The Megger DLRO600 is a 600 A micro-ohmmeter that 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 DC subject to the load resistance and supply voltage and uses a four-terminal measurement technique to cancel the resistance of the test leads from the measurement.
The unique design of the DLRO600 allows the weight and size to be kept to a minimum - the instrument weighs less than 15 kg. This small size makes the DLRO600 useful in a range of different environments and its high current capability and compact design make it suitable for testing circuit breaker contacts, switch contacts, busbar joints, and other applications where high current is required.
A large LCD screen provides all the information needed to perform a test all test parameters and measurement results are displayed. What s more, 300 sets of results may be stored in the DLRO600s on-board memory for later download to a PC or it can be output directly to a printer via the RS232 port. You may also add notes stored results by using the on-board alphanumeric keypad, making it easy to identify results later. Additionally, this keypad allows you to set the test current directly by typing in the value required. The 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.
Key Features
Small and weighs less than 33 lbs (15 kg)
Test currents from 10 A to 600 A DC
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 16.4 ft (5 m) test leads and download software
Specification
Measurement:
Range: 0.1 µΩ to 999.9 mΩ (Subject to supply voltage and leads used)
Accuracy: Voltage ±0.5% ± 0.1 mV
Current ±0.5% ± 0.1 A
Resistance: Better than 1% from 100 µΩ to 100 mΩ
Test Current Range:10 A to 600 A unsmoothed d.c. in 1 A steps
Output Current:
The chart above shows the maximum output current available at different supply voltages with a 4 mΩ load (i.e. standard 5 m current leads only) and with a 7 mΩ load
Current Lead Resistance (Megger supplied leads)
2 x 5 m 50 mm2 current leads 4 mΩ
2 x 10 m 70 mm2 current leads 5.4 mΩ
2 x 15 m 95 mm2 current leads 6 mΩ
Maximum Continuous Test Time
More than 60 seconds at 600 A at 20ºC ambient.
Power Supply for: See chart. full output: 207 to 265 V 50/60 Hz with a load less than 7 mΩ including current leads
reduced output: Down to 100 V 50/60 Hz.
Test Modes: Manual, Auto, Continuous.
Test Time: 7 seconds NORMAL /AUTO mode.
Refreshed every 2 seconds in CONTINUOUS mode
Display: Large, high resolution backlit liquid crystal display
Warnings Current flowing: - LED. Other warnings are shown on the lcd display.
Data Transfer Real time or batch download via RS232 using Download Manager.
Storage Capacity: 300 result sets and memo,battery backed for 10 years.
Memo field: 200 characters max.
Accuracy: ±2% ±2 A
Voltmeter input
impedance: >200 kΩ
Hum rejection: 5 V rms 50 Hz/60 Hz Operation Temperature: -10 to +50ºC Storage Temperature: -25 to +65ºC Calibration: 20ºC
Co-efficient: <0.05% per ºC
Max. Humidity: 95% RH non-condensing
Maxi Altitude: 2000 m
Safety: IEC61010-1
EMC: IEC61326-1
Dimensions: 410 x 250 x 270 mm
Weight: 14.5 kg (excluding test leads)