HT D40 User Manual

 Copyright HT ITALIA 2013 Release EN 1.00 - 09/09/2013

ENGLISH

User manual

DM40

EN - 1

Table of contents

1. PRECAUTION AND SAFETY MEASURES………………… 2

2. PREPARATION FOR USE……………………………………. 4

2.1. Initial checks ................................................................................ 4

2.2. Instrument power supply ............................................................. 4

2.3. Storage ........................................................................................ 4

3. INSTRUMENT DESCRIPTION……………………………….. 5

3.1. Description of the controls ........................................................... 5

3.2. Display description ...................................................................... 6

3.3. General description of the instrument ......................................... 7

4. OPERATING INSTRUCTIONS……………………………….. 8

4.1. Initial operations and settings ...................................................... 8

4.2. Setting of measuring reference ................................................... 8

4.3. Distance measurement ............................................................... 9

4.4. Continuous distance measurement ............................................. 9

4.5. Additions / subtractions of measures ........................................ 10

4.6. Area measurement .................................................................... 11

4.7. Volume measurement ............................................................... 12

4.8. Indirect 2-point measurement .................................................... 13

4.9. Indirect 3-point measurement .................................................... 14

4.10. Operations with the memory ..................................................... 15

5. MEASURING CONDITIONS………………………………… 16

6. REPLACING INTERNAL BATTERIES……………………... 16

7. ERROR MESSAGES ON THE DISPLAY………………….. 17

8. TECHNICAL SPECIFICATIONS……………………………. 18

8.1. Technical characteristics ........................................................... 18

8.2. Reference standards ................................................................. 18

9. ACCESSORIES PROVIDED………………………………... 18

10.SERVICE………………………………………………………. 19

10.1. Warranty conditions ................................................................... 19

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1. PRECAUTION AND SAFETY MEASURES

The instrument has been designed in compliance with
the directives relevant to electronic measuring
instruments. For your safety and in order to prevent
damaging the instrument, please carefully follow the
procedures described in this manual and read all notes

preceded by the symbol

with the utmost attention.

CAUTION

In case the instrument is used in a way
different from the one described in this
user manual, this could result in a
failure of the protections the instrument
is provided with.

CAUTION

When this symbol is displayed, the
instrument is not able to emit a laser
pointer. Always prevent the laser

from radiating to your eyes, in order
to prevent any injury. Class II laser

device compliant with EN 60825-1

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In this manual, and on the instrument, the following
symbols are used:

Warning: observe the instructions given in
this manual; improper use could damage
the instrument or its components

Warning: always prevent the
laser from radiating to your eyes,
in order to prevent any injury

The instrument and its
accessories must be collected
separately and correctly
disposed of in the appropriate
containers

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2. PREPARATION FOR USE

2.1. Initial checks

Before shipping, the instrument has been checked
from an electric as well as mechanical point of view.
All possible precautions have been taken so that it is
delivered undamaged.

However, we recommend generally checking the
instrument in order to detect possible damage suffered
during transport. In case anomalies are found,
immediately contact the forwarding agent.

We also recommend checking that the packaging
contains all components indicated in § 9. In case of
discrepancy, please contact the Dealer.
In case the instrument should be returned, please
follow the instructions given in § 10.1

2.2. Instrument power supply

The instrument is supplied with two 1.5V AAA LR03
batteries, included in the package. Battery life equals

about 5000 measurements. The “

“ symbol
flashes on the display when the battery is flat. Replace
the battery by following the instructions given in § 6

2.3. Storage

In order to guarantee precise measurement, after a
long storage time under extreme environmental
conditions, wait for the instrument to come back to
normal condition (see § 8.1). Given its simplicity, the
instrument does not need any periodic calibration.

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3. INSTRUMENT DESCRIPTION

3.1. Description of the controls

Fig. 1: Instrument description

Caption Description

1 ON/MEAS key
2 Area/Volume key
3 Key for indirect distance measurement

4

Key for single/continuous distance

measurement
5 “+” key
6 “-” key
7 Key for saving measurement results
8 Reference setting key
9 Backlight/Measuring unit key

10 OFF/CLR key

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3.2. Display description

Fig. 2: Description of the symbols at display

Caption Description

1 Active laser
2 Front reference
3 Rear reference

4

Type of measurement:

 Area measurement

 Volume measurement

 Indirect 2-point measurement

 Indirect 3-point measurement
5 Single distance measurement
6 Battery charge level
7 Memory for partial data saving
8 Instrument error message

9

Max and Min measurements in
continuous mode

10 First measurement partial value display
11

Second measurement partial value
display

12

Last measurement value display and
result

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3.3. General description of the instrument

DM40 has the following functions:
 Direct measurement of distances expressed in

m/in/ft and ft+in

 Measurement of area and volume
 Indirect 2- and 3-point distance measurement

(Pitagora)

 Distance measurement in continuous mode
 Sum/difference of measured distance values
 Setting of measuring reference
 Activation of the laser pointer for measurement
 Partial operations with use of internal memory (max

20 locations)

 Display backlight
The model is provided with a comfortable membrane

keyboard with 10 function keys and a class II laser
pointer for a precise definition of the application point.

The measurement of distance between two points
(with a measuring range from 5cm to 40m) is carried
out by reflection of the laser light from the surface hit
to the receiving sensor located in the upper part of the
instrument.

Measurement can be influenced by the brightness of
the environment in which it is performed and by the
type of surface hit by the laser pointer.

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4. OPERATING INSTRUCTIONS

4.1. Initial operations and settings

 Press the

key to switch on the instrument and

the laser pointer. Press and hold the

key to

switch off the in strument.

 Press the

key to clear (CLR) the last datum

shown on the display.

 Press the

key to see the saved distance values.

Press the

and keys at the same time to
delete the temporary memory's content. The value
“0” is shown on the display.

 Press the

key to activate/deactivate the

backlig ht of the display.

 Press and hold the

key to activate the section
for setting distance measuring units. Cyclically press
the key to select the options: “m”, “ft”, “in” and
“ft+in”

4.2. Setting of measuring reference

In order to perform correct measurements, it is
important to define beforehand the measuring

reference on the instrument by pressing the

key.

Possible options are (see the following figure):
 Top  measurement is carried out by the upper

part of the instrument.

 Bottom  measurement is carried out by the lower

part of the instrument and therefore also the whole
instrument length is considered (default condition)

“Bottom” reference “Top” reference

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4.3. Distance measurement

1. With the instrument in stand-by, press the

key

to activate the laser pointer

2. Use the laser pointer to precisely determine the
measuring point, keeping the instrument as
perpendicular as possible with respect to the
surface of the object to be measured

3. Press the

key again for measuring. The value
will be displayed in the selected measuring unit
(see § 4.1) and the result will be automatically
saved in the memory area

4.4. Continuous distance measurement

Upon start-up, the instrument is set to normal mode or
measuring the distance between 2 points. Continuous
measuring mode allows for a dynamic management of
the distance and the display of the maximum and
minimum measurement values.

1. With the instrument in stand-by, press the key
to select the desired type of reference (see § 4.2)

2. Press and hold the

key to activate the
continuous measuring mode. The indications “Min”
and “Max” are shown on partial displays

3. Press the

or OFF/CLR key to stop continuous
measurement. The function is automatically
stopped after approx. 20s

4. The minimum and maximum value of distance are
shown in the partial displays while continuous
measurement is shown dynamically when moving
the instrument (see Fig. 3) in the resulting display

Fig. 3: Examples of continuous measurements

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5. Press the

key to exit the continuous measuring

mode and go back to normal mode

In Fig. 4 some applications of continuous
measurement are indicated

Fig. 4: Applications of continuous measurement

4.5. Additions / subtractions of measures

When measuring distance, it is possible to use the
following functions:

Key Function

The subsequent measure is added to
the previous one. The result of the sum
is shown on the resulting display.

The subsequent measure is subtracted
from the previous one. The result of the
difference is shown on the resulting
display.

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4.6. Area measurement

This measurement allows calculating the area of
surfaces expressed in m

2

, in2 or ft2

1. With the instrument in stand-by, press the key
to select the desired type of reference (see § 4.2)

2. Press the

key to enter the Area/Volume

measuring section. The symbol “

“ appears on

the display with side “1” flashing

3. Press the

key to perform the first
measurement (length) of the surface concerned
(see Fig. 5). The corresponding value appears on
the first partial display. The symbol “

“ appears

on the display with side “2” flashing

4. Press the

key again to perform the second
measurement (width) of the surface concerned (see
Fig. 5). The corresponding value appears on the
second partial display, while the (up-to-date) total
value of the area appears on the resulting display

5. Measuring result is automatically saved in the
instrument's memory

Fig. 5: Example of area measurement

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4.7. Volume measurement

This measurement allows calculating the volume of
solids expressed in m

3

, in2 or ft3

1. With the instrument in stand-by, press the

key

to select the desired type of reference (see § 4.2)

2. Press the

key twice to enter the Area/Volume

measuring section. The symbol “

“ appears on

the display with side “higher” flashing

3. Press the

key to perform the first
measurement (length) of the surface (see Fig. 6).
The corresponding value appears on the first partial

display. The symbol “

“ appears on the display

with side “1” flashing

4. Press the

key again to perform the second
measurement (width) of the surface (see Fig. 6).
The corresponding value appears on the second
partial display. The value of the corresponding area

is shown in the resulting display. The symbol “

“

appears on the display with side “2” flashing

5. Press the

key again to perform the third
measurement (height) (see Fig. 6). The total value
of volume is shown in the main resulting display

6. Measuring result is automatically saved in the
instrument's memory

Fig. 6: Example of volume measurement

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4.8. Indirect 2-point measurement

Indirect measurement allows precisely evaluating a
distance between two points on a vertical wall (height)
exploiting the mathematical principle of the
Pythagorean theorem. For accurate measures we
recommend using a tripod.

1. With the instrument in stand-by, press the

key

to select the desired type of reference (see § 4.2)

2. Press the

key to enter the indirect 2-point

measuring section. The symbol “

“ appears on the

display with side “1” flashing

3. Position the instrument in the highest point (1) of
measurement (see Fig. 7) and press the

key to
measure. The result appears on the first partial
display. The symbol “

“ appears on the display

with side “2” flashing

4. Position the instrument as horizontally as possible
(2) (see F ig. 7) and pr ess the

key to measure.

The result appears on the second partial display

5. The final value of the result (obtained as

22

)2()1( 

)

is shown in the resulting display

6. Measuring result is automatically saved in the
instrument's memory

Fig. 7: Indirect 2-point measurement

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4.9. Indirect 3-point measurement

1. With the instrument in stand-by, press the

key

to select the desired type of reference (see § 4.2)

2. Press the

key twice to enter the indirect 3-point

measuring section. The symbol “

“ appears on the
display with side “1” flashing. The distance to be
measured flashes on the symbol

3. Position the instrument in the lowest point (1) of
measurement (see Fig. 8) and press the

key.

The result appears on the first partial display. The
symbol “

“ appears on the display with side “2”

flashing

4. Position the instrument as horizontally as possible
(2) (see F ig. 8) and pr ess the

key to measure.

The result appears on the second partial display.
The symbol “

“ appears on the display with side

“3” flashing

5. Position the instrument in the highest point (3) of
measurement (see Fig. 8) and press the

key to

measure

6. The final value of the result obtained with the
combination of previous measures is shown in the
resulting display

7. Measuring result is automatically saved in the
instrument's memory

Fig. 8: Examples of indirect 3-point measurements

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4.10. Operations with the memory

The instrument is provided with a memory section in
which it is possible to recall measuring results. It is
possible to save up to 20 measurements, shown in
reverse order.

 Use the

or keys for internal navigation.

 Press the

and keys at the same time to

delete the memory's content

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5. MEASURING CONDITIONS

Measuring range

The instrument's measuring range is 40m. At night,
under poor visibility conditions or if the surface to be
measured is in shadow, the measuring range can be
reduced. To prevent this, carry out measurements
during the day or use luminous plates when the object
to be measured has poor reflecting properties.
Object surface
The instrument can give errors when measurements
are carried out on colourless liquids (e.g. water),
transparent glass, polystyrene, very polished or half­permeable surfaces because of the deviation of the
laser beam. Non-reflecting surfaces may cause delays
when measuring.
Maintenance
Do not immerse the instrument in water. To clean the
instrument, use a soft cloth moist with neutral
detergent

6. REPLACING INTERNAL BATTERIES

The instrument is supplied by 2x1.5V AAA LR03
alkaline batteries. When the symbol “

“ flashes
on the display, it is necessary to replace the batteries.
Proceed as follows:

1. Loosen the battery compartment cover fastening

screw and remove the cover (see Fig. 9)

2. Remove the batteries and insert the same number

of batteries of the same type, respecting the correct
polarity. Only use alkaline batteries

3. Restore the battery compartment cover and fasten

the relevant screw

Fig. 9: Replacement of the internal battery

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7. ERROR MESSAGES ON THE DISPLAY

Code Description Solution

204 Calculation error

Press and repeat
procedure

208

Weak signal reflection,
measuring time too
long, distance > 40m or
<5cm

Carry out measurement
on an appropriate
surface

255 Hardware error

Turn off the instrument
and turn it on again
several times. Contact
Customer Service if the
message is displayed
again.

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8. TECHNICAL SPECIFICATIONS

8.1. Technical characteristics

Measuring range (*):

0.05  40m (0.2in131ft)
Resolution: 0.001m (0.001ft)
Accuracy (@10m):

1.5mm (**)

Laser pointer: 635nm, Class II, <1mW
Display:

LCD, 5 digits with
backlight

Power supply: 2x1.5V type AAA LR03
Duration: up to 5000 measurements
Operating temperature:

0°C  40°C

Storage temperature:

-10°  60°C
Auto power off: 30s (laser), 3min (DM40)
Size (LxWxH): 110 x 48 x 28mm

Weight (batteries
included):

135g

Mechanical protection: IP54

(*) Measuring range and accuracy depend on the correct reflection of the
laser beam from the surface of the ob ject to the ins trument's sensor and on
the brightness of the environment in which tests are performed.
(**) Under favourable conditions (optimum object surface, room
temperature). Under unfavourable conditions (intense sunshine, poor
reflective properties of the object, high variations in temperature) the
resolution in measurements >10m may be higher by ±0.15mm/m
(±0.0018in/ft)

8.2. Reference standards

EMC:

IEC/EN61326-1 :2006
IEC/EN61326-2-2 :2006
IEC/EN61326-1 :2005
IEC/EN61326-2-2 :2005
2004/108/EC EMC directive

Laser : IEC/EN60825-1

9. ACCESSORIES PROVIDED

 Carrying bag
 Non-slip strap
 Batteries
 User manual

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10. SERVICE

10.1. Warranty conditions

This instrument is warranted against any material or
manufacturing defect, in compliance with the general
sales conditions. During the warranty period, the
manufacturer reserves the right to repair or replace the
product.

Should the instrument be returned to the After-sales
Service or to a Dealer, transport will be at the
Customers charge. A report will always be enclosed to
a shipment, stating the reasons for the products return.
The manufacturer declines any responsibility for injury
to people or damage to property.

The warranty shall not apply in the following cases:
 Repair and/or replacement of accessories and

battery (not covered by warranty)

 Repairs that may become necessary as a

consequence of improper use.

 Repairs that may become necessary as a

consequence of improper packaging.

 Repairs which may become necessary as a

consequence of interventions performed by
unauthorized personnel.

 Modifications to the instrument performed without

the manufacturers explicit authorization.

 Use not provided for in the instruments

specif ications or in the instruction manua l.

The content of this manual cannot be reproduced in
any form without the manufacturer’s authoriza tion