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DLRO10 Low Resistance Ohmmeter with DH4-C

The Megger DLRO10 DUCTER 10A Micro-Ohmmeter is equally at home in the lab, the workshop or in the field. DLRO10 is small, lightweight, portable, rugged & easy-to-use.

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Megger DLRO10 DUCTER 10A Micro-Ohmmeter with DH4-C

Megger DLRO10 10 A Tester is small, lightweight and portable designed for ground bond testing, routine maintenance and corroboration of protection systems to prevent long term damage to equipment. Megger DLRO10 provides accurate test results in under 3 seconds! The device uses a four-terminal resistance method that shows the true resistance of the item under test (IUT).

Each device automatically applies forward and reverse currents to the IUT, cancelling out any standing voltages, as well as checks for undue noise during measurement to reduce the possibility of recording an incorrect result.


Megger DLRO10 is perfect for:

  • Utilities (inc. wind turbines. See KC series test leads data sheet)
  • Chemical plants
  • Refineries
  • Mines
  • Railroads
  • Telecommunication Companies
  • Automotive manufacturers
  • Anywhere UPS battery back-up systems are used

▶ Video: Megger DLRO Low Resistance Ohmmeters:

Thumbnail for the Megger DLRO Low Resistance Ohmmeters video

Megger DLRO10 Key Features:

  • NEW interchangeable test lead terminations
  • Auto current reversal cancels standing emfs
  • Protected to 600 V
  • Automatically detects continuity in potential and current connections
  • Multiple operating modes including fully automatic
  • Can be used in tight places, reduces the need for extra long leads and two person operation.
  • 4 terminal resistance method shows the true resistance of the item under test
  • Bright LED displays are easily visible under all lighting conditions and reduce human error 
  • Automatically applies forward and reverse currents which cancel out any standing voltages across the sample under test
  • Checks for undue noise during measurement, reducing the possibility of recording the incorrect result
  • Automatically detects continuity in P and C circuits, preventing erroneously high reading to be taken due to high resistance contact
  • Battery module has a battery condition indicator allowing the user to check the state of spare batteries without connecting to the instrument

New duplex connect test leads - now supplied as standard (see images or data sheet)


Megger DLRO10 Applications:

The needs for accurate low resistance measurement are well known and very diverse.  They range through Goods Receiving inspection of components to ground  bonding and welded joints.  Typical applications include, but are not limited to, making d.c. resistance measurements of:

  • Switch and contact breaker resistance 
  • Busbar and cable joints
  • Aircraft frame bonds and static control circuits 
  • Integrity of welded joints
  • Inter-cell connections on battery systems up to 600 V peak
  • Quality control of resistive components
  • Transformer and motor winding resistance
  • Rail and pipe bonds
  • Metal alloys, welds and fuse resistance
  • Graphite electrodes and other composites
  • Wire and cable resistance
  • Transmitter aerial and lightning conductor bonding


What comes with the Megger DLRO10?

  • (1006-598) Megger DLRO10 10A Low Resistance Ohmmeter
  • (6121-492) 7 Ah NiMH Battery Module
  • (1006-444) DH4 Duplex Handspikes (2x), One with Indicator Lights (1.2m)
  • (6280-333) Battery Charger (115/230V 50/60Hz Supply)
  • (6280-332) Cigar Lighter Adapter for Battery Charging
  • User Guide
  • Warranty Book


What is Low Resistance?

It‘s a measurement below 1.000 ohm. At this level it is important to use test equipment that will minimise errors introduced by the test lead resistance and/or contact resistance between the probe and the material being tested.  Standing voltages across the item being measured may also cause errors, which need to be identified (eg. thermal emfs at junctions between different metals).

To allow a measurement to compensate for these errors, a four terminal measurement method is carried out with a reversible test current and a suitable Kelvin Bridge meter.  Low resistance ohmmeters like the Megger DLRO10 are designed specifically for these applications.

Why Measure Low Resistance?

An operator periodically tests low resistance to prevent long-term damage to existing equipment and to minimise energy wasted as heat. These measurements indicate any restrictions in current flow that might prevent a machine from generating its full power or allow insufficient current to flow to activate protective devices in the case of a fault. 

Unexpected changes in the measured values, and the trending of this data help indicate and forecast possible failure conditions. Excessive changes in measured values point to the need for corrective action to prevent a major failure.



Comparison Chart for: Megger DLRO10 Low Resistance Ohmmeter with DH4-C

Nominal currentUp to 10 AUp to 10 AUp to 10 AUp to 10 AUp to 2 A
No of ranges with power limited to 0.25 W6666
No of higher power ranges22
DisplayLCD BacklitLCD BacklitLCD Backlit
Results storage and download
Power supply
Rechargeable battery
Weight6.7 kg6.7 kg2.6 kg2.6 kg4.5 kg


Accessory Code Description Price (Ex VAT)
1000-809 KC100 Wind Turbine Lightning Protection Lead Set 100m on Reel £1,200.00 ADD
1001-248 KC60 Wind Turbine Lightning Protection Lead Set 60m on Reel £1,110.00 ADD
1001-249 KC30 Wind Turbine Lightning Protection Lead Set 30m on Reel £1,060.00 ADD
1001-653 USB - RS232 Adaptor £70.00 ADD
1002-390 DH7 Duplex Handspikes 600V rated. Needed for DLRO10HD CATIII 300V rating £210.00 ADD
1005-623 Lid Pouch (Spare) £34.00 ADD
25955-025 Serial PC Download Lead £12.00 ADD
35871 USB-serial Adaptor £45.00 ADD
6111-518 DH6 Duplex Handspikes 600V rated. Needed for DLRO10 CATIII 600V Rating £515.00 ADD
6121-492 7Ah NiMH Rechargeable Battery Module £510.00 ADD
6280-333 115V or 240V 50/60Hz Battery Charger £99.00 ADD
1006-445 DH5-C Connect Duplex Handspike 3m (x2) Complete Duplex Lead Set £340.00 ADD