Megger DLRO10HD Digital Low-Resistance Ohmmeter, 10 A

Availability: 3 to 4 Weeks3 to 4 Weeks

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Combining the ultimate simplicity of operation with a rugged IP65 case designed for stable ground and bench operation, this ohmmeter features rotary switch controls that are simple and easy to operate in all weather conditions and with gloved hands. It provides significantly enhanced compliance and delivers 10 A into measurements up to 250 mΩ and 1 A up to 2.5 Ω. Additionally, a large, clear, backlit LCD is easy to read from a distance.

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: IP65 lid closed, IP54 operational (battery operation only)
• Rotary mode switch with bidirectional (current reversal with averaging cancels thermal EMFs), unidirectional, automatic, continuous, and inductive modes
• Interchangeable test lead terminations
• Download to PowerDB
• Rugged case well suited to transportation with shoulder strap and lead set pouch
• Removable lid facilitates easy test lead connection
• Operational ingress protection is IP54 (battery power only) ensuring protection from the elements
• 7 Ah lead acid battery provides extended operation and can be charged whilst operating from mains power
• Large, clear LCD display with backlight and contrast adjustment
• Auto power off function conserves battery

Test modes

Normal mode is initiated by pressing the 'Test' button after connecting the test leads to the unit under test. The continuity of all four connections is checked. Current is applied in both forward and reverse directions following which measurement is displayed.

Automatic mode is started as soon as the probes make contact. Forward and reverse current measurements are made and the average value is displayed. This mode is ideal when working with handspikes. Each time the probes are removed and reconnected to the load a new test will be performed without the need to press the test button.

Automatic unidirectional mode applies current in one direction only to speed up the measurement process. However thermal EMF resulting from dissimilar metal bonds can cause lower accuracy. The test starts automatically when probes are connected.

Continuous mode allows repeated measurements to be made on the same sample. Simply connect the test leads and press the test button. The measurement is updated every three seconds until the circuit is broken.

Inductive mode is selected when measuring resistance on, for example, motors and generators. When measuring inductive loads it is necessary to wait for the voltage to stabilize as the inductive element is charged. Test leads are firmly connected to the device under test and the 'Test' button is pressed. The instrument will pass the selected current through the sample continuously in one direction only and take repetitive readings that will gradually decrease to the true value as the voltage stabilizes. The operator decides when the result is stable and presses the 'Test' button to terminate the test.

Applications

• Home laboratory
• Workshop
• In the field
• Bench or ground operation
• Railways
• Aircrafts
• Resistance of components
• Electric motors and generators
• 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 300 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