Extech Instruments DT40M User manual

USER MANUAL

Laser Distance Meter

MODELS DT40M, DT60M, and DT100M

DT40_60_100M-en-GB_v1.0 8/17

Contents

Introduction ..........................................................................................3

Safety Instructions .................................................................................3

Descriptions...........................................................................................4

Measurement Preparation ......................................................................6

Programming Menu ...............................................................................8

Distance Measurements .........................................................................8

Area Measurements .............................................................................10

Volume Measurements.........................................................................12

Indirect Measurements (Pythagorean) ...................................................13

Stakeout Function ................................................................................16

20-point Datalogger .............................................................................17

Maintenance .......................................................................................18

Display Error Codes ..............................................................................20

Specifications.......................................................................................20

DT40_60_100M-en-GB_v1.0 8/17

Introduction

Thank you for selecting the Extech Laser Distance Meter. This meter

measures distance up to 40m (131.2’) for DT40M, 60m (197’) for

DT60M, or 100m (328.1’) for DT100M and calculates Area, Volume,

and Indirect readings using the Pythagorean Theorem (a2+b2=c2). It

also includes a laser pointer and a stakeout feature. Please visit

www.extech.com for the latest version of this User Guide, Product

Updates, and Customer Support.

Safety Instructions

This meter has been designed for safe use, but must

be operated with caution.

Laser classification (Class 2)

The meter produces a visible Class 2 laser beam from

the top of the instrument.

WARNING: Do not directly view or point the laser at an eye. Do not

look directly into the beam using an optical aid such as binoculars. This

can create a hazard. 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.

Please read all safety instructions carefully before using this

instrument

Do not use this device in flammable or explosive environments

Do not use this device near aircraft or medical equipment

Do not use this device near strong electro-magnetic interference

Do not aim the meter directly into sunlight

Do not dis-assemble or modify the instrument

Do not store in areas of high temperature/humidity

Remove the batteries when storing the instrument for long periods

DT40_60_100M-en-GB_v1.0 8/17

Descriptions

Meter

1. LCD display area

2. Keypad

3. Level

4. Laser Pointer

5. Sensor Beam

Note: Battery compartment on back of meter

Display Description

1. Length measurement mode

2. Battery status

3. Datalogger icon and memory location (1~20)

4. Signal strength icons

5. Laser pointer default

mode

6. Edge Reference (from top

or bottom of meter)

7. Indirect measurements:

Single Pythagorean,

Double Pythagorean, and

Double Pythagorean

(partial height)

8. Stakeout mode

9. Area/Volume mode

10. Primary/summary display line

11. Auxiliary Display lines 1 (top), 2, and 3

12. Units of measure

DT40_60_100M-en-GB_v1.0 8/17

Keypad Description

Short press: Power ON

Short press: Laser ON (can be set to default ON)

Short press: Single distance measurement

Long press: Continuous measurement mode

Short press: Datalogger mode (press CLR to exit)

Long press: Open program menu

Short press: Clear display; Long press: Power OFF

Short press: Area/Volume mode

Long press to 1st beep: Stakeout mode

Indirect measurements

Press 1x: Single Pythagorean mode

Press 2x: Double Pythagorean mode

Press 3x: Double Pythagorean (partial height)

Add / Subtract keys

Short press: Measurement edge selection

Long press: Backlight ON/OFF

Short press: Select unit of measure

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Measurement Preparation

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. For distance measurements, this device performs best

indoors. If used outdoors, the range will be limited

depending on intensity of light and other environmental

factors.

4. Replace the battery if the battery icon flashes on the display

5. The meter will not measure through glass, liquid, or

Styrofoam

6. Inaccurate measurements may result from low battery,

measured distance exceeding specified range, and irregular

shaped objects near the target.

Range considerations

The range is limited to 40m (131.2’), 60m (197’), or 100m

(328.1’) depending on model. At night or dusk, if the target is in

shadow, the measuring range without target plate is increased.

Use a target plate to increase the range during daylight or if the

target has poor reflection properties. In unfavorable conditions

such as intense sunlight, poor reflective surfaces, or high

temperatures, distance readings over 10m (33’) can increase by

±0.15mm/m (±0.0018in/ft.).

Target surfaces

Measurement errors can occur when measuring toward colorless

liquids (e.g. water), dust free glass, Styrofoam or similar semi-

DT40_60_100M-en-GB_v1.0 8/17

permeable surfaces. Aiming at high gloss surfaces may deflect

the laser beam and lead to measurement errors. For non-

reflective and dark surfaces, the measuring time may increase.

Preparing for Measurements

1. Press the MEAS key to switch the meter ON.

2. You can elect either to have the Laser always ON or to have

the laser turn ON only when the MEAS key is pressed. Go to

the Programming Menu section of this manual for details.

3. The unit automatically switches OFF after three (3) minutes

of inactivity. Long press CLR to switch the unit OFF manually.

4. Press CLR to cancel the last action performed or clear the last

data displayed on the screen.

5. Press UNIT to change the unit of measure (ft = feet, in =

inches, m = meters.

6. Long press to turn the backlight on or off.

7. Short press the reference key to select the top edge or

bottom edge reference. See diagram below.

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. This is the

default mode.

DT40_60_100M-en-GB_v1.0 8/17

Programming Menu

1. Long press to open the programming menu

2. Use the MEAS button to step through the options

3. Use the (+) and (-) keys to make changes

4. Use the MEAS button to exit the menu

5. See table below for the program options

ON: OFF:

For distance measurements: Set Laser to

default ON/OFF. Use + key to select.

For all other measurements: Set Laser to

default ON/OFF. Use + key to select.

CAL. 0

Use +/- keys to offset display by ±7mm

bP. on/oFF

Use +/- keys to set beeper default ON/OFF

bL. On/oFF

Use +/-keys to set backlight default

ON/OFF

od. On/oFF

Unused mode

Distance Measurements

Single Distance Measurements

1. Momentarily press the MEASURE key to switch the meter ON;

Dashes (- - -) will appear on the display.

2. If the Laser point is already ON, go directly to step 3 below. If

the Laser point is not ON, press MEASURE to switch it ON.

3. Aim the meter and short press MEASURE to take a reading.

4. You can elect either to have the Laser always ON or to turn ON

only when MEASURE is pressed. Go to the Programming Menu

section of this manual for details.

DT40_60_100M-en-GB_v1.0 8/17

5. The reading will remain on the display until it is cleared with

the CLR key (short press) or until the meter is powered OFF.

Continuous Distance Measurements (with MAX-MIN)

This mode of operation is useful for determining the shortest

and longest distances from a given point. The meter can be

moved to various targets while the primary display (bottom)

updates with each new measurement. The MIN and MAX values

are displayed dynamically in auxiliary displays above the primary

display.

1. Press the MEASURE key to switch the meter ON.

2. Press and hold MEASURE for 3 seconds to begin a continuous

measurement session. The laser pointer will stay ON in

continuous mode.

3. The meter will beep with each new automatic measurement

update (approx. every one half second).

4. The MIN reading will be indicated (example below, left) and

will update each time a lower reading (< displayed MIN

reading) is encountered.

5. The MAX reading (example below, right) will be indicated and

will update each time a higher reading is encountered.

6. The actual reading will be indicated on the primary display.

DT40_60_100M-en-GB_v1.0 8/17

7. To stop measuring, short press MEASURE. Use the CLR key to

delete measurement displays.

8. Note that the meter exits to the normal mode of operation

after approx. 100 measurements in continuous mode.

Adding / Subtracting Distance Measurements

To display the sum or difference of two distance measurements:

1. Press the MEASURE key to switch the meter ON. Press

MEASURE to turn Laser ON, if it is not already ON.

2. Press MEASURE to take the first reading. The reading appears

on the primary display line (bottom).

3. Press the plus (+) or minus (-) key. The first reading will move

to auxiliary display line 2.

4. The plus or minus sign will appear on auxiliary display line 3.

5. Press MEASURE to turn Laser ON, if it is not already ON.

6. Press MEASURE to take the second reading. The second

reading appears on auxiliary display line 3.

7. Read the sum or difference of the two readings on the

primary display line.

8. Press CLR to cancel the last step or press MEASURE to move

the result (now shown in the primary display) to auxiliary

display line 2, for additional adding/subtracting work.

9. Press CLR to exit this mode or turn the meter OFF.

Area Measurements

Area Calculations

Computing the area of a room:

1. Press the MEASURE key to turn the meter ON.

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