| Micro Ohmmeter RMO200A |
Brochure RMO200A 
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- Lightweight - only 7 kg
- Powerful 2 A - 200 A DC
- Measuring range 0 – 999,9 mΩ
- Resolution to 0,1 µΩ
- SINGLE / CONTIN Mode
- Mechanical protection IP43
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| High DC current resistance meter |
| Description |
RMO200A is a Micro Ohmmeter based on state of the art technology, using the most advanced switch mode technique available today. RMO200A generates true DC current with automatically regulated test ramps. During the test RMO200A 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 RMO200A instrument can store up to 100 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 RMO200A 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 RMO200A at 230 V or 115 V Mains Supply. |
| 230 V AC |
200 A DC smoothed |
5,5 V DC |
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100 A DC smoothed |
6,0 V DC |
| 115 V AC |
200 A DC smoothed |
5,0 V DC |
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100 A DC smoothed |
6,0 V DC |
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| Output current is filtered and has a ripple of less then 1 %. The RMO200A current output is rated at 200 A for 2,5 minutes, and 100 A for 5 minutes at 25 °C ambient temperature. |
| CONTIN Mode |
| RMO200A 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 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 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 25 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
- Transport bags
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| Voltage sense cables |
Current cables |
Extension cable |
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| Optional accessories |
- Built-in thermal printer
- Transport case
- Test shunt 100 µΩ
- Current cables 2 x 10 m 25 mm2 with battery clips
- Current cables 2 x 15 m 35 mm2 with battery clips
- Extension cable 2 x 10 m 35 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
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| Transport bags |
Shunt |
Transport case |
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| Connecting a Test Object to RMO200A |
| With RMO200A turned off, connect RMO200A 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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| Technical data |
| 1 Mains Power Supply |
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| - Connection |
according to IEC/EN60320-1; UL498, CSA 22.2 |
| - Mains supply |
100 - 130 V AC or 200 - 264 V AC; 50 - 60 Hz |
| 2 Output data |
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| - Test current |
2 A - 200 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 |
± (0,25 % rdg + 0,25 % 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 |
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 |
7,0 kg/15,4 lb |
| 5 Mechanical protection |
IP43 |
| 6 Warranty |
three years |
| 7 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 |
| 8 Electromagnetic Compatibility (EMC) |
| - CE conformity |
EMC standard 2004/108/EC |
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