Megger MLDM50 User manual

MLM50
Laser Distance Meter
USER MANUAL

1. Introduction
The Megger MLM50 Laser Distance Meter is a compact, easy to use meter designed for indoor and outdoor use. It
allows the user to make fast, reliable distance measurements, as well as add and subtract measured values and make
automatic calculations for area and volume.
For your own safety and to get the maximum benefit from your instrument, please ensure that you read and
understand the following safety warnings and instructions before using the instrument.
This user guide describes the operation and functions of the MLM50 Laser Distance Meter.
The meter should only be used for the purpose intended: measuring distance and computing values of area and
volume.
2. Safety Warnings
Safety Warnings and Precautions must be read and understood before the instrument is used. They must be observed
during use.
THE INSTRUMENT MUST BE USED ONLY BY SUITABLY TRAINED AND COMPETENT PERSONS.
Laser Classification
This product produces a visible laser beam from the front of the instrument.
Laser Class 2 products:
Do not stare into the laser beam or direct it towards other people. Looking into the laser beam may be hazardous and
cause permanent damage to the eyes. Measurement should be made either above or below eye level.
Symbols as marked on the instrument
cConforms to EU directives
Conforms to UKCA directives
Do not discard this product or throw away
3. The Meter Description
Keypad
1 - ON/MEAS button
2 - CLR/OFF button
3 - MEM/Reference button
4 - Function/Unit Button
www.megger.com
2
MLM50 Laser Distance Meter

LCD Display
1 – Laser active
2 – Reference level (front)
3 – Reference level (rear)
4 – Battery Status
5 – Intermediate line 1
6 – Intermediate line 2
7 – Summary line
4. Operation and Settings
On/Off/Auto Measurement
Switches on the instrument and measurement laser.
Press and hold this button for 1 second to initiate automatic measurement mode.
Clear Button
The last action is cancelled, or the data display is cleared. If in History storage mode, by pressing the Storage and
Clear button simultaneously, you will clear all stored data in the memory. Press and hold this button to switch off the
instrument. The instrument switches off automatically after three minutes of inactivity to save battery life.
Reference Level Setting
www.megger.com 3
MLM50 Laser Distance Meter

The default measurement reference is taken from the rear of the instrument. Long press this button prior to taking
a measurement to switch between the front and rear edge. A special beep sounds whenever the reference setting is
changed. When powering up the meter, the measurement reference automatically returns to the default setting (rear
reference).
Measurement Unit Setting
Hold down this button to cycle through the available measurement units. The following unit can be set:
Distance Area Volume
1 0.000 m 0.000 m² 0.000 m³
2 0.0 in 0.000 ft² 0.000 ft³
3 0 1/16 in 0.000 ft² 0.000 ft³
4 0.000 ft 0.000 ft² 0.000 ft³
5 0’00” 1/16 0.000 ft² 0.000 ft³
5. Measuring
Single Distance Measurement
Press to activate the laser
Press again to trigger the distance measurement. The measured value is displayed immediately.
Continuous & Max and Min Measurement
The continuous measurement updates the measured value continuously in the third (summary) line of the display.
The corresponding minimum and maximum values are displayed dynamically in the first and second lines respectively,
updated every 0.5 seconds.
For continuous measurement, hold down the button until the instrument beeps. Press either the MEAS or CLR/OFF
button to stop the function. The function is terminated automatically after 100 continuous measurements.
www.megger.com
4
MLM50 Laser Distance Meter

6. Functions
Area Measurement
Pressing the button once will start the area measurement function.
Press the button to take the first length measurement (e.g. length).
Press the again to take the second length measurement (e.g. width).
The result of the area measurement is displayed in the third summary line of the display. The two individually measured
values are displayed in lines 1 and 2.
Volume Measurement
By pushing the Unit button twice, it will start the volume measurement function.
Press the button to take the first length measurement (e.g. length).
Press the again to take the second length measurement (e.g. width).
The result of the area measurement from the values already measured is displayed in the summary line.
Pressing takes the third distance measurement (e.g. height). The value is displayed in the second line.
The resulting volume measurement is displayed in the third summary line. The last two measured values are displayed in
lines 1 and 2.
Historical Storage
The previous 20 measurements or calculated results can be recalled on the display, in reverse order (newest first). To
enter memory mode, quick press this button to cycle through the stored results. The memory location is shown at the
top of the display.
You can clear all stored records by pressing MEM and CLR buttons simultaneously when in historical storage mode.
6. Technical Specifications
Range 0.05 to 50 m (0.2 to 164 ft) *
Measuring accuracy up to10m Typically: ±1.5 mm (±1/16 in)**
Standard deviation 2 σ
Measuring units m, in, ft
Laser Class Class II
Laser Type 650 nm, <1mW
Smallest unit displayed 1mm
Area, Volume Calculations √
Built-in spirit level √
Continuous Measurement √
Min/Max Distance Tracking √
Backlit display √
www.megger.com 5
MLM50 Laser Distance Meter

Soft-Touch buttons √
Dust Protect/Splash proof IP54
History measurement records 20
Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -10°C to 60°C (14°F to 140°F)
Batteries 2 x AAA 1.5V
Battery Life up to 5,000 measurements
Auto laser switch-off after 30 seconds
Auto instrument switch-off after 3 min
Dimension 135 x 33 x 24mm
Weight 80g
* Use a target plate to increase the measurement range during daylight or if the target has poor reflective properties!
** in favorable conditions (good target surface properties, room temperature) up to 10 m (33 ft). In unfavorable
conditions, such as intense sunshine, poorly reflecting target surface or high temperature variations, the deviation in
distances above 10 m (33 ft) can increase by ± 0.15 mm/m (± 0.0018 in/ft).
Product manufactured in China
7. Inserting or Replacing Batteries
i) Remove the rear battery compartment lid.
ii) Insert 2 x AA batteries, observing their correct polarity.
iii) Replace the rear battery compartment lid.
Replace the batteries when the symbol flashes permanently in the display.
It is recommended to use alkaline batteries only.
Batteries should be removed prior to any long period of non-use.
8. Error Codes
Code Cause Corrective measure
208 Received signal too weak. Measurement
time too long. Distance >50M
Use target plate.
252 Temperature too high Cool instrument down
253 Temperature too low Warm up instrument
255 Hardware error Switch on/off the device several times.
If the error persists, please contact your
local service center.
9. Labelling
www.megger.com
6
MLM50 Laser Distance Meter

10. Measuring Conditions
Measuring Range
The range is limited to 50m.
Use a target plate to increase the measurement range during daylight or if the target has poor reflective properties.
Target Surfaces
Measuring errors can occur when measuring toward colorless liquids (e.g. water) and clear glass, Styrofoam or similar
semi-permeable surfaces. Aiming at high gloss surfaces may deflect the laser beam and lead to measurement errors.
Against non-reflective and dark surfaces, the measuring time may increase.
Maintenance
Do not attempt to repair this meter. It contains no user serviceable parts. Repair or servicing should only be performed
by qualified personnel.
Cleaning
Should the MLM50 require cleaning, remove the batteries and wipe the instrument down with a damp cloth. Ensure
the meter is dry before reinserting batteries.
Never use a solvent based cleaner.
WEEE Directive
The crossed out wheeled bin symbol on the instrument is a reminder not to dispose of the product with general waste
at the end of life.
Megger is registered in the UK as a Producer of Electrical and Electronic equipment. The registration No is; WEE/
DJ2235XR.
Users of Megger products in the UK may dispose of them at the end of their useful life by contacting B2B Compliance
at www.b2bcompliance.org.uk or by telephone on 01691 676124.
Users of Megger products in other regions should contact their local Megger office or distributor.
Warranty (3 years)
This product is warranted to the original purchaser against defects in material and workmanship for three years from
the date of purchase. During this warranty, the manufacturer will either replace or repair the defective unit, subject to
verification of the defect or malfunction.
This warranty does not cover fuses, disposable batteries, or damage from abuse, neglect, accident, unauthorised repair,
alteration, contamination, or abnormal conditions of operation or handling.
Any implied warranties arising out of the sale of this product, including but not limited to implied warranties of
merchantability and fitness for a particular purpose, are limited to the above. The manufacturer shall not be liable for
loss of use of the instrument or other incidental or consequential damages, expenses, or economic loss, or for any claim
or claims for such damage, expense or economic loss. Some states or countries laws vary, so the above limitations or
exclusions may not apply to you.
Battery Disposal
The batteries in this product are classified as Portable Batteries under the Batteries Directive. Please contact either
Megger Ltd, your local Megger office or distributor for instructions on the safe disposal of these batteries. Megger is
registered in the UK as a producer of batteries. The registration number is BPRN01235.
For further information see www.megger.com
www.megger.com 7
MLM50 Laser Distance Meter

Manufacturing sites
Megger Limited
Archcliffe Road
Dover
Kent
CT17 9EN
ENGLAND
T. [phone]
F. [phone]
Megger GmbH
Weststraße 59
52074
Aachen
Germany
T. [phone]
E. [e-mail]
Megger USA - Valley Forge
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown
Pennsylvania, 19403
USA
T. 1-610 676 8500
F. 1-610-676-8610
The company reserves the right to change the specification or design without prior notice.
Megger is a registered trademark
The Bluetooth®word mark and logos are registered trademarks owned by Bluetooth SIG,
Inc and is used under licence.
Part No: MLM50_UG_en_V01
© Megger Limited 2021 www.megger.com
Megger USA - Dallas
4545 West Davis Street
Dallas
75211-3422
T. [phone]
F. [phone]
[e-mail]
Megger AB
Rinkebyvägen 19, Box 724,
SE-182 17
DANDERYD
T. 08 510 195 00
E. [e-mail]
Megger Baker
4812 McMurry Avenue
80525
USA
T. [phone]
E. [e-mail]