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DLRO600 Ducter Digital Low Resistance Ohmmeter - 600A

The Megger DLRO600 Digital Microhmmeter is versatile providing test currents from 10 amps up to 600 amps subject to the load resistance & supply voltage. A large liquid crystal display provides all the information needed to perform a test; all test parameters & measurement results are displayed.

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DLRO600 Digital Microhmmeter with English Keyboard

Megger DLRO600 measures resistances between 0.1 μΩ and 1 Ω, 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 15kg. 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.

300 sets of results may be stored in DLRO600’s on board memory for later download to a PC or may be output directly to a printer via the RS232 port. You may also add notes to any stored result by using the on board alphanumeric keypad, thereby making later identification of results straightforward.

As well as adding notes to stored results, the alphanumeric keypad allows  you  to  set  the  test  current  directly  by  typing  in  the  value  required.  DLRO600  will  check  the  continuity  of  the  test  circuit,  and  will  quickly  ramp  the  test  current  up  to  the  desired  level.  The  keyboard is also used to set upper and lower limits for the result and to prevent the use of excessive currents by setting an upper limit to the allowable test current.

DLRO600 uses a four terminal measurement technique to cancel the resistance of the test leads from the measurement.

Megger DLRO600 Key Features:

  • Small and weighs less than 15kg
  • Test currents from 10A to 600 A d.c.
  • 0.1 μΩ 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 5m test leads and download software

The History of ‘Ducter’ Testing:

For  over  100  years  the  ‘Ducter  test’  has  been  used  to  describe  a  simple test for measuring very low contact resistances and “Ducter”, which is still used as a trade mark, was the name originally given to the  low  resistance  ohmmeter  manufactured  by  Megger.  The  name  Ducter was registered by Megger in June 1908 and ‘Ducter’ has since become the industry standard.

Megger DLRO600 Test Modes:

DLRO600 operates in one of three modes, which are simply selected from the on screen menu.

CONTINUOUS  mode  is  provided  for  users  who  wish  to  monitor  a  resistance  over  a  period  of  time.  Connect  the  test  leads,  select  the  test  current  and  press  the  TEST  button.  DLRO600  will  pass  a  current continuously, and measure the resulting voltage at 2- second intervals, until the test button is pressed to stop the test or the test circuit is interrupted.

In NORMAL mode you connect the leads, select the test current and press the TEST button. The test current will ramp up to the desired level,  hold  for  2  seconds  and  then  ramp  down.  The  whole  process  takes approximately 7 seconds.

In AUTO mode select the desired current, connect the current leads and press the TEST button. The TEST lamp will flash to show that the DLRO600 is ready to carry out a test. As soon as the potential leads are connected, a test will start. To repeat a test, simply break contact with the voltage probes and remake contact.

Measuring  individual  joints  in  a  busbar  is  a  good  example  of  the  convenience  to  be  gained  by  using  AUTO  mode.  The  two  current  leads  are  connected  to  the  ends  of  the  busbar.  They  will  remain  connected  here  until  all  tests  have  been  completed.  When  the  voltage leads make contact across a joint, DLRO600 detects that all four leads are connected, carries out a test and stops.




Comparison Chart for: Megger DLRO600 Ducter Digital Low Resistance Ohmmeter - 600A

Test currents10 A-600 A10 A-200 A0-600 A0-600 A0-200 A5 A-600 A5 A-200 A50 A -220 A10 A - 100A
Current steps1 A1 A1 A1 A1 A
Max. test time continuous at>60 sec>10 min10 sec15 sec20 sec15 sec2 min3 sec - discharging10 min
Measurement range0.1 µΩ-999.9 mΩ0.1 µΩ-999.9 mΩ0-200 mΩ0-1999 µΩ0-19.99mΩ0-999.9 mΩ0-999.9 mΩ0-1000 mΩ0.1 µΩ-1.999Ω
Best resolution0.1 µΩ0.1 µΩ1.0 µΩ1.0 µΩ1.0 µΩ0.1 µΩ0.1 µΩ1.0 µΩ0.1 µΩ
Ripple free DC
DualGround100x / 100H
Remote control
Built-in printer
Result storage100X / 100H
Downloading to PC100X / 100H
Power supply
Rechargeable batteryoptional
Weight14.5 kg14.5 kg23.7 kg24.7 kg14.6 kg13.8 kg13.8 kg1.0 kg7.0 / 7.9 kg


Accessory Code Description Price (Ex VAT)
1001-653 USB - RS232 Adaptor £59.00 ADD
25955-025 Serial PC Download Lead £10.00 ADD
35871 USB-serial Adaptor £28.00 ADD
6220-756 10m Lead Set - 2 x 70mm 2 Current Leads with Clamps and 2 x Potential Leads with Clips £845.00 ADD
6220-757 15m Lead Set - 2 x 95mm 2 Current Leads with Clamps and 2 x Potential Leads with Clips £1,495.00 ADD