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 FEATURES
The DLRO2 is a tough, hand-held 2 Amp low resistance New Difference Meter
ohmmeter. It’s designed to provide fast, accurate, The DLRO2 is also equipped with a new innovative
repeatable measurements, even in electrically noisy feature called a ‘difference’ meter. This allows repetitive
locations. The DLRO2 is the latest in a long line of
measurements to be easily compared with an initial
instruments to proudly display the Ducter™ brand, the
reference measurement. The difference meter translates
Ducter™ testers being as well-known and relied upon as
Megger insulation resistance testers. percentage difference to a needle/pointer movement to
For the utility or industrial user, a high level of safety make it visually easy to see change.
is provided with a CATIII 600 V/CATIV 300 V rating to New reference measurements can be set at the
IEC61010. In addition, the instrument can protect itself push of a button.
from inadvertent connections to up to 600 V without 1 2 3 4
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 6 5
applications. DLRO2 color display with new Difference Meter
To allow testing of smaller inductive loads, the DLRO2 can Key to Difference Meter screen:
apply 2 A for at least 15 seconds, made possible by the 1 Difference Meter scale
high-capacity built-in rechargeable batteries, together with 2 Previous result markers in red indicates noise was present
a separate inductive load function. The batteries can be fully
3 Reference measurement
recharged in 2.5 hours, minimizing down time.
4 Previous result markers
Note: The DLRO2 is not ATEX/intrinsically safe rated and
5 Electrical noise warning
must not be used in explosive gas environments.
6 Percentage difference between current measurement and
initial reference measurement
DLRO2
Ducter™ Low Resistance Ohmmeter 2 Amp
DLRO2 keeps you testing and produces reliable n Cable manufacturers – quality control, cable length.
measurements n Component manufacturers – quality control.
To ensure the DLRO2 is always ready to test, the supplied n Space exploration and engineering – structural metal
fitted as standard AA rechargeable NiMH batteries can to metal, ground network metal to metal, carbon
easily be swapped for non-rechargeable standard AA fiber to metal, carbon fiber to carbon fiber.
alkaline batteries to keep you testing. n Data centers – during electrical installation of main
The DLRO2 provides 1% accuracy with a focus on panel, generator and UPS systems. Verification of
repeatability making it ideal for repeated quality tests in protective device contact resistance, busbar parallel
production environments. feeds, busbar lapped joints, optimum resistance over
FEATURES AND BENEFITS torque and cable lug to busbar connections. During
n Easily select functions using the rotary dial. maintenance using trending data for all aspects of the
n Option to run the test in bidirectional mode or in above, verification after repair.
unidirectional mode to save time and battery power. n Medical hand-held opportunity – grounding and
n The ability to view 3 results on the screen at any time bonding systems for protection against microshock
makes it ideal for 3-phase systems. and macroshock.
n Overcome the effects of standing EMF voltages using n Panel/switchgear manufacturers – end of production
the bidirectional test mode. Forward and reverse line testing, site commissioning, maintenance and
results can be viewed on the secondary display. fault finding.
n For stability of results, the instrument will warn you n Robotics – wiring systems and connections which
when electrical noise, or noise from poor clip/probe are subject to stress/movement/vibration, bonding
connections, is present. of component parts to minimize static, grounding of
n Keeps testing as long as you can, with as many as machine, welding leads of robot spot welder.
500 x 2 A - 3 second tests from a full charge. n Electrical infrastructure – cable resistance from one
n Supplied with compact CATIII 600 V/CATIV 300 V end, cable length, identification of parallel supplies
rated kelvin clip test leads. while connected, cable to lug to connection fault
EXAMPLE APPLICATIONS finding. Checking assembled connections main supply
n Aviation – lightning protection testing measuring mΩ cables and panels, switchgear and protective devices,
resistance between receptors, wing tip to wing tip UPS and changeover panels, interlinking busbars,
etc., using long test leads. Optional long cable reel interlinking cables, distribution and PDU boards,
test leads are available, can be used for assembly of lightning protection systems, final circuits.
components, interconnection of equipment, repair Test modes / options:
and maintenance. The DLRO2 has three main test modes
n Wind turbines – lightning protection, measuring mΩ n Normal resistance mode (μΩ)
resistance between wing tip to ground connection at n Fast/long test leads test mode (mΩ)
base using long test leads. Optional long cable reel n Inductive resistance mode (μΩ)
test leads are available. Normal Resistance mode: gives the most flexibility. The
n Rail, tram and underground – rolling stock and user can set any maximum test current range up to 2 A
infrastructure, track high current joints, signalling and the instrument will auto range to suit the measured
systems. resistance up to that value. Useful if the test piece has
n Marine – power wiring systems, protection systems, a limit to the current it can withstand. The user has full
ship-to-shore bonding, cathode protection system control of the instrument’s test features which is suitable
testing and cable laying applications. for many applications, as listed above.
n Oil and gas pipelines – bonding between welded Fast/long test leads mode: only has one user option,
joints and grounding systems. which is manual/auto. ‘Manual’ starts the test when the
n Automotive and EV – battery connections, weld TEST button is pressed, ‘auto’ starts the test automatically
quality, crimped connections quality, assembly robot when the instrument detects continuity. In this mode,
welding cables. the instrument settings are optimized for speed and, if
DLRO2
Ducter™ Low Resistance Ohmmeter 2 Amp
needed, the use of very long test leads. The test current is SPECIFICATIONS
only in one direction for speed, 1 A and above, resistance PHYSICAL
is only displayed in mΩ. This test mode is ideal for many Dimensions:  8.98 x 4.1 x 2.95 in.
applications but is focused on applications where: (228 x 105 x 75 mm)
n The user is not technically trained. Use is simple, there Display: 
Full LCD color screen with user
are no settings to change. Where test procedures configurable backlight
need to be very simple, “switch on, select this range Weight: 32 oz (905 grams)
and press TEST” for example. SAFETY AND ELECTRICAL PROTECTION
n The required minimum test current will be 1 A. Safety rating: CATIII 600 V / CATIV 300 V to
n The measurement will only be in mΩ. Non-technical EN 61010, IEC 61010-031 : 2015,
users can simply read a number and compare it with a IEC 61010-030
predetermined value. Safety category rating valid to
n May need the use of very long test leads. altitude of 9842 ft (3000 m)
Example applications include: Live voltage: Active live voltage protection to
n Wind turbine lightning protection (wing tip to ground 600 V between any test terminals
without blowing a fuse. Live voltage
at base resistance) warning on display and audible
n Subsea cable laying, checking cable resistance and when >5 V is applied between
ground connections any test terminals. Fuse protected
n Manufacturing, including cable resistance, large cable to 1000 V, fuses are not user
changeable.
looms or assemblies etc.
Inductive resistance mode: tests with the test current TEST CURRENT OUTPUT
Normal resistance test mode:
set to 1 A to speed up the charge time. The test current
Current ranges: 2 A, 1 A, 100 mA, 10 mA and 1 mA
will be auto ranged up as the inductance is charged.
Maximum compliance output voltage:
Additional convenience is added with a clever ‘auto stop’
3.24 V (1 A mode) 2.2 V (2 A mode)
feature. The instrument will monitor the rate of change
Current output accuracy:
and automatically stop the test as soon as the result is
 Normal and inductive mode: ±10 %
stable. Long lead test mode: +10 % -0%
Example applications include: at all battery conditions except
n Electric motors, small to medium in size, including with low battery indication.
railway traction motor stator winding resistance Thermal EMF/Seebeck effect compensation:
n Small power distribution transformers  Yes, average of forward and reverse
n Continuity detection at less than 2000 Ω test current measurements.
LOW RESISTANCE MEASUREMENT
Resistance measurement test modes:
 Normal test mode, fast mΩ/long test
lead mode and inductive test mode
(resistance of inductive loads).
Overall resistance range: 1 µΩ – 2000 Ω
Max resistance across C terminals:
 2 A with up to 1.1 Ω total resistance
and 1 A with up to 3.2 Ω total
resistance.
Wind turbine lightning protection lead sets are specifically Basic accuracy: Bi-directional test current mode:
designed for measuring resistance for lightning protection ± 1% ±2 digits.
circuit between wind turbine blade tip to ground. Three Uni-directional test current mode:
lengths are available: 100 ft (30 m), 200 ft (60 m) and ± 1% ± 10 digits.
330 ft (100 m). Inductive mode or unidirectional
mode will introduce an undefined
error if an external EMF is present.
DLRO2
Ducter™ Low Resistance Ohmmeter 2 Amp
ENVIRONMENT POWER SUPPLY
Noise immunity: Less than 1% ±20 digits additional Rechargeable 6 x AA NiMH batteries with built-in fast
error with 80 mV peak 50/60 Hz charge
with on screen noise limit indicator. (also has the ability to use non-rechargeable alkaline
Less than 1% ±20 digits additional AA batteries (LR6)
error with 80 mV peak 400 Hz with Battery charge time < 4 hours
on screen noise limit indicator. Battery life >1000 bi-directional tests at
EMC: IEC61326-1, industrial specification 2 A auto into a 1 Ω load
IEC61326-2-2.
Dust and moisture BATTERY CHARGER ADAPTOR
ingress: IP54 to IEC60529 in use Line input voltage: 100 to 240 V
Altitude: Operational to 9842 ft (3000 m) Line input frequency:
Temperature: Operational range 32º F to 122º F 50 to 60 Hz
(0 ºC to 50 ºC) Output: 12 V DC 1.2 A 14.4 W max
Storage range -4º F to +122º F
(-20 ºC to 50 ºC) Type: 
Travel adaptor/interchangeable plug
adaptor
Humidity: Operational to 95%
Storage to 90% Plug types: Australia, USA, Europe and UK plugs
CONNECTIONS
Test terminals: 4 x 4 mm
shrouded sockets
Battery charger: 2.5 mm
DC jack connector

Resistance measurement ranges:

Full Scale Test Current Resolution Normal Inductive Mode Long Test Lead
Resistance Resistance Mode Mode (1 A only)
15000 µΩ 2.00 A 1 μΩ 
120.00 mΩ 2.00 A 0.01 mΩ 
1000.0 mΩ 2.00 A 0.1 mΩ 
30.000 mΩ 1.00 A 0.001 mΩ   
240.00 mΩ 1.00 A 0.01 mΩ   
2200.0 mΩ 1.00 A 0.1 mΩ   
300.00 mΩ 100 mA 0.01 mΩ 
2500.0 mΩ 100 mA 0.1 mΩ 
20.000 Ω 100 mA 0.001 Ω  
3000.0 mΩ 10.0 mA 0.1 mΩ 
24.000 Ω 10.0 mA 0.001 Ω 
200.00 Ω 10.0 mA 0.01 Ω  
30.000 Ω 1.00 mA 0.001 Ω 
240.00 Ω 1.00 mA 0.01 Ω 
2000.0 Ω 1.00 mA 0.1 Ω  
DLRO2
Ducter™ Low Resistance Ohmmeter 2 Amp

ORDERING INFORMATION
Description Part number Description Part number
DLRO2, Ducter Low Resistance Ohmmeter 2 A 1012-280 Optional accessories
Included accessories Set of 4 Kelvin probe pins
Kelvin clip lead set 2m CAT IV 300 V 10 A 1011-928 Replacement probe tips 1012-064
Kelvin probe lead set 2m CAT IV 300 V 10 A 1011-929 4 right angled adaptors to allow hook
terminated (E.g. KC100) leads to fit DLRO2 1012-511
100-240 V, 50/60 Hz Charger power supply 1002-736
DLRO2 current and potential leadset 2m. 2 x red lead,
Six Batteries: 1.2 V NiMH AA 2000mAHR 1002-735
2 x blk lead, 2 x grabber clip, 2 x probe 1011-673
Hanging hook and strap 1012-068
10 A fused test probe and clip lead set 1013-224
Soft pouch 1012-063
Certificate of calibration traceable to NIST CERT-NIST
USB memory stick (with user guide)
*KC30 Wind turbine lightning protection test leads,
100 ft (30 m) 1001-249
*KC60 Wind turbine lightning protection test leads,
200 ft (60 m) 1001-248
*KC100 Wind turbine lightning protection test leads,
330 ft (100 m) 1000-809
* Requires P/N 1012-511 to fit

SALES OFFICE DLRO2_DS_US_V02

Megger USA - www.megger.com
Valley Forge Corporate Center ISO 9001
2621 Van Buren Avenue, Norristown,
The word ‘Megger’ is a registered trademark
Pennsylvania, 19403, USA
T. 1-866-254-0962
F. 1-610-676-8625