Find your nearest distributor
 Get in touch
 Log in

600 A Digital Microhmmeter


  • DLRO600
  • Overview  
  • Application  
  • Downloads  
  • Small and weighs less than 33 lbs (15 kg)
  • Test currents from 10 A to 600 A dc
  • 0.1 µohms best resolution
  • On board memory for up to 300 test results and notes
  • RS232 port to download stored results or for real time output to a printer
  • Supplied complete with 16.4 ft (5 m) test leads and download software

Megger DLRO600 measures resistances between 0.1 µohms and 1 µohms, at high currents.

This versatile instrument can provide test currents from 10 amps up to 600 amps subject to the load resistance and supply voltage. A large liquid crystal display provides all the information needed to perform a test; all test parameters and measurement results are displayed.

The unique design allows the weight and size of DLRO600 to be kept to a minimum; the instrument weighs less than 5kg. This small size makes DLRO600 equally at home in the workshop, on the production floor or in the field. The high current capability and compact design make DLRO600 suitable for testing circuit breaker contacts, switch contacts, busbar joints or other applications where high current is needed.


Testing of the contact resistance of high voltage alternating current circuit breakers according to IEC62271-100 calls for a test current with any convenient value between 50A and the rated normal current. The similar American standard ANSI C37.09 specifies that the test current should be a minimum of 100A.

Most electrical utilities will prefer to test at higher currents since they believe this is more representative of working conditions. As an extension to this, the high current resistance measurement has been applied to high voltage cables, cable joints, welds, busbars and switchgear in general.

Maintenance engineers involved in substation maintenance, both within utilities and end users who take their power at higher voltages, and manufacturers of switchgear, bus bars, distribution panels and circuit breakers will find the DLRO600 a powerful tool.