| Micro OhmMeter RMO500G |
Brochure RMO500G 
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- Lightweight - only 9 kg
- Powerful 5 A - 500 A DC
- Measuring range 0 – 999,9mΩ
- Resolution to 0,1 µΩ
- SINGLE / CONTIN Mode
- True DC current
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| High DC current resistance meter |
| Description |
RMO500G is a Micro Ohmmeter based on state of the art technology, using the most advanced switch mode technique available today. RMO500G generates true DC current with automatically regulated test ramps. During the test RMO500G 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 RMO500G instrument can store up to 500 measurements. All measurements are time and date stamped. Using DV-Win software a test can be performed from a PC, and the results can be obtained directly at a PC. Using DV-Win 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 RMO500G 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 RMO500G at 230V Mains Supply. A reduced output is available from lower supply voltages. |
| 230 V AC |
500 A DC smoothed |
5,25 V DC |
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300 A DC smoothed |
6,0 V DC |
| 115 V AC |
500 A DC smoothed |
3,0 V DC |
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300 A DC smoothed |
5,0 V DC |
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Output current is filtered and has a ripple of less than 1 %. The RMO500G current output is rated at 500 A for 30 seconds, at 300 A for 90 seconds and 200 A for 2,5 minutes at 25 °C ambient temperature. |
| CONTIN Mode |
| RMO500G 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 (DV-Win) each second. Using DV-Win 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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| Accessories |
| Included |
- DV-Win PC software
- Mains power cable
- Ground (PE) cable
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| Recommended |
- Current cables 2 x 5 m 25 mm2 with battery clips
- Sense cables 2 x 5 m with alligator clips
- Cable bag
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| Voltage sense cables |
Current cables |
Extension cable |
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| Optional |
- Built-in thermal printer
- Remote control unit
- Both sides grounded unit
- Test shunt 100 µΩ
- Current cables 2 x 10 m 50 mm2 with battery clips
- Current cables 2 x 15 m 70 mm2 with battery clips
- Extension cable 2 x 10 m 70 mm2
- Sense cables 2 x 10 m with alligator clips
- Sense cables 2 x 15 m with alligator clips
- Cable plastic case
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| Connecting a Test Object to RMO500G |
| With RMO500G turned off, connect RMO500G 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 RMO500G with current clamp meter it is possible to make safer measurement of breakers with both terminals 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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| - Voltage |
110 – 230 V AC |
| - Frequency |
50 – 60 Hz |
| - Input power |
3800 VA (230 V AC); 2300 VA (110 V AC) |
| - Fuse |
15 A / 230 V, type F |
| 2 Output data |
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| - Test current |
5 A - 500 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 - +55 °C / 14 F - 131 F |
| - Storage temperature -40°C - +70 °C / 40 F - 158 F |
| - Maximum relative humidity 95 % non-condensing |
- Mains supply voltage fluctuations up to ±10 % of the nominal voltage |
- Installation/overvoltage category II |
- Pollution degree 2 |
| 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 |
9 kg/19,8 lb |
| 5 Warranty |
three years |
| 6 Safety Standards |
| - European standards |
EN 61010-1
LVD 2006/95/EC |
| - International standards |
IEC 61010-1
UL 61010-1
CAN/CSA-C22.2 No. 61010-1, 2nd edition, including Amendment 1 |
| 7 Electromagnetic Compatibility (EMC) |
| - CE conformity |
EMC standard 89/336/EEC
EMC directive 2004/108/EC |
| - Emission |
EN 61326-1 |
| - Interference Immunity |
EN 61326-1 |
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