Home » DV Power RMO300 High DC Current Resistance MicroOhmMeter
DV Power RMO300 High DC Current Resistance MicroOhmMeter
RMO300 is a micro-ohmmeter based on state of the art technology, using the most advanced switch mode technique available today. RMO300 generates true DC current with automatically regulated test ramps. During the test RMO300 ramps with increasing current before measuring and decreasing current after the measurement. This eliminates magnetic transients.
After the test current has been set, the automatic test procedure is started by pressing the Ω-button. The test result is displayed as R=U/I. There is enough memory in RMO300 to store 100 measurements. All measurements are time and date stamped. They can also be exported to a PC with RMO-Win software. The software connects a PC to RMO300 with a RS232 cable. The RMO-Win makes it easy to report and analyse all results.
RMO300 has very high ability to cancel electrostatic and electromagnetic interference in high HV electric fields. It is achieved by very efficient filtration. The filtration is made utilizing appropriate hardware and software.
Output Ratings
The full output is available from the RMO300 for a 230V+10%-15% supply. A reduced output is available from lower supply voltages.
Supply Voltage Output Current Full Load Voltage
230 V AC 300 A DC 5,8 V DC
200 A DC 6,0 V DC
115 V AC 300 A DC 5,0 V DC
200 A DC 6,0 V DC
Output current is filtered and has a ripple of less then 1%.
CONT Mode
RMO300 can generate DC current continuously using the CONT menu. In this menu the current can be chosen the same way like in the SINGLE menu, but the duration of the test can be preset. The test is started pressing the Ω-button. During the test, a new result is shown on the display and stored into the PC (RMOWin) each second. Using RMOWin the result can be printed like an Excel table which later can be shown as a diagram and used for a report.
Typical application is measuring resistance of:
After the test current has been set, the automatic test procedure is started by pressing the Ω-button. The test result is displayed as R=U/I. There is enough memory in RMO300 to store 100 measurements. All measurements are time and date stamped. They can also be exported to a PC with RMO-Win software. The software connects a PC to RMO300 with a RS232 cable. The RMO-Win makes it easy to report and analyse all results.
RMO300 has very high ability to cancel electrostatic and electromagnetic interference in high HV electric fields. It is achieved by very efficient filtration. The filtration is made utilizing appropriate hardware and software.
Output Ratings
The full output is available from the RMO300 for a 230V+10%-15% supply. A reduced output is available from lower supply voltages.
Supply Voltage Output Current Full Load Voltage
230 V AC 300 A DC 5,8 V DC
200 A DC 6,0 V DC
115 V AC 300 A DC 5,0 V DC
200 A DC 6,0 V DC
Output current is filtered and has a ripple of less then 1%.
CONT Mode
RMO300 can generate DC current continuously using the CONT menu. In this menu the current can be chosen the same way like in the SINGLE menu, but the duration of the test can be preset. The test is started pressing the Ω-button. During the test, a new result is shown on the display and stored into the PC (RMOWin) each second. Using RMOWin the result can be printed like an Excel table which later can be shown as a diagram and used for a report.
Typical application is measuring resistance of:
- high, middle and low voltage circuit breakers
- high, middle and low voltage disconnecting switches
- high-current bus bar joints
- cable splices
- welding joints
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Full Review
- Lightweight - only 7 kg
- Powerful - 5A-300A DC
- Measuring range 0 - 999 mΩ
- Resolution to 0,1 µΩ
- SINGLE/CONT Mode
- Mechanical protection IP54
1 Mains Power Supply
Connection according to IEC/EN60320-1; UL498, CSA 22.2
Mains supply from 90 V to 264 V AC; 50-60 Hz
2 Output data
Test current 5 A - 300 A DC
Measuring range Resolution
0,1µΩ - 999,9µΩ 0,1 µΩ
1,000mΩ - 9,999mΩ 1 µΩ
10,00mΩ - 99,99mΩ 10 µΩ
100,0mΩ - 999,9mΩ 0,1 mΩ
Typical accuracy ±(0,2% rdg + 0,2% FS)
3 Environment conditions
Operating temperature -10°C - +50°C / 14°F - +122°F
Storage and transportation -25°C - +70°C / -13°F - +158°F
Humidity 5% - 95% relative humidity, non condensing
4 Dimensions and Weight
Dimensions 198 mm x 255 mm x 380 mm (7,8 in x 10 in x 15 in) (W x H x D) without handle
Weight 7,5 kg/16,5 lb
5 Mechanical protection IP54
6 Warranty two years
7 Safety Standards
European standards EN 61010-1
International standards IEC 61010-1
UL 3111-1
CAN/CSA-C22.2 No 1010.1-92
8 Electromagnetic Compatibility (EMC)
CE conformity EMC standard 89/336/EEC
Emission EN 50081-2, EN 61000-3-2/3
Interference Immunity EN 50082-2
Connection according to IEC/EN60320-1; UL498, CSA 22.2
Mains supply from 90 V to 264 V AC; 50-60 Hz
2 Output data
Test current 5 A - 300 A DC
Measuring range Resolution
0,1µΩ - 999,9µΩ 0,1 µΩ
1,000mΩ - 9,999mΩ 1 µΩ
10,00mΩ - 99,99mΩ 10 µΩ
100,0mΩ - 999,9mΩ 0,1 mΩ
Typical accuracy ±(0,2% rdg + 0,2% FS)
3 Environment conditions
Operating temperature -10°C - +50°C / 14°F - +122°F
Storage and transportation -25°C - +70°C / -13°F - +158°F
Humidity 5% - 95% relative humidity, non condensing
4 Dimensions and Weight
Dimensions 198 mm x 255 mm x 380 mm (7,8 in x 10 in x 15 in) (W x H x D) without handle
Weight 7,5 kg/16,5 lb
5 Mechanical protection IP54
6 Warranty two years
7 Safety Standards
European standards EN 61010-1
International standards IEC 61010-1
UL 3111-1
CAN/CSA-C22.2 No 1010.1-92
8 Electromagnetic Compatibility (EMC)
CE conformity EMC standard 89/336/EEC
Emission EN 50081-2, EN 61000-3-2/3
Interference Immunity EN 50082-2
Product brochures
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