DeFelsko PosiTector RTR H User manual

Instruction Manual
Replica Tape Reader
H
H

Introduction
The PosiTector Replica Tape Reader (RTR H) is a hand-held
electronic instrument that measures burnished Testex Press-O-
FilmTM replica tape to produce peak-to-valley surface profile height
measurements. It consists of a PosiTector body ( tandard or
Advanced) and probe.
To ensure best accuracy, the user will be prompted to
zero the probe every time the Gage is powered-up. It is therefore
recommended to clean the probe regularly with the included clean-
ing card. Cleaning is best performed when the Gage is powered
down.
NOTE:
1
Press the button to power up the Gage. To conserve battery
life, the gage will automatically go to sleep after 5 minutes of
inactivity. While in leep Mode, the gage powers up significantly
faster— convenient when moving between parts or locations. The
gage will completely power off after 4 hours of inactivity.
Alternatively, select Power Off from the main menu. All settings
are retained.
Quick tart
With the Gage powered down...
1. Clean the probe with the included cleaning card (pg. 5).
2. Power-up Gage by pressing the center navigation button .
3. Zero the probe (pg. 6).
4. Verify Gage accuracy (pg. 5).
5. Measure the burnished replica tape (pg. 3).
Menu Operation
To access the Menu, power-up the gage, then press the center
navigation button . Either the keypad or touch screen can be
used to navigate the menu. If desired, touch screen functionality
can be disabled within the Setup menu (See Touch, pg. 9).
Select a menu option by touching it, or use the and but-
tons to highlight the desired option and press to select it.
On menus longer than one page, the current page number is dis-
played below the menu name. Navigate between pages using
when the first menu item is selected, or when the last

2
menu item is selected. If using touch, navigate between pages
by touching or , or by swiping up or down.
When powered-up, the PosiTector automatically
determines which probe is attached and does a self-
check.
To disconnect a probe from a body, slide the plastic
probe connector horizontally (in the direction of the
arrow) away from the body. Reverse these steps to
attach a different probe. It is not necessary to power-
down the Gage when switching probes.
The PosiTector gage body accepts a wide variety of probe
types including magnetic, eddy-current and ultrasonic coating
thickness, surface profile, environmental, hardness, salt
contamination and ultrasonic wall thickness probes. See
www.defelsko.com/probes
Press-O-Film Replica Tape
Press-O-Film provides a simple way to obtain an impression of a
surface for analysis. It consists of a layer of crushable plastic
micro foam affixed to a 50.8 µm (2 mils) incompressible polyester
film. When compressed against a roughened surface, the foam
collapses and acquires an accurate impression, or reverse
When a Menu option is highlighted, the
icon indicates on-gage help is available.
Press or touch the icon to display the
help. A formatted PDF containing all on-
gage help items is available at
www.defelsko.com/help
indicates that a sub-menu exists for the
Menu option. Select the option to display its
sub menu.
Update your gage to ensure that you
have the latest on-gage help information.
NOTE:
Probes
Press the button or swipe right to return to a previous screen.
Select Exit to close the Menu.

replica, of the surface. It is available in
Coarse (C) and X-Coarse (XC) grades to
accommodate measurements in different
profile ranges.
Placing the compressed tape (replica) into the PosiTector RTR H
gives a measure of the average maximum peak-to-valley height
of the surface roughness profile. The Gage automatically subtracts
the thickness of the polyester film from all measurements.
How to Measure
Prepare the test surface
1. Prepare the test surface
2. Burnish the replica tape
3. Prepare the Gage
4. Measure
ocate a representative site for measurement. Clean
the surface to be tested. DeFelsko recommends the
use of the included putty to remove dust, debris, or
residual blast media from the surface.Firmly press the
putty onto the surface using your fingers, and remove.
Burnish the replica tape (create a replica)
Select the appropriate grade of replica
tape based on the target profile. See
tape instructions for assistance.
Pull a single adhesive-backed replica
tape free of its release paper. A “bull’s
eye” circle of paper should remain on
the release paper (it is not used for
measurement).
Apply replica tape to blasted surface. Press the adhesive-
backed ends of the tape to hold it firmly in place during the
burnishing process.
Firmly compress the foam using the rounded
end of the included stainless steel burnishing
tool. Apply sufficient pressure in a circular and
x-y rubbing motion to produce a
replica with a
3

4
uniform pebble grain appearance. Excessively hard rubbing
should be avoided because the polyester film could become
distorted. It normally takes 30 to 60 seconds to fully compress
all parts of the foam on most surfaces. After burnishing is
complete, remove the replica tape from the surface.
Prepare the Gage
Power-up the Gage by pressing the center navigation button.
An image appears indicating that the probe requires zeroing.
Simultaneously press and hold both probe buttons
firmly until the Gage beeps and the arrows point
outward. Do not place anything in the
measurement opening during this procedure.
Measure the included check shim to verify accuracy (pg. 5).
Ensure the correct grade of replica tape, C or XC, is displayed in
the upper left corner of the gage display (pg. 6).
With the Gage powered-down, clean the measurement surfaces
using the included cleaning card. Swipe the card through the
probe opening a few times while firmly pressing both probe
buttons to remove dust particles and residual tape adhesive.
Measure
Insert the burnished replica tape into the
probe opening as far as it will go. Ensure
the tape is properly positioned so that the
burnished region is centered within the
opening with the adhesive (sticky) side down.
To position the tape, align the two dots (printed on replica tape)
with arrows on both sides of the measurement opening.
Align dots with arrows on probe
During measurement, a constant anvil pressure is applied to the
replica tape regardless of how hard the two buttons are pressed.
The Gage automatically subtracts the 50.8 µm (2 mils) of
incompressible polyester film. No further adjustments are required.

5
1. Ensure tape is properly positioned.
2. Firmly press both probe buttons simultaneously and hold until
the Gage beeps and the surface profile height (H)
measurement is displayed. The tape can now be safely
removed.
The probe contains two measuring surfaces that can become
contaminated with dust particles and residual tape adhesive.
It is therefore a good idea to clean the probe regularly with the
included cleaning card. Cleaning is essential prior to performing
a probe Zero (pg. 6) or a verification of accuracy (below).
Cleaning is best performed when the Gage is powered off.
With the Gage powered-down, swipe the card through the probe
opening a few times while firmly pressing both probe buttons.
The card can also be used to clean the surfaces of analog spring
micrometers. Replacement cards are available.
Cleaning Card
Verification of Accuracy
Calibration
Gage calibration is typically performed by the manufacturer or
accredited lab. All PosiTector RTR H probes include a
Certificate of Calibration.
Calibration & Verification of Accuracy
Ensure that the probe has been cleaned with the included cleaning
card (above) and that the probe has been zeroed (pg. 6).
Place the PosiTector RTR Check him into the probe opening.
The average of several measurements should be within the com-
bined tolerance of both the Gage and the shim. If not, the Gage
may need to be returned for service.
The check shim is specifically intended for all PosiTector RTR
probes. The Gage is designed to measure burnished replica tape
within a limited measuring range and automatically subtracts 50.8
µm (2 mils) from height measurements to account for the incom-
pressible polyester film. Therefore plastic shims intended for other

6
instruments such as coating thickness gages will not be measured
properly.
Cal ettings Menu
The probe should be zeroed regularly to ensure best accuracy.
The user will be prompted to zero the probe every time the Gage
is powered up. The
Zero menu item allows the procedure to be
performed at more regular intervals. It is particularly useful during
long measurement sessions.
Important:
Clean the probe with the included cleaning card
(pg. 5) before performing a probe zero.
1. Select
Zero from the Cal ettings menu
2. Simultaneously press and hold both probe buttons firmly until
the Gage beeps and the arrows point outward. Do not place
anything in the measurement opening during this procedure.
Zero
Simultaneously press and hold both probe buttons
firmly until the Gage beeps and displays “0”. This can be
performed from the main measurement screen without having to
access the menu.
SHORTCUT:
Tape Grade
Selects a replica tape grade. Required when
Linearize
mode (H )
is ON.
C- Coarse
XC - Extra Coarse (default)
Coarse Minus and X-Coarse Plus grades are not
supported in inearize mode since the only function of these two
grades is to improve upon the accuracy of C tape at its low end
and XC tape at its high end, something the
PosiTector RTR H
will automatically do when measuring H . When inearize mode
is OFF, the PosiTector RTR H will measure all grades of replica
tape just like a conventional spring micrometer.
NOTE:

7
Linearize
This is the default measurement mode. Linearize mode is ON when
this box is ticked and the "H " appears on the display.
An undesirable characteristic of replica tape is that measurements
made with analog spring micrometers are most accurate near the
middle of each grade's range and least accurate at the outer ends
of each grade's range. That is why two other grades, Coarse Minus
and X-Coarse Plus, are used to check and, if necessary, adjust
measurements at the lower and upper ends of the primary range of
20-115 µm (0.8-4.5 mils).
Inside the primary range, the upper end of Coarse grade’s range
and the lower end of X-Coarse grade’s range share a 38 - 64 µm
(1.5 - 2.5 mils) "overlap" region. Current Testex instructions describe
a relatively complicated and time consuming procedure (the
average of one reading using Coarse grade and one reading using
X-Coarse grade) that is used to knit the Coarse and X-Coarse sub-
ranges together to achieve reasonably accurate readings over the
primary range. This method is a compromise between accuracy and
ease of use.
nWhen the inearize box is NOT ticked, the PosiTector RTR H
displays a height value of H comparable to the value an analog
spring micrometer would display after the 50.8 µm (2 mils) of
incompressible polyester film has been subtracted. In other words,
it is the average of the maximum peak-to-valley distances obtained
by measuring the thickness of the replica tape without any
correction.
nWhen the inearize box IS ticked, the PosiTector RTR H displays
a more accurate peak-to-valley height measurement H that has
been adjusted for the non-linearity of replica tape. There is no need
to average 2 or more replicas from different grades of tape AND
there is no need to subtract the 50.8 µm (2 mils) of incompressible
polyester film. Ensure the proper tape grade, C or XC, has been
selected (pg. 6) and appears in the upper left corner of the display.
During measurement, if the linearized measurement falls outside
of the selected tape grade's range, the Gage will suggest a more
suitable tape grade to perform the measurement.

8
Reset
Reset (menu reset) restores factory settings and returns the Gage
to a known condition. The following occurs:
- All batches, batch names, and screen captures are erased.
- Menu settings are returned to the following:
Memory = OFF
tatistics = OFF
Display = None
Auto Dim = ON
Tape Grade = XC
Linearize = ON
Bluetooth = OFF
WiFi & Access Point = OFF
U B Keyboard & tream = OFF
BLE Keyboard = OFF
Date, Time and WiFi are not affected by either Reset.
etup Menu
NOTE:
Perform a more thorough Hard Reset as follows:
1. Power down the Gage and wait 5 seconds.
2. Simultaneously press and hold the and buttons
until the Reset symbol appears.
This returns the Gage to a known, “out-of-the-box” condition. It
performs the same function as a menu Reset with the addition of:
- Bluetooth Pairing info is cleared.
- Menu settings are returned to the following:
Units = Microns
Flip Lock = OFF
ound = Medium
Touch = On
Language = English
Battery Type = Alkaline
Backlight = Normal
U B Drive = ON
Auto ync .net = ON
Bluetooth mart = OFF
Units
Converts the display from thou/mils to microns and vice versa.
Adjusts the volume of built-in speaker (Off, ow, Medium, High).
ound

9
Disables the Auto Rotate feature by locking the display in its
current orientation.
Flip Lock
Allows the touch screen functionality to be disabled. All gage
functions can also be controlled using the navigation buttons.
Touch
Selects the type of batteries used in the Gage from a choice of
“Alkaline”, “ ithium” or “NiMH” (nickel-metal hydride rechargeable).
The battery state indicator symbol is calibrated for the selected
battery type. No damage will occur if the battery type used in the
Gage does not match the selected battery type.
Battery Type
All measurements are date and time stamped (24-hour format)
when stored into memory. It is therefore important to set the
correct date and time. Use the and buttons to select a
value, and the and buttons to adjust it. The current date
and time setting can also be viewed at the top of the main menu.
et Clock
tatistics Mode
A statistical summary will appear on the display. Remove the last
reading by pressing the button. Press to clear statistics.
tatistics
–Average
–Maximum Value
–Standard Deviation
–Minimum Value
X
X

10
Advanced models store 250,000 readings in up to 1,000
batches. “New Batch” closes any currently opened batch and
creates a new batch name using the lowest available number.
The icon appears. New batches are date stamped when they
are created.
The PosiTector RTR H has internal memory storage for recording
measurement data. Stored measurements can be reviewed
on-screen or accessed via computers, tablets and smart phones.
Measurements are date and time-stamped.
tandard models store up to 1,000 readings in one batch.
Memory Management
creen Capture
Press both and buttons simultaneously to save an image of
the current display. The last 100 screen captures are stored in
memory and can be accessed when connected to a computer
(see Posi oft U B Drive below).
Create a new batch
(Advanced only)
Scroll through display
modes (Advanced only)
Delete last reading
Restore brightness
after dimming
Access the Menu
Accessing tored Measurement Data
DeFelsko offers the following free solutions for viewing, analyzing
and reporting data:
Posi oft U B Drive - Connect the Gage to a PC/Mac using the
supplied USB-C cable. View and print readings and graphs using
universal PC/Mac web browsers or file explorers. No software or
internet connection required.
Posi oft Desktop - Powerful desktop software (PC/Mac) for
downloading, viewing, printing and storing measurement data.
Includes a customizable, templated PDF Report Generator. No
internet connection required.
Posi oft.net - Web-based application offering secure, centralized
storage of measurement data. Access your data from any web-
connected device.

11
Connect Menu
Allows connection to your local wireless network or mobile
hot spot. Ideal for using your network’s internet connection
for synchronizing stored measurements with PosiSoft.net.
See www.defelsko.com/wifi
WiFi (Advanced models only)
PosiTector App - (Advanced models only) App for compatible iOS
and Android smart devices. Permits users to create, save and share
professional PDF reports. Add images and notes using the smart
device’s camera and keyboard.
When U B Drive is enabled , the PosiTector uses a USB
mass storage device class which provides users with a simple
interface to retrieve stored data in a manner similar to USB flash
drives and digital cameras. U B Drive is also required to import
stored measurements into Posi oft Desktop software
(see pg. 10).
U B
While connected, power is supplied through the included
USB-C cable. The batteries are not used and the body will not
automatically power down.
NOTE:
When enabled and connected to a computer, the PosiTector will be
recognized as a Keyboard. Readings are sent to the computer as
they are taken, emulating keystrokes, followed by a carriage return.
Keyboard
tream
Stream readings via USB Serial Port to SPC data collection
software, drones, ROVs, P Cs, and robotic devices.
(Advanced models only)
(Advanced models only)
For more information on USB Keyboard and
Streaming visit: www.defelsko.com/usb/stream
NOTE:

12
The WiFi and U B menus contain a ync .net Now option.
When selected, the Gage immediately synchronizes stored
measurement data via its respective communication method
(internet connection required).
Alternatively, select Auto ync .net from within the U B connect
menu to automatically synchronize upon connection to a PC.
Additional measurements added to memory while connected are
synchronized only when the USB cable is disconnected and
reconnected, or when the ync .net Now option is selected. WiFi
connected gages automatically attempt synchronization upon
power up.
ync .net Now
Posi oft Desktop is required when using U B to
synchronize measurements with PosiSoft.net.
NOTE:
Allows individual readings to be sent to a computer, printer or
compatible device as they are taken using Bluetooth wireless
technology. See www.defelsko.com/bluetooth
Bluetooth (Advanced models only)
Bluetooth mart
Allows communication with a smart device running the
PosiTector App (pg.11) via auto-pairing Bluetooth mart (B E)
wireless technology.
(Advanced models only)
ync Batches
Select batches to flag them for synchronization to the PosiTector
App. ync Batches is useful when connecting a new device to a
gage with pre-existing batches, since only batches created while
Bluetooth mart is enabled are automatically selected.
Selected batches are synchronized when the next reading is
taken in a batch flagged for synchronization, or when the ync
Batches option is selected at the bottom of the list of selected
batches.
If Bluetooth mart is disabled or disconnected, data
from batches selected in the ync Batches menu are held in a
queue until communication with the PosiTector App is re-
established.
NOTE:

13
The Gage will perform a Hard Reset after an
update. (see pg. 8)
Updates
Determines if a software update is available for your Gage.
See www.defelsko.com/update
WARNING:
BLE Keyboard
When enabled and connected to a computer, the PosiTector will
be recognized as a wireless Keyboard. Readings are sent to the
computer as they are taken, emulating keystrokes, followed by a
carriage return.
(Advanced models only)
end Batches
Transfers selected batches to the PosiTector App. end Batches
is useful when switching between devices, as only readings and
batches that have yet to be synchronized with any smart device
are synchronized automatically.
The end Batches option is visible in the menu when the Gage
is connected to a smart device running the PosiTector App.

www.defelsko.com
© 2020 DeFelsko Corporation USA
All Rights Reserved
This manual is copyrighted with all rights reserved and may not be reproduced or transmitted, in whole or
part, by any means, without written permission from DeFelsko Corporation.
DeFelsko, PosiTector, and PosiSoft are trademarks of DeFelsko Corporation registered in the U.S. and in other
countries. Other brand or product names are trademarks or registered trademarks of their respective holders.
Every effort has been made to ensure that the information in this manual is accurate. DeFelsko is not
responsible for printing or clerical errors.
Limited Warranty, ole Remedy
and Limited Liability
DeFelsko's sole warranty, remedy, and liability are the express
limited warranty, remedy, and limited liability that are set forth on
its website: www.defelsko.com/terms
Returning for ervice
Before returning the Gage for service…
1.Install new or newly recharged batteries in the proper alignment
as shown within battery compartment
2.Clean the measurement opening using the cleaning card (pg. 5)
3.Perform a Hard Reset (pg. 8)
4.Verify accuracy (pg. 5)
5.If issue is not resolved, Update (pg. 13) your PosiTector gage
body and re-attempt measurements.
IMPORTANT:
If these steps do not resolve the issue and the Gage must be
returned for service, please follow the instructions provided at
www.defelsko.com/service.

Manual de Instrucciones
Lector de cinta de replica
H

Con el medidor apagado:
1. Limpie la sonda con la tarjeta de limpieza facilitada. (Pág. 5)
2. Encienda el medidor pulsando el botón central .
3. Cero la sonda (Pág. 6).
4. Verifique la precisión del medidor (Pág. 6).
5. ida el perfil de la cinta de réplica (Pág. 3).
1
Introducción
El PosiTector RTR H (Replica Tape Reader) es un instrumento
eléctrico portátil que mide el perfil de la cinta de réplica Testex
Press-O-Film para producir mediciones del perfil de anclaje de
una superficie. Está formado por un cuerpo (Standard o
Advanced) y una sonda.
Para garantizar una mayor precisión el usuario deberá
poner a cero la sonda cada vez que encienda el medidor. Por lo
tanto será deseable limpiar la sonda regularmente con la tarjeta
de limpieza incluida. La limpieza se realizará mejor cuando el
medidor esté apagado.
NOTA:
Presione el boton para encender el instrumento. Para conser-
var la vida de la bateria, el instrumento entrará en reposo
automáticamente tras 5 minutos de inactividad. Cuando se
encuentra dentro del modo de reposo, el instrumento se reactiva
significativamente más rápido. El instrumento se apagará comple-
tamente después de 4 horas de inactividad. Alternativamente,
seleccione la opcion “Apagar” en el menu principal. Todas las
configuraciones se mantienen.
Inicio rápido
Menú Operación
Para ingresar al menu principal, encienda el medidor, después
presione el botón de navegación . Puede utilizar tanto el
teclado del tablero como la pantalla tactil para navegar en el
menú. Si lo desea, la funcionalidad de la pantalla táctil puede
ser deshabilitada desde el menu “Configurar” (vea Touch, pág.
9).
Seleccione la opcion del menú tocando el título o utilice las
teclas y para señalar la opción del menu de su elección

2
Cuando se resalta una opción del menú,
aparece el ícono informando que hay
información de ayuda disponible para ese
elemento del menú. Presione la tecla o
el ícono para desplegar la informacion de
ayuda. Puede descargar un archivo en for-
mato PDF con todos los items de ayuda del
menú en www.defelsko.com/help
indica la existencia de un sub-menú para
esa opción del menú. Seleccione la opción
para desplegar los elementos del sub-menú.
Actualice periodicamente el medidor
para asegurar que el medidor cuenta con la
información de ayuda del menú más
reciente.
NOTA:
finalmente presione el para validar la selección.
Cuando el contenido del menú necesite desplegarse en más de
una pantalla, se mostrará debajo del título del menú el número
depágina. Podrá navegar entre las páginas del menú usando las
teclas y . Cuando llegue al inicio o final de unalista
presione la tecla respectiva para avanzar o retroceder entre
páginas. Si utiliza la pantalla táctil, simplemente presione or
, o deslice el dedo por la pantalla hacia abajo o arriba.
Presione el botón o deslice el dedo hacia su derecha para
regresar a la pantalla anterior. Selecciones Salir para cerrar el
menú.
Una vez encendido, el PosiTector determinará
automáticamente el tipo de sonda conectado y
realizará una comprobación automática.
Para desconectar una sonda de la base del
PosiTector deslíce el conector de la sonda de plástico
horizontalmente (en la dirección de la flecha)
separándola de la base PosiTector. Invierta los pasos
para conectar una sonda diferente. No es necesario
apagar el medidor cuando se cambia la sonda.
Sondas

3
Cinta de réplica Press-O-Film
Press-O-Film ofrece un método simple para obtener una
impresión de una superficie para su análisis. Se trata de una
lámina de plástico recubierta de microespuma plástica deformable
adherida a una película de 50.8 µm (2 mil) incompresible de
poliéster. Al comprimirse contra una superficie rugosa, la espuma
adquirirá una impresión precisa o réplica
inversa de la superficie. Se vende en
diferentes grados (Coarse - C o X
Coarse - XC) para acomodar las
medidas a diferentes rangos de perfil.
Adicionalmente, el cuerpo del PosiTector es compatible con una
amplia variedad de sondas de tipo magnético, eddy current,
ultrasónica para espesor de película de recubrimiento, perfil de
superficie, condiciones ambientales, dureza, contaminación por
cloruros y ultrasónicas para espesor de pared. Ver
www.defelsko.com/probes
Al colocar la cinta comprimida (réplica) en el PosiTector RTR H
dará una medida del promedio de la altura máxima entre pico y
valle del perfil rugoso de la superficie. El medidor sustraerá
automáticamente el espesor del sustrato de poliéster de todas
las mediciones.
Cómo medir
Preparación de la superficie de prue a
1. Prepare la superficie del área de prueba
2. Perfile la cinta de réplica
3. Prepare el medidor
4. Realice la medición
Encuentre un lugar representativo para la
medición. Limpie la superficie que va a
comprobar. DeFelsko recomienda el empleo de la
masilla suministrada para retirar el polvo, la
suciedad o la granalla residual de la superficie.
Presione con fuerza la masilla sobre la superficie
utilizando los dedos y retírela.

4
Creación de una réplica
Seleccione el grado apropiado de la cinta de réplica según el
perfil deseado. Consulte las instrucciones de la cinta.
Coloque una cinta de réplica autoadhesiva retirando su papel
protector. Un círculo de "ojo de buey" de papel deberá quedar
en el papel de protección (no se utiliza para la medición).
Aplique la cinta de réplica en la superficie.
Presione los extremos adhesivos del papel
para sujetarlo firmemente en su lugar
durante el proceso de perfilado.
Comprima firmemente la película de réplica
utilizando el extremo redondeado de la
herramienta de pulido de acero inoxidable. Aplique una presión
suficiente en círculo y frote en sentidos
transversales para producir una réplica con un
aspecto de grano uniforme. Normalmente se
requieren de 30 a 60 segundos para comprimir
completamente todas las partes de la película
en la mayoría de las superficies. En general, el exceso de
compresión es más seguro que demasiado poca. Una vez
finalizado el perfilado retire la cinta de réplica de la superficie.
Preparación del medidor
Con el medidor apagado, limpie las superficies de medición
utilizando la tarjeta de limpieza facilitada. Deslice la tarjeta a
través de la ranura varias veces mientras presiona firmemente
los dos botones de la sonda para eliminar las partículas de polvo
y el adhesivo residual de la cinta.
Encienda el medidor pulsando el botón central. Aparecerá una
imagen que indica que la sonda requiere su puesta a cero.
Pulse y mantenga con firmeza simultáneamente
ambos botones de la sonda hasta que el medidor
emita un pitido y las flechas apunten hacia el
exterior. No coloque nada en la ranura de
medición durante este procedimiento.
ida la galga de comprobación suministrada para verificar la
exactitud (Pág. 6). Asegúrese de que el grado de la cinta de
réplica adecuado (C o XC) se muestra en la esquina superior
izquierda de la pantalla LCD (Pág. 7).