Megger DLRO2 Specifications
DLRO2
Ducter™ Low Resistance Ohmmeter 2 Amp
New ‘Difference Meter’ for quick
data comparisons
Use long leads at 1 A without compromising
test speed
Safely test the resistance of inductive loads at 1 A
Up to 600 V active protection against inadvertent
live connections without blowing a fuse
Ideal for outdoor use with protection against dust
and moisture to IP54
Industry standard safety rated at
CATIII 600 V/CATIV 300
DESCRIPTION
The DLRO2 is a tough, hand-held 2 Amp low resistance
ohmmeter. It’s designed to provide fast, accurate,
repeatable measurements, even in electrically noisy
locations. The DLRO2 is the latest in a long line of
instruments to proudly display the Ducter™ brand, the
Ducter™ testers being as well-known and relied upon as
Megger insulation resistance testers.
For the utility or industrial user, a high level of safety
is provided with a CATIII 600 V/CATIV 300 V rating to
IEC61010. In addition, the instrument can protect itself
from inadvertent connections to up to 600 V without
blowing a fuse, thereby avoiding essential time lost due to
repairs or finding a replacement fuse.
When working outside, the IP54 rating ensures that neither
rain nor dust will prevent testing.
The DLRO2 measures low resistance values across a wide
range of applications, from railways and aircraft to the
resistance of industry components.
Applications requiring long test leads are not a problem for
the DLRO2 as it has a dedicated long lead test to optimize
the output. The long test lead function is able to provide
up to 1 A of test current into 4 ohms resistance. This makes
the DLRO2, with its optional cable reel test leads, ideal
for testing wind turbine and avionic lightning protection
applications.
To allow testing of smaller inductive loads, the DLRO2 can
apply 2 A for at least 15 seconds, made possible by the
high-capacity built-in rechargeable batteries, together with
a separate inductive load function. The batteries can be fully
recharged in 2.5 hours, minimizing down time.
Note: The DLRO2 is not ATEX/intrinsically safe rated and
must not be used in explosive gas environments.
FEATURES
New Difference Meter
The DLRO2 is also equipped with a new innovative
feature called a ‘difference’ meter. This allows repetitive
measurements to be easily compared with an initial
reference measurement. The difference meter translates
percentage difference to a needle/pointer movement to
make it visually easy to see change.
New reference measurements can be set at the
push of a button.
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DLRO2 color display with new Difference Meter
Key to Difference Meter screen:
1 Difference Meter scale
2 Previous result markers in red indicates noise was present
3 Reference measurement
4 Previous result markers
5 Electrical noise warning
6 Percentage difference between current measurement and
initial reference measurement
DLRO2
Ducter™ Low Resistance Ohmmeter 2 Amp
DLRO2 keeps you testing and produces reliable
measurements
To ensure the DLRO2 is always ready to test, the supplied
fitted as standard AA rechargeable NiMH batteries can
easily be swapped for non-rechargeable standard AA
alkaline batteries to keep you testing.
The DLRO2 provides 1% accuracy with a focus on
repeatability making it ideal for repeated quality tests in
production environments.
FEATURES AND BENEFITS
n Easily select functions using the rotary dial.
n Option to run the test in bidirectional mode or in
unidirectional mode to save time and battery power.
n The ability to view 3 results on the screen at any time
makes it ideal for 3-phase systems.
n Overcome the effects of standing EMF voltages using
the bidirectional test mode. Forward and reverse
results can be viewed on the secondary display.
n For stability of results, the instrument will warn you
when electrical noise, or noise from poor clip/probe
connections, is present.
n Keeps testing as long as you can, with as many as
500 x 2 A - 3 second tests from a full charge.
n Supplied with compact CATIII 600 V/CATIV 300 V
rated kelvin clip test leads.
EXAMPLE APPLICATIONS
n Aviation – lightning protection testing measuring mΩ
resistance between receptors, wing tip to wing tip
etc., using long test leads. Optional long cable reel
test leads are available, can be used for assembly of
components, interconnection of equipment, repair
and maintenance.
n Wind turbines – lightning protection, measuring mΩ
resistance between wing tip to ground connection at
base using long test leads. Optional long cable reel
test leads are available.
n Rail, tram and underground – rolling stock and
infrastructure, track high current joints, signalling
systems.
n Marine – power wiring systems, protection systems,
ship-to-shore bonding, cathode protection system
testing and cable laying applications.
n Oil and gas pipelines – bonding between welded
joints and grounding systems.
n Automotive and EV – battery connections, weld
quality, crimped connections quality, assembly robot
welding cables.
n Cable manufacturers – quality control, cable length.
n Component manufacturers – quality control.
n Space exploration and engineering – structural metal
to metal, ground network metal to metal, carbon
fiber to metal, carbon fiber to carbon fiber.
n Data centers – during electrical installation of main
panel, generator and UPS systems. Verification of
protective device contact resistance, busbar parallel
feeds, busbar lapped joints, optimum resistance over
torque and cable lug to busbar connections. During
maintenance using trending data for all aspects of the
above, verification after repair.
n Medical hand-held opportunity – grounding and
bonding systems for protection against microshock
and macroshock.
n Panel/switchgear manufacturers – end of production
line testing, site commissioning, maintenance and
fault finding.
n Robotics – wiring systems and connections which
are subject to stress/movement/vibration, bonding
of component parts to minimize static, grounding of
machine, welding leads of robot spot welder.
n Electrical infrastructure – cable resistance from one
end, cable length, identification of parallel supplies
while connected, cable to lug to connection fault
finding. Checking assembled connections main supply
cables and panels, switchgear and protective devices,
UPS and changeover panels, interlinking busbars,
interlinking cables, distribution and PDU boards,
lightning protection systems, final circuits.
Test modes / options:
The DLRO2 has three main test modes
n Normal resistance mode (μΩ)
n Fast/long test leads test mode (mΩ)
n Inductive resistance mode (μΩ)
Normal Resistance mode: gives the most flexibility. The
user can set any maximum test current range up to 2 A
and the instrument will auto range to suit the measured
resistance up to that value. Useful if the test piece has
a limit to the current it can withstand. The user has full
control of the instrument’s test features which is suitable
for many applications, as listed above.
Fast/long test leads mode: only has one user option,
which is manual/auto. ‘Manual’ starts the test when the
TEST button is pressed, ‘auto’ starts the test automatically
when the instrument detects continuity. In this mode,
the instrument settings are optimized for speed and, if
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