Megger DLRO2 Offers

To ensure the ohmmeter is always ready to test, this ohmmeter comes with AA rechargeable NiMH batteries that can be swapped for non-rechargeable standard AA alkaline batteries. In addition, this ohmmeter is ideal for outdoor use with an IP54 rating which ensures that neither rain nor dust will prevent testing.

Features

• '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 CAT III 600 V/CAT IV 300
• Easily select functions using the rotary dial
• Option to run the test in bidirectional mode or in unidirectional mode to save time and battery power
• The ability to view three results on the screen at any time makes it ideal for 3-phase systems
• Overcome the effects of standing EMF voltages using the bidirectional test mode
• Forward and reverse results can be viewed on the secondary display
• For stability of results, the instrument will warn you when electrical noise, or noise from poor clip/probe connections, is present
• Keeps testing as long as you can, with as many as 500 x 2 A - 3 second tests from a full charge

Test modes/options

The ohmmeter has three main test modes:

• Normal resistance mode (μΩ)
• Fast/long test leads test mode (mΩ)
• 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 needed, the use of very long test leads. The test current is only in one direction for speed, 1 A and above, resistance is only displayed in mΩ. This test mode is ideal for many applications but is focused on applications where:

• The user is not technically trained. Use is simple, there are no settings to change. Where test procedures need to be very simple, "switch on, select this range and press TEST" for example
• The required minimum test current will be 1 A
• The measurement will only be in mΩ. Non-technical users can simply read a number and compare it with a predetermined value
• May need the use of very long test leads. Example applications include:
• Wind turbine lightning protection (wing tip to ground at base resistance)
• Subsea cable laying, checking cable resistance and ground connections
• Manufacturing, including cable resistance, large cable looms or assemblies, etc.

Inductive resistance mode

Tests with the test current set to 1 A to speed up the charge time. The test current will be auto ranged up as the inductance is charged. Additional convenience is added with a clever ‘auto stop' feature. The instrument will monitor the rate of change and automatically stop the test as soon as the result is stable.

Applications

• 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
• 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
• Rail, tram and underground – rolling stock and infrastructure, track high current joints, signalling systems
• Marine – power wiring systems, protection systems, ship-to-shore bonding, cathode protection system testing and cable laying applications
• Oil and gas pipelines – bonding between welded joints and grounding systems
• Automotive and EV – battery connections, weld quality, crimped connections quality, assembly robot welding cables
• Cable manufacturers – quality control, cable length
• Component manufacturers – quality control
• Space exploration and engineering – structural metal to metal, ground network metal to metal, carbon fibre to metal, carbon fibre to carbon fibre
• Data centres – 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
• Medical hand-held opportunity – grounding and bonding systems for protection against microshock and macroshock
• Panel/switchgear manufacturers – end of production line testing, site commissioning, maintenance and fault finding
• 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
• 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.