The Megger DLRO200-115 Digital Low Resistance Ohmmeter is an a.c. powered low resistance ohmmeter designed to measure d.c. resistances in the low milliohms or microhms using a maximum test current of 200 Amps d.c. The maximum test current available is dependent upon the power supply, the resistance of the test leads and the resistance of the item being tested.
Megger DLRO200-115 Digital Low Resistance Ohmmeter principle of operation
The required current is set before the test starts. When the TEST button is pressed, after a short delay the current increases to the set current, the voltage detected across the “P” leads is measured, and the current then reduces to zero.
Operation is controlled using the two-axis paddle and the menu system, which appears on the backlit liquid crystal display. The keyboard is used to set the desired test current and to add notes, which may be stored with test results in on board memory for later download via the RS232 socket provided. The measured resistance, the actual test current and measured voltage are clearly presented on the display after the test is complete.
Megger DLRO200-115 Specifications:
Range: 0.1 µΩ to 999.9 mΩ (Subject to supply voltage and leads used)
Voltage: ±0.5% ± 0.1 mV
Current: ±0.5% ± 0.1 A
Resistance: Better than 1% from 100 µΩ to 100 mΩ
Current Lead Resistance (Megger supplied leads)
2 x 16 ft (5 m) 25 mm2 current leads 8 mΩ
2 x 16 ft (5 m) 50 mm2 current leads 4 mΩ
2 x 33 ft (10 m) 70 mm2 current leads 5.4 mΩ
2 x 49 ft (15 m) 95 mm2 current leads 6 mΩ
Maximum Continuous Test Time
More than 10 minutes at 200 A @ 68° F (20º C) ambient.
Power Supply for full output (additional smoothed): 100 to 130 V 50/60 HZ with a load less than 11 mΩ including current leads
Test Modes: Manual, Auto, Continuous.
Test Time: 10 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: 160 characters max.
Range: Filtered direct current; 10 A to 200 A d.c.
Accuracy: ±2% ±2 A
Impedance: >200 kΩ
Hum rejection: 5 V rms 50 Hz/60 Hz
Operation: 14 to +122º F (-10 to +50º C)
Storage: -13 to 149º F (-25 to +65º C)
Calibration: 68° F (20º C)
Co-efficient: <0.05% per º C
Max. Humidity: 95% RH non-condensing
Maxi Altitude: 6562 ft. (2000 m)
Safety: IEC61010 – (1995)
EMC: EN61326 annex A (heavy industrial)
Dimensions: 16.4 x 9.84 x 10.63 in.(410 x 250 x 270 mm)
Weight: 31.97 lbs. (14.5 kg) excluding test leads