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Megger DLRO100E-EB Digital Low Resistance Ohmmeters

The Megger DLRO100 enables low resistance measurement, across multiple applications, even in areas without access to mains power.

Next Day Delivery (subject to availability)

£3,355.00 excluding VAT £4,026.00 including VAT @ 20% Regular Price: £4,254.00
  • 0.1 µΩ to 1.999 Ω
  • 100A Testing
  • CAT IV 600 VAC / 500 VDC
  • Custom Test Sequences
  • Mains/Battery Powered
  • Resolution 0.1 µΩ
  • Smooth DC output for MCB testing
  • Multiple operating modes
  • FreeDelivery
  • 30DayMoneyBack
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Megger DLRO100E Series Digital Low Resistance Ommeters

A significant addition to the comprehensive range of Megger Low Resistance Ohmmeters, DLRO100 enables low resistance measurement, across multiple applications, in areas without access to mains power. The integral Li-Ion battery supplies a constant 100 A current for up to 200 Manual/Auto tests to enable enhanced productivity in remote locations. With a focus on user safety, advanced design features ensure the safe operation of the instrument in the most adverse conditions, including a CAT IV 600 VAC / 500 VDC safety rating in accordance with IEC61010. The rugged design, intuitive interface and IP54 (lid open) rating ensure reliability and ease of use in the most arduous of conditions.

There are three models in the series, all three models can be line powered, are rated CAT IV 600 V and can test currents from 10 to 110 A. B in the model name indicates the battery powered option (in addition to AC power).

  • DLRO100 E or EB - The base model. 
  • DLRO100 X or XB - The mid-range model includes all features in the basic model, with added data storage and DualGround™ testing capability.
  • DLRO100 H or HB - The top-of-the-line model includes features in the E and X models, with asset tagging (enter unique asset ID's using the DLRO100 Asset Tag Windows app), Bluetooth® download and USB remote operation.

Megger DLRO100E/EB Comes Supplied With:

  • Certificate of Test
  • Quick Start Guide
  • Calibration Certificate
  • CD Containing User Guide
  • Mains Lead

A lead set is NOT included with the instrument and must be ordered as an optional accessory.

Test Modes

The Manual test mode allows the user to initiate the test procedure once the probes are in contact with the object under test. Once the TEST button is depressed the TEST lamp will illuminate and the instrument will undertake a single test to verify the resistance of the test object.

In Auto mode the user selects the desired current, connects the current test leads and as soon as the potential leads are connected a test will start automatically. To repeat a test, simply break contact with the potential probes and remake contact.

In Continuous mode the user connects the test leads and presses the TEST button, initiating the test procedure. The instrument will continue to test, updating the display after each new test cycle, until the TEST button is pressed or the test procedure times out.

Key Features:

  • CAT IV 600 VAC / 500 VDC for safe operation
  • Lightweight 100 A battery powered unit for portability
  • High noise immunity for stable readings
  • Smooth DC Output for circuit breaker testing
  • IP54 for protection against dust and moisture whilst testing

Typical Applications:

The need for accurate low resistance measurement is well known and very diverse.

Utilities & Service Contractors – commissioning new installations & regular maintenance testing of 

  • Switchgear and circuit breaker contact resistance
  • Busbar and cable joints
  • Wire and cable resistance
  • Lightning conductor bondin

Original Equipment Manufacturer – detecting manufacturing defects 

  • Production test of circuit breakers – contacts & joints
  • Production test of high voltage switchgear
  • Production test of welded joints & connections

Transport – manufacturing & maintenance 

  • Railway rolling stock ground connections & manufactured joints
  • Railway lines & conductor rails – commissioning & maintenance
  • Aircraft frame bonds and static control circuits

Which model is right for me?
Featuress E EB X XB H HB Benefits
CAT IV 600 VAC / 500 VDC up to 2000 m
CAT IV 300 V up to 4000 m
On all test terminals for safe operation
Lightweight 100 A battery powered unit Easily portable – 7.9 Kg (17 lbs) with battery
Mains only Mains only units for manufacturing and production applications where AC is always available. Weight 7.0 Kg (15.5 lbs)
High noise immunity For stable readings in noisy environments
Smooth DC Output Circuit breaker testing
IP54 Lid open
IP65 Lid closed
For protection against ingress during operation (lid open) and storage (lid closed)
Li-ion battery Always ready to test with a Li-ion fast charge battery - 2.5 hours charge time from fully discharged Works from an AC supply if the battery is fully discharged Battery capacity - 200 single tests or up to 2x 10 minutes continuous 100 A output for extended use
100A Manual, Auto and Continuous test Quick selection of test modes for different applications with 4 terminal measurement for flexibility
Custom test Adjustable current 10 - 110 A, ramp rates configurable from 0.5s upto 30s and configurable test duration for flexibility
Range and test mode rotary switches
Quick and easy selection of current ranges and test modes
Ultra tough outer case construction Designed for use in demanding environments with a flame retardant UL94 V0 inner case for safety
Dual Ground™ ⚫* ⚫* ⚫* ⚫* Using the optional DC clamp enables circuit breaker testing with ground protection in place for safety
Large, clear LCD Ideal for all light conditions, with backlight
Internal memory storage with USB download capability For effective results management, up to 220 time and date stamped records
Remote Control Control the instrument remotely over USB via a PC or laptop for added safety
Asset tagging Running a PowerDB app on Windows tablet or smart phone to populate unique asset IDs for efficient asset management
Bluetooth® For effective wireless communication. For download and asset tagging

* with optional Clamp All models. Two year warranty - second year conditional on free product registration.

Spares & Accessories (Not Supplied):

DLRO100E Optional Accessories
DLRO100 CAT IV 600V Lead Set (5m) 1004-448
DLRO100 CAT IV 600V Lead Set (10m) 1004-449
DLRO100 CAT IV 600V Lead Set (15m) 1004-450
DLRO100 Terminal adapters (x2) 1005-555
DLRO100 CAT IV 600 V Kelvin Lead Set (5m) 1005-634
DLRO100 CAT IV 600 V Kelvin Lead Set (10m) 1005-635
DLRO100 CAT IV 600 V Kelvin Lead Set (15m) 1005-636
DLRO100 DC Clamp (MCPD 100L) 1005-622
DLRO100 ISO17025 (UKAS) Calibration Certificate 1005-888
DLRO100 Lithium Ion Battery Pack 1005-973

ISSWWW and Megger

The extensive Megger product portfolio provides electrical test equipment for an exceptionally wide range of applications at any point of the electricity network. From small handheld low voltage equipment such as multifunction installation testers through to high voltage asset test equipment like insulation resistance testers, circuit breaker analysers, protection relay test systems to transformer condition measurement devices.

Megger designs and manufactures portable electrical test equipment in factories located in Germany, Sweden, the UK, and USA. Megger products help you install, improve efficiency, reduce cost and extend the life of you or your customers’ electrical assets.

Established in the late 1800s, the company has been designing and making test and measurement instruments that perform electrical measurements for preventative maintenance, troubleshooting and commissioning for decades. Megger products have supported customers all over the world to improve their facilities’ efficiency, reduce costs, extend the life of apparatus and through trending and analysis, anticipate equipment failure and future performance.
Being a brand synonymous with the industry and a cornerstone pioneer of many of today’s everyday items of test equipment, ISSWWW are proud to bring you Megger’s full range of equipment and services, now and into the future.

Megger DLRO100E Series Technical Specifications
Measurement Range 0.1μΩ to 1.999Ω
Resolution 0.1μΩ
Noise Rejection Differential 100mV @ 50-60Hz on test leads
DC Output Smooth DC
IP Rating IP54 (Lid Open)
IP65 (Lid Closed)
Operating Temperature Range -20 to 50°C
Storage Temperature Range -30 to 70°C
Humidity <85% RH non-condensing
Battery Life 200 single 100A tests or up to 2x 10 minutes continuous 100A output
Battery Type User replaceable lithium ion battery pack
Battery Charge Time Full charge in 2.5 hours from dead
Maximum Output Voltage 2V (battery), 3V (AC)
EMC IEC61326-1
Safety IEC 61010
CAT IV 600V AC / 500V DC up to 2000m
CAT IV 300V up to 4000m
Dimensions 400 x 300 x 200mm
Weight 7.0kg (AC only)
7.9kg (with battery)

Standard FREE 3-5 Day Courier Delivery – UK Mainland only - Zones A & B
Included in the price for all orders over £40.00 (exc vat). Sent using express courier, delivered within 3-5 working days from the date of your order, subject to availability.

Standard 1-2 Day Express Courier Delivery – UK Mainland only - Zones A & B
£4.50 for all all orders under £40.00 (exc vat). Sent by express courier, delivered within 1-2 working days from the date of your order, subject to availability.

Express Courier 1-2 Day Delivery – UK Mainland only - Zones A & B
£4.50 select at the checkout. Sent using express courier.

Next Day Delivery – UK Mainland only - Zones A & B
£8.00 select at the checkout. Sent using express courier, orders must be placed before 3pm for next day delivery, subject to availability.

Saturday Pre 12am - UK Mainland only - Zones A & B
£15.00 select at the checkout. Sent using express courier, orders must be placed before 3pm for Saturday delivery.

Orders must be placed before 3pm for next day delivery and a telephone number supplied, subject to availability.
Please note that predicted delivery times are based on regular trading days Monday to Friday. Public holidays, bank holidays and weekends are outside the usual scope of our dispatch and therefore may incure additional days lead time to your order.

Orders requiring calibration. Whilst we take the greatest care to get all orders dispatched and delivered to you in the stated time frame, orders received late afternoon and requiring calibration may on occasion miss dispatch that day, according to the complexity of the calibration. Be assured they will ship on the next dispatch, this in most cases should not add more than 24 hours to you delivery.

Delivery Surcharges
Because of the high cost of carriage we need to apply a surcharge on all deliveries made in the following regions bringing the carriage charges to:

  • Zones A & B  - Mainland delivery rates apply. 
  • Zone C - Scottish Highlands. 
  • Zone D - Outer Hebrides, Orkney Isles, Shetland Isles, Isle of Man, Scilly Isles, and Channel Islands.
  • Zone E - Northern Ireland
  • Zone F - Republic of Ireland

New Postage Map Sept 2018> 

International delivery

International delivery charges are automatically added to your order at the checkout; you can also use the guide below for a guide on prices. For any questions regarding international deliveries please contact us at

If no shipping option is available to your selected country please call us on +44 (0) 1603 406 148 to purchase your items.