| Micro Ohmmeter RMO300G |
Brochure RMO300G 
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- Lightweight - only 8,5 kg
- Powerful 2 A - 300 A DC
- Measuring range 0 – 999,9 mΩ
- Resolution to 0,1 µΩ
- SINGLE / CONTIN Mode
- True DC current
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| High DC current resistance meter |
| Description |
RMO300G is a Micro Ohmmeter based on state of the art technology, using the most advanced switch mode technique available today. RMO300G generates true DC current with automatically regulated test ramps. During the test RMO300G 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 START-button.
The RMO300G instrument can store up to 500 measurements. All measurements are time and date stamped. Using RMOWin software a test can be performed from a PC, and the results can be obtained directly at a PC. Using RMOWin the result can be arranged as an Excel spreadsheet which can be later shown as a diagram and printed for a report.
The set is equipped with thermal and overcurrent protection. The RMO300G has very high ability to cancel electrostatic and electromagnetic interference in HV electric fields. It is achieved by very efficient filtration. The filtration is made utilizing proprietary hardware and software. |
| Output Ratings |
| The full output is available from the RMO300G at 230 V Mains Supply. A reduced output is available from lower supply voltages. |
| 230 V AC |
300 A DC smoothed |
5,6 V DC |
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200 A DC smoothed |
6,0 V DC |
| 115 V AC |
300 A DC smoothed |
5,0 V DC |
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200 A DC smoothed |
6,0 V DC |
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Output current is filtered and has a ripple of less then 1 %. The RMO300G current output is rated at 300 A for 60 seconds, at 200 A for 150 seconds and 100 A for 5 minutes at 25 °C ambient temperature. |
| CONTIN Mode |
| RMO300G can generate DC current continuously using the CONTIN 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 START-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 arranged as an Excel spreadsheet which can be later shown as a diagram and printed for a report. |
| Application |
| 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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| Standard accessories |
- Current cables 2 x 5 m 35 mm2 with battery clips
- Sense cables 2 x 5 m 2,5 mm2 with alligator clips
- RMOWin PC software
- Mains power cable
- Ground (PE) cable
- Cable bag
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| Voltage sense cables |
Current cables |
Extension cable |
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| Optional accessories |
- Built-in thermal printer
- Remote control unit
- Both sides grounded unit
- Test shunt 100 µΩ
- Current cables 2 x 10 m 35 mm2 with battery clips
- Current cables 2 x 15 m 50 mm2 with battery clips
- Extension cable 2 x 10 m 50 mm2
- Sense cables 2 x 10 m 2,5 mm2 with alligator clips
- Sense cables 2 x 15 m 2,5 mm2 with alligator clips
- Cable plastic case
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| Connecting a Test Object to RMO300G |
| With RMO300G turned off, connect RMO300G to the test object (RX) in such a way that the measuring cables from the "Voltage Sense" sockets are attached as close as possible to RX, and in between the current feeding cables. That way, resistance of both cables and clamps is almost completely excluded from the resistance measurement. |
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| Remote Control Unit |
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The RMO Remote Control Unit is an optional control unit that is used to start and stop the tests from a remote location, away from the actual RMO. Provided that, for a series of tests, the same test current is fed through the test object, multiple measurements can be carried out with the RMO Remote Control Unit. |
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| Both Sides Grounded Unit |
| Using RMO300G with current clamp meter it is possible to make safer measurement of breakers with both sides of the breaker grounded. It is performed by measuring the current through the ground connection and reducing this value from the total current. |
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| Technical data |
| 1 Mains Power Supply |
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| - 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 |
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| - Test current |
2 A - 300 A DC |
| - Measuring range |
Resolution |
| 0,1 µΩ - 999,9 µΩ |
0,1 µΩ |
| 1,000 mΩ - 9,999 mΩ |
1 µΩ |
| 10,00 mΩ - 99,99 mΩ |
10 µΩ |
| 100,0 mΩ - 999,9 mΩ |
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 |
- 40 °C - + 70 °C / - 40 °F - + 158 °F |
| - Humidity |
5 % - 95 % relative humidity, non condensing |
| 4 Dimensions and Weight |
| - Dimensions |
410 mm x 180 mm x 320 mm
16,14 in x 7,08 in x 12,59 in
(W x H x D) without handle |
| - Weight |
8,5 kg/18,7 lb |
| 5 Warranty |
three years |
| 6 Safety Standards |
| - European standards |
LVD 2006/95/EC (EN 61010-1) |
| - International standards |
IEC 61010-1
UL 3111-1
CAN/CSA-C22.2 No 1010.1-92 |
| 7 Electromagnetic Compatibility (EMC) |
| - CE conformity |
EMC standard 2004/108/EC |
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