Megger DLRO10HD 10 Amp Digital Low Resistance Ohmmeter
Measuring low resistance helps identify resistance elements that have increased above acceptable values. The operation of electrical equipment depends on the controlled flow of current within the design parameters of the given piece of equipment. In the modern age of electronics, increased demands are placed on all aspects of electrical circuitry.
Low resistance measurements, with a unit like a Megger DLRO10HD 10 Amp Digital Low Resistance Ohmmeter are required to prevent long term damage to existing equipment and to minimize energy wasted as heat. They 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. Periodic tests are made to evaluate an initial condition or to identify unexpected changes in the measured values, and the trending of this data helps indicate and may forecast possible failure conditions. Excessive changes in measured values point to the need for corrective action to prevent a major failure.
What is a Low Resistance Measurement?
A low resistance measurement is typically a measurement below 1.000 ohm. At this level it is important to use test equipment that will minimize errors introduced by the test lead resistance and/or contact resistance between the probe and the material being tested. Also, at this level, standing voltages across the item being measured (e.g. thermal emfs at junctions between different metals) may cause errors, which need to be identified.
Industries with Significant Resistance Problems
Industries that consume vast amounts of electrical power must include low resistance ohmmeter measurements in their maintenance operations. Not only does abnormally high resistance cause unwanted heating, possibly leading to danger, but it also causes energy losses which increase operating costs; in effect you are paying for energy which you can’t use. A general list of industries include:
- Power generation and distribution companies
- Chemical plants
- Refineries
- Mines
- Railroads
- Telecommunications companies
- Automotive manufacturers
- Aircraft manufacturers
- Anyone with UPS battery back-up systems
Download the complete article “Guide to Low Resistance Testing”
Megger DLRO10HD 10 Amp Digital Low Resistance Ohmmeter
JM Test Systems now carries the Megger DLRO10HD Low Resistance Ohmmeter.
- 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 switch selects one of five test modes, including auto start on connection, giving ease of use
DESCRIPTION
Augmenting Megger’s DLRO10 and 10X range of low resistance ohmmeters the DLRO10HD combines ultimate simplicity of operation with a rugged IP65 case designed for stable ground and bench operation. The unit is powered from either its rechargeable battery or line power making it suitable for continuous testing in production line/repetitive use environments. Rotary switch controls are simple and easy to operate in all weather conditions and with gloved hands. A large, clear, backlit LCD display is easy to read from a distance. The DLRO10HD provides significantly enhanced compliance and is capable of delivering 10 A into measurements up to 250 mΩ and 1 A into measurements up to 2.5 Ω. The duration of each test may be up to 60 seconds. The DLRO10HD is rated CAT III 300 V. A range of test leads is available to suit the application. The DLRO10HD provides five test modes each of which is selected through a simple rotary control.
TEST MODES
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. 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 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. Download the complete Data Sheet and Comparison Chart for the Megger DLRO10HD
JM Test Systems is a Stocking Distributor of Megger products
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