Leica DISTODXT User manual

Leica DISTO
™
DXT
The original laser distance meter

1Symbols used in this manual
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User Manual
English
Congratulations on the purchase of your
Leica DISTO™ DXT.
The safety instructions and the user
manual should be read through
carefully before you use the
product for the first time. The
person responsible for the product must ensure that
all users understand these directions and adhere to
them.
Symbols used in this manual
The symbols used have the following meaning:
WARNING
Indicates a potentially hazardous situation or
an unintended use which, if not avoided, could result
in death or serious injury.
CAUTION:
Indicates a potentially hazardous situation or
an unintended use which, if not avoided, may result
in minor injury and/or in appreciable material, finan-
cial and environmental damage.
)Important paragraphs which must be adhered
to in practice, as they enable the product to be used
in a technically correct and efficient manner.
Intended Use
Permitted uses
• Measuring distances
• Computing functions, e.g. areas and volumes
Adverse uses
• Using the instrument without instructions
• Using outside the stated limits
• Deactivation of safety systems and removal of
explanatory and hazard labels
• Opening of the equipment by using tools (screw-
drivers etc.)
• Carrying out modification or conversion of the
product
• Use of accessories from other manufacturers
without the express approval of Leica Geosys-
tems.
• Deliberate or irresponsible behaviour on scaf-
folding, when using ladders, when measuring
near machines which are running, or near parts of
machines or installations which are unprotected
• Aiming directly into the sun
• Deliberate dazzling of third parties; even in the
dark
• Inadequate safeguards at the surveying site (e.g
when measuring on roads, construction sites,
etc.)

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Intended Use Leica DISTO™ DXT 776113
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Limits of use
)Also see section "Technical data".
The Leica DISTO™ is designed for use in areas perma-
nently habitable by humans, do not use the product
in explosive hazardous areas or in aggressive environ-
ments.
Responsibilities
Responsibilities of the manufacturer of the orig-
inal equipment Leica Geosystems AG, CH-9435
Heerbrugg (for short Leica Geosystems):
Leica Geosystems is responsible for supplying the
product, including the User Manual and original
accessories, in a completely safe condition.
(Additional language versions can be found at:
www.disto.com)
Responsibilities of the manufacturer of non-
Leica accessories:
The manufacturers of non-Leica accessories for the
Leica DISTO™ are responsible for developing, imple-
menting and communicating safety concepts for their
products. They are also responsible for the effective-
ness of these safety concepts in combination with
the Leica Geosystems equipment.
Responsibilities of the person in charge of the
instrument:
WARNING
The person responsible for the instrument
must ensure that the equipment is used in accord-
ance with the instructions. This person is also
accountable for the deployment of personnel and for
their training and for the safety of the equipment
when in use.The person in charge of the product has
the following duties:
• To understand the safety instructions on the
product and the instructions in the user manual.
• To be familiar with local safety regulations
relating to accident prevention.
• To inform Leica Geosystems immediately if the
equipment becomes unsafe.

3Overview
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Overview
Keyboard
1ON/DIST (ON/MEASURING) - key
2PLUS [+] - key
3MINUS [-] - key
4AREA/VOLUME - key
5PYTHAGORAS - key
6REFERENCE - key
7HISTORICAL MEMORY/UNITS - key
8CLEAR/OFF - key
Display
1Laser"ON"
2 Reference (front/rear/end piece/tripod)
3min/maxdisplay
4 Battery status
5Area/volume
6 Info symbol
7Pythagoras
8 Historical memory
9 Intermediate line 3
10 Intermediate line 2
11 Intermediate line 1
12 Main line
13 Detailed display
14 Ceiling area
15 Wall area
16 Circumference
1
2
4
6
8
3
5
7
43 567 8
9
10
11
12
1
13
14
15
16
2

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Start up Leica DISTO™ DXT 776113
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Start up
Inserting / Replacing Batteries
1 Fold out the end-piece.
2 Open the locking mechanism with a coin or
screwdriver and lift the battery compartment
cover.
3 Insert batteries, observing correct polarity.
4 Close the battery compartment.
• Replace the batteries when the symbol flashes
permanently in the display.
)Only use alkaline batteries.
)If the instrument will not be used for a long
time, remove the batteries as a protection against
corrosion.
)To ensure the instrument remains watertight,
you should avoid getting dirt on the battery compart-
ment seals.
Operation
Measuring Conditions
Range
Range is limited to 70 m.
At night or dusk and if the target is in shadow the
measuring range without target plate is increased.
Use a target plate to increase the measurement
range during daylight, or if the target has poor reflec-
tion properties!
Target Surfaces
CAUTION:
Measuring errors can occur when measuring
toward colourless liquids (e.g. water) or dust free
glass, Styrofoam or similar semi-permeable surfaces.
Aiming at high gloss surfaces may deflect the laser-
beam and lead to measurement errors.
Hazards of Use
CAUTION:
Watch out for erroneous distance measure-
ments if the instrument is defective or if it has been
dropped or has been misused or modified.
Precautions:
Carry out periodic test measurements.
Particularly after the instrument has been subject to

5Operation
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abnormal use, and before, during and after important
measurements.
Make sure the Leica DISTO™ optic is kept clean and
that there is no mechanical damage to the bumpers.
CAUTION:
In using the instrument for distance measure-
ments or for positioning moving objects (e.g. cranes,
building equipment, platforms, etc.) unforeseen
events may cause erroneous measurements.
Precautions:
Only use this product as a measuring sensor, not as
a control device. Your system must be configured and
operated in such a way, that in case of an erroneous
measurement, malfunction of the device or power
failure due to installed safety measures (e.g. safety
limit switch), it is assured that no damage will occur.
Switching on/off
1x briefly: the instrument and the laser are
switched on.
The display shows the battery symbol until
the next button is pressed.
Pressing this button for longer switches the
instrument off.
The instrument switches off automatically after
three minutes of inactivity.
Setting the unit
Press long until the desired unit is displayed.
Possible units:
CLEAR-Key
1x briefly: the last action is cancelled.
Distance Area Volume
1. 0.000 m 0.000 m² 0.000 m³
2. 0'0'' 1/80.000 m² 0.000 m³
3. 0 in 1/80.000 m² 0.000 m³
4. 0'0'' 1/16 0.00 ft² 0.0 ft³
5. 0 in 1/16 0.00 ft² 0.0 ft³
6. 0.00 ft 0.00 ft² 0.0 ft³

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Operation Leica DISTO™ DXT 776113
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Reference Setting
Default reference setting is from the rear of the
instrument.
The instrument can be set for the following measure-
ments:
• To measure from an edge, fold out the posi-
tioning bracket until it snaps in for the first time.
• To measure out of a corner, fold out the stop
bracket until it snaps in, push the stop bracket
with a little force to the right side; the stop
bracket can now be completely unfolded.
)The device automatically recognises the
measurement position and adjusts the following
measurement.
1x briefly: the next measurement is taken from
the front edge. After one measurement, the
reference returns automatically to the default
setting (rear reference).
2x briefly: the measurement is taken from the
rear reference (default setting).
1x long: The measurements are taken continu-
ously from the front edge. A brief press on the
key cancels the continuous measurement
setting again.

7Measuring
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Measuring
Single Distance Measurement
1x briefly: the laser is activated.
1x briefly: a distance measurement is taken.
The result is displayed immediately.
Continuous measurement
Distances can be staked out with this function
1x long: a "beep" is sounded. A continuous
measurement is started.
1x briefly: the continuous measurement is
stopped.
The last measured value is displayed in the summary
line.
Minimum-/Maximum-Measuring
This function enables determining the minimum or
maximum distance from a specific measuring point,
e.g. the determination of room diagonals (maximum
value) or horizontal distance (minimum value).
Switching on continuous measurement (see above).
The corresponding maximum and minimum values are
displayed.
Functions
Addition / Subtraction
Distance Measurement.
1x briefly: the next measurement is added to
the previous one.
1x briefly: the next measurement is subtracted
from the previous one.
Repeat this procedure for as many times as required.
The result is displayed in the summary row, the previ-
ously measured value is displayed in intermediate line
2, the value to be added in intermediate line 1.
1x briefly: the last step is cancelled.
Area function
1x briefly: The symbol is displayed.
1x briefly: takes first distance measurement
(e.g. length)
1x briefly: takes second distance measurement
(e.g. width)
The result of the area measurement is displayed in
the summary row, the individually measured values
are displayed in intermediate lines 1 and 2.
A long press on the key displays the perimeter
.

8
Functions Leica DISTO™ DXT 776113
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Adding and subtracting areas
Calling up the area function and measuring areas.
Press or .
1x briefly: takes first distance measurement
(e.g. length)
1x briefly: takes second distance measurement
(e.g. width)
The result of the second area measurement, "+" flashes.
1x briefly: confirms the addition; the added area
results are displayed in the summary row.
Volume function
2x briefly: the symbol is displayed.
1x briefly: takes first distance measurement
(e.g. length)
1x briefly: takes second distance measurement
(e.g. width)
The result of the area measurement from the values
already measured is displayed in the summary row.
1x briefly: takes the third distance measure-
ment (e.g. height). The value is displayed in
intermediate line 1.
The calculated volume appears in the summary line,
the last three measured values appear in interme-
diate lines 1, 2, 3.
Press the button for longer to display additional
room information such as circumference ,
ceiling/floor area , surface area of the walls .
Indirect Measurement
The instrument can measure distances with the
Pythagoras method. This procedure facilitates in
measuring distances that are difficult to access.
)Adhere to the prescribed sequence of meas-
urements:
• All target points must be vertical or horizontal on
the surface of the wall.
• The best results are achieved when the intrument
is rotated around a fixed point (e.g. the stop
bracket is fully extended and the instrument is
placed against a wall).
• To take the measurement, the minimum/
maximum function can be called up. The minimum
value is used for measurements that must be at
right-angles to the target; the maximum distance
is used for all other measurements.
)Make sure that the first measurement and the
distance to be measured are at right angles. Use the
minimum/maximum function.

9Functions
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Indirect measurement - determining a
distance using 2 auxilliary measurements
1x briefly: the symbol is displayed.
The distance to be measured flashes in the symbol.
1x briefly: takes a measurement of the distance
The second distance to be measured flashes in the
symbol
1x briefly: takes a measurement of the hori-
zontal distance
The result of the function is displayed in the summary
row.
If the button is pressed for along time while
measuring a distance, maximum or minimum contin-
uous measuring is activated.
Indirect measurement - determining a
distance using 3 auxilliary measurements
2x briefly: the symbol is displayed.
The distance to be measured flashes in the symbol.
1x briefly: takes a distance measuement
The second distance to be measured flashes in the
symbol
1x briefly: takes a horizontal measurement.
The third distance to be measured flashes in the
symbol
1x briefly: takes a measurement of the distance
The result of the function is displayed in the summary
row.
If the button is pressed for along time while
measuring a distance, maximum or minimum contin-
uous measuring is activated.
1
2
3

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Appendix Leica DISTO™ DXT 776113
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Historical memory
1x briefly: the symbol and the last measured
value are displayed.
Use the "+" or "-" buttons to navigate through the
last 10 values. A long key press allows the values to
be used in other functions.
Switching off the beep
Press and hold simultaneously for 3 seconds:
The beep is switched off.
To reactivate it, press and hold for 3 seconds.
Appendix
Display Notices
All display notices are either displayed with or
"Error". The following errors can be corrected.
Cause Correction
204 Calculation error Repeat procedure
252 Temperature too
high Let device cool down.
253 Temperature too
low Warm device up
255 Received signal too
weak, time for a
measurement too
long.
Use a target plate
256 Received signal too
strong Use target plate (gray side)
257 Faulty measure-
ment, too much
background light
Use target plate (brown
side)
258 Outside of the range
of measurement Select measurement distance within the
range of measurement
Error Cause Correction
Error Hardware error Should this message
remain active after
switching the instru-
ment off and on several
times, please contact
your dealer.

11 Appendix
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Technical Specifications
* Use a target plate to increase the measurement range
during daylight or if the target has poor reflection properties!
** in favourable conditions (good target surface properties,
room temperature) up to 10 m. In unfavourable conditions,
such as intense sunshine, poorly reflecting target surface or
high temperature variations, the deviation over distances
above 10 m can increase by ± 0.15 mm/m.
Electromagnetic Compatibility
(EMC)
The term "electromagnetic compatibility" is taken to
mean the capability of the product to function
smoothly in an environment where electromagnetic
radiation and electrostatic discharges are present,
and without causing electromagnetic interference to
other equipment.
WARNING
The Leica DISTO™ conforms to the most strin-
gent requirements of the relevant standards and
regulations.
Yet, the possibility of the product causing interfer-
ence in other equipment cannot be fully excluded.
Laser classification
The Leica DISTO™ produces a visible laser beam
which emerges from the front of the instrument.
Range 0.05 m to 70 m*
Measuring accuracy (2 σ ) typically ± 1.5 mm**
Smallest unit displayed 1 mm
Laser class 2
Laser type 635 nm, < 1 mW
Protection against
splashes and dust IP 65
Autom. power off:
Laser
Instrument after 60 s after 180 s
Illumination
9
Fold out endpiece 9
Battery life,
Type 2 x AAA up to 5 000 measurements
Dimension 123 x 55 x 28 mm
Weight 159 g
Temperature range:
Storage
Operation -25°C to +70°C 0°C to +40°C

The product is a Class 2 Laser Product in accordance
with:
• IEC60825-1 : 2007 "Radiation safety of laser
products"
Class 2 Laser Products:
Do not stare into the beam or direct it unnecessarily
at other persons. Eye protection is normally afforded
by aversion responses including the blink reflex.
WARNING
Looking directly into the laser beam with
optical aids (e.g. binoculars, telescopes) can be
hazardous.
Precautions:
Do not look directly into the beam with optical aids.
CAUTION:
Looking into the laser beam may be hazardous
to the eyes.
Precautions:
Do not stare into beam. Do not look into the laser
beam. Make sure the laser is aimed above or below
eye level (particularly with fixed installations, in
machines, etc.).
Labelling
Position of the type label:
Laser Radiation
Do not stare into the beam
Laser class 2
acc. IEC 60825-1:2007
Maximum radiant power *: <1mW
Emitted wavelength: 620-690nm
Beam divergence 0.16 x 0.6 mrad
Impulse duration 1 x 10 -9 s
2

13 Appendix
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Care
Wipe off dirt with a damp, soft cloth. Do not use
aggressive cleaning agents or solutions.
Warranty
The Leica DISTO™ DXT comes with a three* year
warranty from Leica Geosystems.
More detailed information can be found at:
www.disto.com
* To receive the three year warranty, the product must be
registered on our website www.disto.com within eight
weeks of the purchase date. If the product is not registered,
a two year warranty applies.
Disposal
CAUTION:
Flat batteries must not be disposed of with
household waste. Care for the environment and take
them to the collection points provided in accordance
with national or local regulations.
The product must not be disposed with
household waste.
Dispose of the product appropriately in
accordance with the national regulations in
force in your country.
Adhere to the national and country specific regula-
tions.
Product specific treatment and waste management
information can be downloaded from the Leica
Geosystems home page at
http://www.leica-geosystems.com/treatment or
received from your Leica Geosystems dealer.
All right reserved for changes (drawings, descriptions
and technical specifications).

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Appendix Leica DISTO™ DXT 776113
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Leica Geosystems AG
CH-9435 Heerbrugg
(Switzerland)
www.disto.com
Leica Geosystems AG, Heerbrugg, Switzerland has been certified as being equipped
with a quality system which meets the International Standards of Quality
Management and Quality Systems (ISO standard 9001) and Environmental
Management Systems (ISO standard 14001).
Total Quality Management - Our commitment to total customer satisfaction. Ask
your local Leica Geosystems agent for more information about our TQM program.
Copyright Leica Geosystems AG, Heerbrugg,
Switzerland 2009
Translation of original text (776113)
Pat. No.: WO 9427164, WO 9818019, WO 0244754, WO 0216964,
US 5949531, EP 1195617, US 7030969, WO 03104748