Megger DLRO10HD Low Resistance Ohmmeter w/ DH4-C Test Lead Set

  • High or low output power selection for condition diagnosis
  • Measures resistance values between 0.1 µ ohms to 2500 ohms
  • Heavy duty case: IP 65 lid closed, IP54 operational (battery operation only)
More Info

Megger DLRO 10 HD Low Resistance Ohmmeter

The Megger DLRO10HD low resistance tester can output up to 10 Amps and is built into a tough case that provides an IP65 ingress protection rating when closed and an IP54 rating when the instrument is in use and operating from battery power. This Megger low resistance test and measuring instrument incorporates a large backlit liquid crystal display that can be read from distance its rotary switch controls can be operated with gloved hands.

With 0.1 micro-ohm resolution, 0.2 per cent basic accuracy and a dedicated mode for use with inductive loads, the Megger DLRO10HD is suitable for applications such as checking welded joint quality, verifying winding resistance in large motors and transformers, performance of lightning protection bonds and aircraft structures.

To provide maximum versatility, this test set not only features high compliance but also offers user-selectable high or low power ranges.

The high power <25W ranges (measuring up to 250milliohm at 10A or 2.5ohm at 1A) are ideal for heating a weakness or charging inductive loads.

The low power ranges are power limited to 250 mW for applications where it is desirable to avoid heating the item under test.

Test Modes on the Megger DLRO10HD:

  • Normal mode, the test is initiated by pressing the 'test' button. The instrument verifies continuity of all four connections, and then applies the test current in both forward and reverse directions before displaying the result.
  • Automatic mode, the test starts as soon as the probes make contact with the item under test.
  • Automatic unidirectional mode is the same as automatic mode, but the test current is applied in one direction only. This reduces the testing time, but thermal EMFs from contact between dissimilar metals may reduce the accuracy of the results.
  • Continuous mode makes repeated measurements at three-second intervals on the same sample.
  • Inductive mode is, as the name suggests, optimised for tests on motors, transformers and other inductive loads, supplying a full 10A for 60 up to seconds.

DLRO10HD heavy-duty low-resistance ohmmeters from Megger are supplied with a set of test leads fitted with high-quality duplex hand spikes featuring lights to remotely indicate when a test is complete or inadvertent connection to live supply. The DLRO10HD, when used with optional terminal insulating test leads, is rated CATIII, 600V in line with IEC61010.

Which Test Leads?

The Megger DLRO10HD can be supplied without test leads or with two Megger 1.2m DH4 Duplex handspikes with indicator lights (6111-503) or a set of Kelvin Clips selectable above.

Other test lead sets are available to purchase with the Megger DLRO10HD, including the popular choices of the Megger 2.5m DH5 Duplex handspikes (6111-517) and the 600V rated CAT III DH6 Megger Duplex handspikes (6111-518) which can be selected from the options above.

Wind turbine lightning protection testing is made possible with the options of a 30m, 60m or a 100m extension reel. The 100m Megger KC100 Reel (1000-809) can be selected above, although for a full list of available test leads, please click here and contact us for a price and availability.

Megger DLRO10HD Key Features:

  • High or low output power selection for condition diagnosis
  • Rechargeable battery or line power supply, continuous operation, even with dead battery
  • 10 A for 60 seconds, less time waiting to cool, great for charging inductance
  • High input protection to 600 V, inadvertent connection to line or UPS voltage will not blow a fuse
  • Heavy duty case: IP 65 lid closed, IP54 operational (battery operation only)
  • Rotary switch selects one of five test modes, including auto start on connection, giving ease of use

DLRO Model Comparison

Nominal Current Up to 10A Up to 10A Up to 10A
No. of ranges with power limited to 0.25W 6 6 6
No. of higher power ranges 2 - -
Display LCD Backlit LCD Backlit LED 4½ digit
Results storage and download -
Power supply -
Mains Optional Optional
Rechargable battery
Weight 6.7 kg 2.6 kg 2.6 kg

What's In The Box?

  • Megger DLRO10HD Part No: Megger 1006-604
  • 2 x DH4 Duplex handspikes 1006-444 (optional, please select above)
  • Megger KC1-C Duplex Kelvin Clip Lead Set (optional, please select above)
  • Test lead pouch (lid mounted) 1000-036
  • DLRO10HD user guide CD 1000-869
  • Warranty book. 6170-618
  • Calibration Certificate (optional)

Electrical Specifications

Resistance/Current Ranges

  • The green resistance ranges on the keypad indicate low output power (<0.25W) outputs. Red ranges indicate higher 2.5W
  • (1A) and 25W (10A) power outputs

Resolution Accuracy

  • Test Current Accuracy - ±10%
  • Voltemeter Input Impedance - <200kΩ
  • Maximum Lead Resistance - 10A < 100mΩ

General Specifications

  • Temperature Coefficient - <0.01% per ºC, from 5ºC to 40ºC
  • Maximum Altitude - 2000m (6562ft) to full safety specifications
  • Display Size/Type - Main 5 digit + 2 x 5 digit secondary displays
  • Battery Type - 6V, 7Ah sealed lead acid
  • Voltage Input Range - 100-240V, 50/60Hz, 90VA
  • Charge Time - 8 hours
  • Backlight - LED backlight
  • Battery Life - >1000 Auto (3 sec) tests
  • Auto Power Down - 300s
  • Mode Selection - Left Rotary Switch
  • Range Selection - Right Rotary Switch
  • Memory Features (HDX Only) - Right Rotary Switch
  • Weight - 6.7kg
  • Case Dimensions - L315mm x W285mm x H181mm
  • Pouch for Test Leads - Yes (lid mounted)
  • IP Rating - IP65 case closed, IP54 battery operation
  • Record Storage (HDX Only) - 200 test records
  • Safety Rating - In accordance with IEC61010-1, CATIII 300V when used with optional terminal cover (order code: 1002-390)
  • Operating Temperature and Humidity - -10ºC to +50ºC, (14ºF to 122ºF), <90% RH
  • Reference Conditions - 20ºC ± 3ºC
  • Storage Temperature and Humidity - -25°C to +60°C, <90% RH
  • EMC - In accordance with IEC61326-1 (heavy industrial)
  • Noise Rejection - Less than 1% ±20 digits additional error with 100mV peak 50/60Hz on the potential leads. Warning will show if hum or noise exceeds this level
  • Maximum Lead Resistance - 100mΩ total for 10A operation irrespective of battery condition
Label Type Size Download
pdf Megger DLRO Test Leads pdf 937.5 KB Download
pdf Megger DLRO10HD Low Resistance Ohmmeter w/ DH4-C Test Lead Set Datasheet pdf 899.7 KB Download