Extech Instruments DT200 User manual

User Guide
Laser Distance Meter
Extech DT200
DT200

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Introduction
Congratulations on your purchase of the Extech Model DT200 Laser Distance Meter. This meter
measures Distance up to 35m (115’) and calculates Area and Volume. In addition, the DT200
includes a laser pointer for accurate targeting. This meter is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service.
Safety Instructions
This meter has been designed for safe use, but must be operated with caution.
WARNING: Do not directly view or direct the laser pointer at an eye. Low power visible lasers
do not normally present a hazard, but may present some potential for hazard if viewed directly
for extended periods of time.
Laser classification (Class 2)
The DT200 produces a visible Class 2 laser beam from the top of
the instrument. Do not stare into the laser beam or direct the beam
toward anyone’s eyes. Eye protection is normally an automatic
response (‘blink reflex’, for example).
Warning: Do not look directly into the laser beam using optical
aids such as binoculars or telescopes. This can create a hazard.
Permitted Uses
Measure Distances
Compute Area and Volume
Measure Angles
Prohibited Uses
Exceeding the specified measurement limits
Compromising or deactivating the safety systems built into the meter
Removal of hazard or explanatory labels affixed to the meter
Modifying or converting the instrument
Using third party accessories
Operation on scaffolding or ladders without proper safety precautions
Measuring near machines that are operating or near parts of machine installations that are
unprotected
Aiming the meter into the sunlight
Outdoor measurements or measurements on roads, near construction sites, etc. without
adequate safeguards

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Meter Description
Front Panel
1. Laser Pointer
2. Laser Test Beam
3. LCD display area
4. Keypad (described below)
5. Battery compartment on rear of instrument
Display
1. Laser Status icon appears when laser is active
2. Reference level (Top)
3. Reference Level (Bottom)
4. Area, Volume, and Indirect Measurement icons
5. Single Distance Measurement mode
6. Battery status icon
7. Reading Memory Location Number
8. Error icon
9. Continuous MIN-MAX measurement mode
10. Display Line 1
11. Display Line 2
12. Display Line 3 (Summary Display Line)
Keypad
Power ON / Measurement Button
CLEAR / Power OFF Button
Measurement Reference Button
Backlight / Unit Button
MAX-MIN Continuous Measurement Button
Indirect Measurement Button
Memory Button
Add/Subtract Buttons
Area-Volume Button
1
2
3
4
5
DT200

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Operating Instructions
Measurement Considerations
1. For best results, choose a target that is flat, hard and smooth
2. Use a section of cardboard or similar material if the target size needs to be increased
3. Replace the battery if the battery icon appears on the display
4. The meter will not measure through glass, liquid, or Styrofoam
5. Inaccurate measurements may result from any of the following:
Low battery
Measured distance exceeding specified range
Irregular shaped objects near the target
Preparation for Measurements
1. Press the MEAS button to switch the meter ON. The unit automatically switches OFF after
three (3) minutes of inactivity.
2. Press and hold the UNIT button to change the unit of measure (ft = feet, in = inches, m =
meters, and ‘ “ (feet and inches).
3. Use the reference button to select the Top or Bottom distance reference.
In the Top mode (2), the displayed reading will represent the distance from the top of the
meter to the target.
In the Bottom mode (1), the displayed reading will represent the distance from the bottom of
the meter to the target.
Single Distance Measurement
1. Momentarily press the MEAS button to switch the meter ON; Dashes (- - -) will appear on the
display and the Laser pointer will switch ON.
2. Aim the meter and momentarily press the MEAS button again to take and display a reading.
3. The reading will remain on the display for 60 seconds.
12

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MAX-MIN Continuous Measurement Mode
This mode of operation is useful for determining the shortest and longest distances from a given
point.
1. Press the MEAS button to switch the meter ON.
2. Press and Hold the MAX/MIN button for 3 seconds to begin a continuous measurement
session.
3. The meter will beep with each new measurement update (approx. every one half second).
4. The MIN reading will be indicated on the top display line and will update each time a lower
reading (lower than the currently displayed reading) is encountered.
5. The MAX reading will be indicated on the middle display line and will update each time a
higher reading is encountered.
6. The actual reading will be indicated on the bottom display line.
7. To exit this mode of operation, momentarily press the MEAS button.
8. Note that the meter exits to the normal mode of operation after approx. 100 measurements in
continuous mode.
Adding / Subtracting Measurements
A series of measurements can be taken and the sum or difference can be displayed.
1. Press the MEAS button to switch the meter ON.
2. Press the MEAS button to take the first measurement.
3. Press the + button or the - button (+ or – will appear in the display flashing).
4. Press the MEAS button again to take another measurement.
5. The two individual measurements will be shown on display lines 1 and 2.
6. The sum or difference will be indicated on display line 3.
7. Repeat the above steps as desired.
Area Calculation
The DT200 allows the user to compute the area of a room.
1. Press the MEAS button to turn the meter ON; wait several seconds and the Laser pointer will
switch ON.
2. Press the button firmly once.
3. A parallelogram will appear with its length side flashing
indicating that a Length measurement is to be taken.
4. Aim the meter and press MEAS to take the room length measurement.
5. Press the MEAS again to switch the Laser Pointer back ON.
6. The parallelogram will now appear with its Width side flashing
indicating that a Width measurement is to be taken.
7. Press MEAS to take the room width measurement.
8. Lines 1, 2, and 3 will now show the Length, Width, and Area (in ft2or m2) respectively.
Note that the laser pointer will switch off automatically if too much time is taken between the steps
above. If this occurs, simply press the MEAS button to switch the Laser pointer back ON and then
continue following the steps.

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Volume Calculation
The DT200 allows the user to compute room Volume.
1. Press the MEAS button to switch the meter ON. Wait several seconds and the Laser pointer
will automatically switch ON.
2. Press the button firmly twice (allow a second or so between presses).
3. A cube shape will appear with its Length side flashing indicating that a Length
measurement is to be taken.
4. Press MEAS to take the room Length measurement.
5. The cube’s Width side will now be flashing indicating that a Width measurement is to be
taken.
6. Press MEAS to switch the Laser pointer ON again.
7. Press MEAS again to take the room Width measurement.
8. The cube’s Height side will now be flashing indicating that a Height measurement is to be
taken.
9. Press MEAS to switch the Laser pointer ON again.
10. Press MEAS to take the room Height measurement.
11. Lines 1, 2, and 3 will now show the Length, Width, and Area (in ft3 or m3) respectively. Note that
the individual Height measurement is NOT displayed.
Indirect Measurements (Using Two Measurements)
The DT200 can measure the vertical height from Point 1 to Point 2 with the operator taking the
measurement from Point X. This is accomplished using two measurements.
1. Press the MEAS button to switch the meter ON.
2. Press the button once. Wait several seconds and the Laser pointer will automatically
switch ON.
3. A right triangle shape will appear with its diagonal line flashing.
4. From exactly Point X, aim the instrument at Point 1 and press MEAS. One reading is now
complete and the bottom line of the right triangle will begin flashing.
5. From Point X, align the meter as horizontal as possible and aim for Point 2 and then press
MEAS. The laser pointer will switch ON.
6. Press MEAS again to take the second measurement.
7. The second measurement is now complete.The lower display line indicates the vertical
distance from Point 1 to Point 2.
X
1
2

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Indirect Measurements (Using Three Measurements)
The DT200 can measure height in two segments by taking three measurements. The operator
stands at Point X. The first measurement is Point X to 1, the second measurement is a horizontal
line from Point X to 2, and the third measurement is from Point X to 3.
1. Press the MEAS button to switch the meter ON. Wait several seconds and the Laser pointer
will switch ON.
2. Press the button two times.
3. The triangle icon will appear with its bottom diagonal line flashing.
4. From Point X aim the instrument at Point 1 and press MEAS. One reading is now complete
and the middle line of the triangle will begin flashing.
5. Press MEAS again to turn on the laser pointer to prepare for the next measurement.
6. From Point X, aim the instrument horizontally at a Point 2 and press MEAS. The second
reading is now complete and the top diagonal line of the triangle will begin flashing.
7. Press MEAS to turn on the laser pointer and prepare for the third measurement.
8. From Point X, aim the instrument at Point 3 and press MEAS. The third measurement is now
complete.
9. The distance from Point 1 to Point 3 will now be indicated on the bottom display line.
X
1
2
3

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Storing and Recalling Readings
The DT200 stores up to twenty (10) readings in memory for later recall.
1. Take a reading as previously described.
2. With the reading displayed, press the button.
3. The reading will be stored in location 1.
4. Take another reading press the store button. This new reading will be stored in location 1 and
the previous reading from location 1 will be moved to location 2.
5. When all twenty locations have been filled the meter begins overwriting the existing readings.
6. The memory location number is indicated on the upper left hand area of the display (1 to 20).
7. Use the + and – bottons to scroll through the the stored readings.
8. To clear all readings, enter the memory mode using the Memory button and then press
and hold the CLR and the Memory buttons until the displayed memory location reading value
switches to zeros.

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Maintenance
WARNING: Do not operate the meter until the battery compartment cover is in place and fastened
securely.
This instrument is designed to provide years of dependable service, if the following care instructions
are performed:
1. Keep the meter dry and free from dust.
2. Use and store the meter in nominal temperature conditions. Temperature extremes can
shorten the life of the electronic parts and distort or melt plastic parts.
3. Handle the meter carefully and avoid shock and vibration. Dropping the meter may
damage the electronic parts or the case.
4. Keep the meter clean. Wipe the case occasionally with a damp cloth. DO NOT use chemicals,
cleaning solvents, or detergents.
5. Use only fresh batteries of the correct type. Remove old or weak batteries so they do not
leak and damage the unit.
6. If the meter is to be stored for long periods, the batteries should be stored separately to
prevent damage to the unit.
Battery Installation/Replacement
When the low battery symbol appears on the display or when the display does not switch ON,
replace the two (2) ‘AAA’ batteries.
1. Switch the instrument off before replacing the batteries.
2. Remove the rear battery compartment cover by sliding the grooved latch on the meter bottom
toward the rear of the meter.
3. Replace the two (2) ‘AAA’ batteries observing polarity.
4. Replace the battery compartment cover.
5.
You, as the end user, are legally bound (Battery ordinance) to return all used batteries
and accumulators; disposal in the household garbage is prohibited!
You can hand over your used batteries / accumulators at collection points in your
community or wherever batteries / accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Display Error Codes
204 – Calculation Error (Retry the procedure)
208 – Received signal too weak (Use target plate)
209 – Received signal too strong (Target too reflective, use target plate)
252 – High Temperature (Cool down the instrument)
253 – Low Temperature (Warm up the instrument)
255 – Hardware error (Return the instrument for service)
Wrench icon – Hardware error (Return the instrument for service)

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Specifications
General Specifications
Laser diode Class 2 red laser (wavelength: 635nm)
Battery Two (2) ‘AAA’ alkaline batteries
Dust/Splash Proof IP 54
Operating conditions 32 to 104°F (0 to 40°C)
Storage conditions 14 to 140°F (-10 to 60°C)
Dimensions 4.5 x 1.9 x 1.1” (115 x 48 x 28mm)
Weight 5.3 oz. (150g)
Recommended use For indoor use only
Range Specifications
Distance Range 0.1 to 35m (4” to 115’)
Resolution 0.001 inches, feet, or meters
Accuracy ±2mm (± 0.08”)
Displayed Calculation Ranges
Length 99’ 11” (99.99m)
Area 999.99 sq. ft. (999.99m2)
Volume 999.99 cu. ft. (999.99m3)
Copyright ©2012 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
www.extech.com