Cost-effective solution for low-resistance testing
A
Megger product story
Edited by the Engineeringtalk editorial team
Sep 7, 2004
For the wide range of low-resistance testing applications which require test currents of up to 200A, Megger's new DLRO200 digital low-resistance ohmmeter is a convenient and cost-effective choice.
For the wide range of low-resistance testing applications which require test currents of up to 200A, Megger's new DLRO200 digital low-resistance ohmmeter is a convenient and cost-effective choice.
This new instrument, which is one of the lightest in its class, is not only very portable, but also features a robust IP54 (splashproof) case which ensures that it will easily withstand the rigours of use on site.
Ideal for use in testing circuit breaker contacts, busbar joints, joints between railway lines and other applications requiring accurate resistance measurements at high test currents, Megger's DLRO200 incorporates a large liquid crystal display which shows all test parameters and results.
It also has an internal memory capable of storing up to 300 test results and associated notes which can be entered quickly and easily using the built-in alphanumeric keyboard.
Stored data can subsequently be recalled to the display.
Alternatively, data can be downloaded to a computer, or output directly to a printer, via the instrument's RS232 port.
To ensure maximum versatility, the test current used by the DLRO200 is continuously variable from 10 to 200A, making it unnecessary for users to employ separate test sets with fixed operating currents of, for example, 50, 100 and 200A.
The maximum test current for every test is easily set via the keyboard, ensuring that the equipment under test is fully protected against damage caused by excessive current flow.
The DLRO200 low-resistance ohmmeter has a measuring range of 0.1uohm to 999mohm.
Four-terminal testing is used to cancel the resistance of the test leads, and the instrument offers a choice of three operating modes.
In continuous mode, once the "test" button has been pressed, current flows continuously through the circuit until the button is pressed again.
Results are captured and displayed every two seconds for the duration of the test.
In normal mode, pressing the test button initiates a single test, where the current ramps up, holds steady for the test, and then ramps down to zero over a period of 7s.
Auto mode is similar to normal mode, except that the test sequence is initiated automatically when the potential leads are connected, saving time when multiple tests have to be performed on the same piece of equipment.
Megger's cost-effective DLRO200 low-resistance digital ohmmeter is supplied complete with test leads, download software for results, an RS232 download cable, and a user manual on CD-ROM.
It is available with either a QWERTY keyboard for English-speaking markets, or an AZERTY keyboard for other markets.
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