DLRO600 Digital Microhmmeter with English Keyboard
Megger DLRO600 measures resistances between 0.1 μΩ and 1 Ω, at high currents.
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.
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
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.