ID............................................................................................................. 1-13
Protected Configuration Screen I.................................................................................................................... 1-13
Phone Number ................................................................................................................................................ 1-13
Protected Configuration Screen J ................................................................................................................... 1-14
Internal Modem Baud Rate ............................................................................................................................. 1-14
Protected Configuration Screen K .................................................................................................................. 1-14
Auto Save........................................................................................................................................................ 1-14
Cueing............................................................................................................................................................. 1-14
Protected Configuration Screen L................................................................................................................... 1-15
Site Number .................................................................................................................................................... 1-15
Cart Number.................................................................................................................................................... 1-15
Copies ............................................................................................................................................................. 1-15
Retrieve Serials............................................................................................................................................... 1-15
Protected Configuration Screen M.................................................................................................................. 1-15
ID Format ........................................................................................................................................................ 1-16
Protected Configuration Screen N .................................................................................................................. 1-16
Rhythm Lead Selection................................................................................................................................... 1-17

xi
Protected Configuration Screen O...................................................................................................................1-17
Site Name ........................................................................................................................................................1-17
Protected Configuration Screen P...................................................................................................................1-17
Key Click Volume Setting ................................................................................................................................1-18
Persistent Configuration ..................................................................................................................................1-19
Load Thermal Paper.......................................................................................................................................1-20
Apply Power....................................................................................................................................................1-20
ELI 100 Supply List..........................................................................................................................................1-21
100
Operation
2
Starting the System .........................................................................................................................................2-1
Operation .........................................................................................................................................................2-1
AC Power Operation........................................................................................................................................2-1
Battery Operation.............................................................................................................................................2-1
Patient Preparation..........................................................................................................................................2-2
Patient Hookup ................................................................................................................................................2-2
ID Menu Formatting.........................................................................................................................................2-2
Selecting the ID Menu .....................................................................................................................................2-3
ID Menu Prompts.............................................................................................................................................2-3
ID Menu Sequence (Long Format)..................................................................................................................2-5
3Acquiring and Printing a 12-Lead ECG
ECG Selection Screen Description..................................................................................................................3-1
ECG Analysis...................................................................................................................................................3-2
ECG Activity Screen Description .....................................................................................................................3-2
Taking a Second ECG.....................................................................................................................................3-3
Selecting an E-SCRIBE Patient File................................................................................................................3-4
Request Selection Screen ...............................................................................................................................3-4
4Ac
q
uirin
g
and Printin
g
a Rh
y
thm Stri
p
Rhythm Selection Screen Description.............................................................................................................4-1
Acquiring Routine Rhythm Strips.....................................................................................................................4-1
Rhythm Activity Screen Description ................................................................................................................4-1
Usin
g
the S
p
ecial Functions
5
Special Function Screen Description...............................................................................................................5-1
Directory Description .......................................................................................................................................5-1
Printing a Directory ..........................................................................................................................................5-2
Directory Screen Sequence.............................................................................................................................5-2
Patient Selection Screen Description ..............................................................................................................5-4
Selecting a Patient Name ................................................................................................................................5-4
Erasing a Patient's ECGs ................................................................................................................................5-4
Listing a Patient's ECGs ..................................................................................................................................5-5

xii
Selecting a Specific ECG................................................................................................................................ 5-5
Patient ID Screen Description......................................................................................................................... 5-5
Erasing a Specific ECG .................................................................................................................................. 5-6
Maintenance on a Specific ECG ..................................................................................................................... 5-6
Directory Maintenance Screen Description .................................................................................................... 5-6
Updating or Adding Patient ID Information ..................................................................................................... 5-7
Transmitting ECGs.......................................................................................................................................... 5-7
Direct Connection Hookup .............................................................................................................................. 5-7
Telephone Connection Hookup ...................................................................................................................... 5-7
Sending ECGs ................................................................................................................................................ 5-8
Receiving ECGs.............................................................................................................................................. 5-8
Batch Plotting .................................................................................................................................................. 5-9
Downloading a Request List ........................................................................................................................... 5-9
Request Activity Screen Description............................................................................................................... 5-9
Printing the Request List................................................................................................................................5-10
6Maintenance and Troubleshooting
Troubleshooting Chart .................................................................................................................................... 6-1
Self-Test Printout Description ......................................................................................................................... 6-2
Self-Test Printout Sample, Pg. 1 of 2.............................................................................................................. 6-3
Self-Test Printout Sample, Pg. 2 of 2.............................................................................................................. 6-4
Cleaning and Inspection ................................................................................................................................. 6-5
Inspecting the ELI 100 .................................................................................................................................... 6-5
Cleaning the ELI 100 ...................................................................................................................................... 6-5
Cleaning the Patient Cable ............................................................................................................................. 6-5
Cleaning the Writer Printhead......................................................................................................................... 6-5
Appendix System Information LogA
System Information Log .................................................................................................................................. A-1
A
pp
endix Sam
p
le Print Formats
B
Rhythm Strip (RHY) Description ..................................................................................................................... B-1
3-Channel ECG Format Description ............................................................................................................... B-1
4-Channel ECG Format Description ............................................................................................................... B-1
6-Channel ECG Format Description ............................................................................................................... B-1
3+3 ECG Format Description ......................................................................................................................... B-2
Measurement Matrix (MSR) Description......................................................................................................... B-2
Measurement Matrix Acronym List ................................................................................................................. B-2
Standard Rhythm Strip Sample (default, reduced) ......................................................................................... B-4
6-Channel Frontal Rhythm Sample (reduced) ................................................................................................ B-5
6-Channel Precordial Rhythm Sample (reduced) ........................................................................................... B-6
12-Channel Rhythm Sample (reduced) .......................................................................................................... B-7
3-Channel ECG Sample (reduced) ................................................................................................................. B-8
4-Channel ECG Sample (reduced) ................................................................................................................. B-9
6-Channel ECG Sample (reduced) ................................................................................................................B-10
3+3 ECG Sample (reduced)...........................................................................................................................B-11
Measurement Matrix Sample (reduced) ........................................................................................................B-12

xiii
Glossary ............................................................................................................................................. G-1
Index........................................................................................................................................................ I-1
Figures
Figure 1-1 ELI 100......................................................................................................................................... 1-2
Figure 2-1 ELI 100 Left and Rear.................................................................................................................. 1-4
Figure 3-1 ELI 100 Rear (Fuse Installation) .................................................................................................. 1-5

____________________________________________________________________________Section 1
1-1
1Introduction
Manual Purpose
The ELI 100 Operator's Manual explains how to operate the ELI 100 interpretive and non-interpretive
electrocardiographs. You can use this manual as a learning tool as well as a source of reference information. It
explains how to:
•Set up the electrocardiograph.
•Use and understand the keyboard, the viewing screen, and the menu sequences.
•Enter, modify, and delete information.
•Acquire a 12-lead electrocardiogram
•Print an ECG rhythm strip
Audience
This manual is written for clinical research professionals. They are expected to have working knowledge of medical
procedures and terminology as required for monitoring cardiac patients.
Conventions
Text that the user must type, such as a:install, appears in bold, Times New Roman font.
Keys, such as ENTER, appear in bold, upper-case, Arial font.
Text that appears on the screen, such as C:\Portrait, appears in normal, Arial font.
System Description
The ELI 100 is a diagnostic electrocardiograph capable of acquiring and printing ECG data in a hospital and/or
clinical environment. If the ELI 100 is equipped with the computerized interpretation option installed and is
enabled, which is at the user’s discretion, the acquired electrocardiogram may assist in allowing the physician to
more quickly determine what care options may be available for the patient.
The printout offers a variety of formats: three, four or six channels in automatic mode and three, six, or twelve
channels during rhythm recording. The ELI 100 can operate on batteries or line power.

ELI 100_____________________________________________________________________________
1-2
The ELI 100 consists of:
•Electrocardiograph
•ELI 100 Operator’s Manual and short form instruction card
•Accessory Kit
Figure 1-1, ELI 100, Illustration

____________________________________________________________________________Section 1
1-3
ELI 100 Specifications
Leads available: I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, V6
ECG input: Simultaneous input from all 12 leads
Input impedance: Meets the requirements of ANSI/AAMI EC11
Input dynamic range: Meets the requirements of ANSI/AAMI EC11
Electrode offset tolerance: Meets the requirements of ANSI/AAMI EC11
Common mode rejection: Meets the requirements of ANSI/AAMI EC11
Patient leakage rejection: Meets the requirements of ANSI/AAMI ES1
Chassis leakage current: Meets the requirements of ANSI/AAMI ES1
Frequency response: Meets the requirements of ANSI/AAMI EC11
Digital sampling rate: 10,000 samples/sec/channel (used for pacemaker
artifact detection); 500 samples/sec/channel (used for
recording and analysis)
Special computer
functions:
Arm lead reversal detection; lead-off and/or artifact
detection; drift reduction; AC interference rejection
Power: 100-240VAC at 50 or 60Hz, or internal batteries
Weight: 11 pounds (4.9kg)
Dimensions: 11 1/4” x 11 1/2” x 3 3/4” (28.1 x 28.7 x 9.3 cm)
Recording technique: Computer controlled thermal dot array (200 dots/inch)
Paper type: Thermal sensitive, full grid, 108mm width, roll
Recording speeds: 5, 10, 25, 50mm/sec, computer controlled
Recorder time resolution: 1msec
Sensitivity: 5, 10, and 20mm/mV

ELI 100_____________________________________________________________________________
1-4
Setup and Installation
Figure 2-1, ELI 100
Caution: When the fuse is installed, battery will gradually discharge over time. To
guarantee battery life, always connect the power cord and depress the I on the I/O power
switch to ensure the batteries will be recharged for your next use. The word CHARGING or AC
Power will appear on the LCD screen. If fuse is removed, stored data and configuration
settings will be lost.
100The battery fuse is installed in the back of the unit, as pictured above. The fuse is installed so the ELI 100 can
store data, operate on the internal battery, and save the configuration settings.
One end of the fuse is covered with a plastic tip; the other end has a silver cap. If a new fuse needs to be installed,
follow the steps below:
nHold the fuse by the plastic tip and insert the silver-capped end into the round socket, which is located near
the fuse “Warning” instructions on the back of the ELI 100.
oRotate the fuse in the socket so that approximately 1/4" of the plastic cap sticks out.
pIn a clockwise motion, press the plastic cap into the socket using your thumb or a screwdriver. The cap
should be almost flush with the unit.