DeWalt DWHT77100-XJ User manual

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DWHT77100-XJ
User Manual
Please read these instructions before operating the product.
www.dewalt.eu
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Contents
• User Safety
• Battery Safety
• Setup (Load Batteries)
• Setup LDM
• Operation
• Warranty
• Error Codes
• Specifications
Retain all sections of this manual for
futurereference.
User Safety
WARNING: Carefully read the Safety
Instructions and Product Manual
before using this product. The person
responsible for the product must ensure
that all users understand and adhere to
theseinstructions.
WARNING: The following label
information is placed on your laser tool
to inform you of the laser class for your
convenience andsafety.
The DWHT77100 tools emit a visible laser
beam, as shown in FigureA1. The laser beam
emitted is Laser Class 2per IEC 60825‑1.
WARNING: While the laser tool is in
operation, be careful not to expose your
eyes to the emitting laser beam (red
light source). Exposure to a laser beam
for an extended time period may be
hazardous to your eyes. Do not look
into the beam with opticalaids.
WARNING: To reduce the risk of
injury, user must read the Product User
manual, Laser Safety manual, and
Battery Safetyinformation.
CAUTION:Use of controls or
adjustments or performance of
procedures other than those specified
herein may result in hazardous
radiationexposure.
Battery Safety
WARNING: Batteries can explode or
leak and cause serious injury or fire. To
reduce the risk:
• ALWAYS follow all instructions and
warnings on the battery label and package.
• DO NOT short any battery terminals.
• DO NOT charge alkalinebatteries.
• DO NOT mix old and new batteries. Replace
all of them at the same time with new
batteries of the same brand andtype.
• DO NOT mix batterychemistries.
• DO NOT dispose of batteries infire.
• ALWAYS keep batteries out of reach
ofchildren.
• ALWAYS remove batteries if the device will
not be used for severalmonths.
• NOTE: Ensure that the recommended
batteries areused.
NOTE: Ensure the batteries are inserted in the
correct manner, with the correctpolarity.
Setup (LoadBatteries)
1. Locate the battery compartment latch on
the back of the tool (FigureD2).
2. Using your finger, pull the latch up to
unlock and remove the battery door
(FigureE1 and2).
3. Insert two AAA batteries, making sure to
position the ‑ and + ends of each battery
as noted inside the battery compartment
(FigureE3).

6
E4. Slide the pins at the bottom of the battery
door into the notches in the battery
compartment (FigureE4).
5. Push the battery door down until it snaps
in place (FigureE5).
When the tool is ON, the battery level appears
in the display window (FigureC1).
SETUP LDM
Turn On Tool
Click On (FigureA3) to turn on thetool.
Changing the ReferenceLocation
The tool will measure the distance from the
bottom (FigureF1) or top (FigureF2) of the
tool to the wall orobject.
1. Press and hold the gear button
(FigureA4) for 3seconds.The
measurement reference location icon
(FigureC5) will flash on the display
window.
2. Press the gear button again to change the
referencelocation.
3. Press the On button (FigureA3) to
confirm the referencelocation.
Changing the Unit of Measure
Once the current measurement is taken (the
device is not in Continuous Measure mode),
you can change the unit of measure from
decimal ft (6.21 ft) to fractional ft (6'02"9/16),
fractional ft to meters (1.894 m), meters to
inches (74 9/16 in), or inches to decimalft.
• To change the measurement unit, hold
the gear button (FigureA4) for three
seconds to enter the units menu. Press
the on button to confirm your reference
location. Once confirmed, the current
unit of measurement will be displayed,
press the gear to change units and the on
button to confirm
OPERATION
Measuring Distance to a Wall
orObject
1. Point the laser (FigureA1) toward the
wall or object whose distance you need to
measure (FigureF).
2. Press On button (FigureA3) to measure
the distance from the tool to the wall or
object. Refer to Setup LDM to change
the reference location and / or unit
ofmeasurement.
3. At the bottom of the display window
(FigureA2), view the current
measurement (FigureC3), which will
keep changing as you move thetool.
To record the measurement click On. To record
another measurement, click On again.Then
repeat steps 1‑3.
Measuring Area
You can measure the area of a wall, floor,
orobject.
1. Press the gear button (FigureA4) once
to show the area icon (FigureB1) on the
display window (FigureA2).
Measure thelength.
1. Position the tool at one end of the target
and point the laser dot across the length.
(FigureG1 shows where to position the
tool if measuring from the top of the tool.)
2. Press On to display the length
measurement on the first line of the
displaywindow.
Measure thewidth.
1. Point the top of the tool at one side of the
target (wall, floor, orobject).
2. Position the tool at one end of the target
and point the laser dot across the width.
(FigureG2 shows where to position the
tool if you are measuring from the top of
the tool.)

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E
3. Press On to display the width
measurement at the top of the
displaywindow.
View the Area measurement at the bottom of
the display window (FigureE3).
Measuring Volume
You can measure the volume of a room
orobject.
1. Press the gear button (FigureA4) three
times to show the indirect measurement
height on the display window
(FigureE3).
Measure thewidth.
1. Point the top of the tool at one side of the
target (room orobject).
2. Position the tool at one end of the target
and point the laser dot across the width.
(FigureH1) shows where to position the
tool if you are measuring from the top of
the tool.)
3. Press to display the width measurement at
the top of the displaywindow.
Measure thelength.
1. Position the tool at one end of the target
and point the laser dot across the length.
(FigureH2) shows where to position the
tool if you are measuring from the top of
the tool.)
2. Press On to display the length
measurement on the second line of the
displaywindow.
Measure theheight.
1. Positon the tool at one end of the target
and point the laser dot across the height.
2. Press On to display the height
measurement on the third line of the
displaywindow.
View the Volume measurement at the bottom
of the display window (FigureC3).
Measuring the Height of a
TallObject
If you need to measure the height of a tall
object (e.g., a tall building), you can calculate
the height based on the distances from the
same point to 2or 3points on the object.
The tool will use the PythagoreanTheorem
(A2+B2=C2) to calculate theheight.
Measure a distance with two
measurements
You can use the distance to two points on a
tall object (Indirect Height) to determine its
height (FigureI1).
1. Point the tool's laser (FigureA1)
toward a wall or object, and not toward
anyone'seyes.
2. Press On button (FigureA3) to turn the
tool on and display the red laserdot.
3. Press the gear button (FigureA4) three
times to show pythagoras (FigureB1) on
the displaywindow.
4. Position the tool opposite the bottom of
the building or object whose height you
need to measure (FigureI2).
5. Aim the laser at the highest point of the
building or object (FigureI2).
6. Press On button (FigureA3) to measure
thedistance.
7. From the same point, aim the laser
straight ahead toward the lowest point of
the building or object (FigureI3).
8. Press On button (FigureA3) to measure
thedistance.
9. On the bottom line of the screen, view the
height of the building orobject.
Measure a distance with three
measurements
You can use the distance to three points on a
tall object to determine its height (FigureJ1).

8
E1. Point the tool's laser (FigureA1)
toward a wall or object, and not toward
anyone'seyes.
2. Press On button (FigureA3) to turn the
tool on and display the red laserdot.
3. Press the gear button (FigureA4) four
times to show pythagoras on the display
window (FigureC7).
4. Position the tool opposite the
approximate center of the vertical height
to be measured (FigureJ2).
5. Aim the laser at the highest point of the
building or object (FigureJ2).
6. Press On button (FigureA3) to measure
thedistance.
7. From the same point, aim the laser
straight ahead toward the center of the
building or object (FigureJ3).
8. Press On button (FigureA3) to measure
thedistance.
9. From the same point, aim the laser at the
lowest point of the building or object
(FigureJ4).
10. Press On button (FigureA3) to measure
thedistance.
11. On the bottom line of the screen, view the
height of the building orobject.
Adding Measurements
You can add two measurements to get a total
measurement of the twodistances.
1. Press gear button (FigureA4) to show
the addition icon on the display window
(FigureC4)
2. Press On button (FigureA3) to measure
the distance from the tool to the wall
orobject.
3. Press the On button to record the first
measurement on the topline.
4. Point the laser (FigureA1) toward the
next wall orobject.
5. Press the On button to record the second
measurement on the middleline.
6. View the total of the two measurements
at the bottom of the display window
(FigureC3).
Subtracting Measurements
You can subtract one measurement
fromanother.
1. Press gear button (FigureA4) to show
the subtraction icon on the display
window (FigureC3).
2. Point the laser at the top of the tool laser
(FigureA1) toward the wall or object
whose distance you need tomeasure.
3. Press On button (FigureA3) to measure
the distance from the tool to the wall
orobject.
4. Press the On button to record the first
measurement on the topline.
5. Point the laser at the top of the tool
toward the next wall orobject.
6. Press the On button to record the second
measurement on the middleline.
7. View the difference of the two
measurements at the bottom of the
display window (FigureC3).
NOTE: If Second measurement is larger
than first: IC 601will be displayed
for a negative number. Please switch
measurement points so first measurement
is larger than second
Turning Off the Tool
The tool can be turned off in either of
theseways:
• Press and hold the on button
(FigureA3) for several seconds (until the
display windowclears).
• If you do not use the tool for 180seconds,
it will automatically turnoff.

9
E
THREE YEAR LIMITED WARRANTY
DEWALT will repair, without charge, any defects
due to faulty materials or workmanship for
three years from the date of purchase.This
warranty does not cover part failure due to
normal wear or tool abuse. For further detail
of warranty coverage and warranty repair
information, visit www.DEWALT.com or call
1–800–4‑DEWALT (1–800–433–9258). This
warranty does not apply to accessories or
damage caused where repairs have been
made or attempted by others.This warranty
gives you specific legal rights and you may
have other rights which vary in certain states
orprovinces.
In addition to the warranty, DEWALT tools are
covered by our:
1YEAR FREE SERVICE
DEWALT will maintain the tool and replace
worn parts caused by normal use, for free, any
time during the first year afterpurchase.
90DAY MONEY BACK GUARANTEE
If you are not completely satisfied with the
performance of your DEWALT Power Tool,
Laser, or Nailer for any reason, you can return it
within 90days from the date of purchase with
a receipt for a full refund ‑ no questionsasked.
RECONDITIONED PRODUCT: Reconditioned
product is covered under the 1Year Free
Service Warranty.The 90Day Money Back
Guarantee and the ThreeYear Limited Warranty
do not apply to reconditionedproduct.
FREE WARNING LABEL REPLACEMENT: If your
warning labels become illegible or are missing,
call 1‑800‑4‑DEWALT or visit your local service
center for a freereplacement.
Protecting the Environment
Separate collection. This product must
not be disposed of with normal
householdwaste.
Should you find one day that your DEWALT
product needs replacement, or if it is of no
further use to you, do not dispose of it with
household waste. Make this product available
for separatecollection.
Separate collection of used products
and packaging allows materials to be
recycled and used again. Re‑use of
recycled materials helps prevent environmental
pollution and reduces the demand for
rawmaterials.
Local regulations may provide for separate
collection of electrical products from the
household, at municipal waste sites or by the
retailer when you purchase a newproduct.
DEWALT provides a facility for the collection
and recycling of DEWALT products once they
have reached the end of their working life. To
take advantage of this service please return
your product to any authorised repair agent
who will collect them on ourbehalf.
You can check the location of your nearest
authorised repair agent by contacting your
local DEWALT office at the address indicated in
this manual. Alternatively, a list of authorised
DEWALT repair agents and full details of our
after‑sales service and contacts are available on
the Internet at: www.2helpU.com.
Batteries
• When disposing batteries, think of the
protection of theenvironment.
• Check with your local authorities
for an environmentally safe way of
batterydisposal.

10
EError Codes
If INFO appears on the display window with a Code number, perform the corresponding Corrective Action.
Code Description Corrective Action
IC101 Received signal too high Target is too reective. Use the target plate or change the
target surface.
IC201 Too much background light Reduce the background light on the target area.
IC302 Temperature out of range Allow device too warm or cool and repeat measurement
IC303 Distance not in range or
signal too low
Adjust range, if within range change target surface
IC401 Battery too low for
measurements
Recharge battery or change batteries if non‑rechargeable
IC505 Hardware error Switch the device on/off several times. If error still occurs, return
device to Service Center or Distributor
IC601 Negative number Measure longer distance before shorter distance for positive result
IC604 Invalid measurement for
calculation
Remeasure distances, hypotenuse must be larger than sides of
triangle

11
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Specifications
Range .2 m to 30 m
Measuring Accuracy* ± 3 mm*
Resolution** 1 mm**
Laser Class Class 2 (IEC/EN60825‑1: 2014)
Laser Type ≤1.0 mW @ 620‑690nm
Backlight Automatic Switch‑off After 20s
Laser After 120s
Unit Automatic Switch‑off After 180s
Continuous Measuring Yes
Area/Volume Yes
Battery Life (2 x AAA) Up to 3000 Measurements
Dimension (H x D x W) 120 x 48.5 x 26 mm
Weight (with Batteries) 100 g
Storage Temperature Range ‑10 ° C ~ +60 C
Operating Temperature Range 0 ° C ~ +40 ° C
*Measuring Accuracy depends on the current conditions:
• Under favorable conditions (good target surface, low background illumination, and room temperature), up to 10 m. The
measurement error can increase by ± 0.1 mm/m for distances over 10 m
• In unfavorable conditions (poor target surface, high background illumination, operating temperatures at the Upper or lower
end of the temperature range), the measurement range may be reduced and the accuracy can increase to ± 6 mm for
distances under 10 m. Beyond 10 m the measurement error can increase by ±0.25 mm/m.
**Resolution is the nest measurement you can see. In mm, that is 1 mm.