| Micro Ohmmeter RMO400A |
Brochure RMO400A 
Print this page 
|
- Lightweight - only 7,5 kg
- Powerful 5 A - 400 A DC
- Measuring range 0 – 999,9 mΩ
- Resolution to 0,1 µΩ
- SINGLE / CONTIN Mode
- Mechanical protection IP43
|
| High DC current resistance meter |
| Description |
RMO400A is a Micro Ohmmeter based on state of the art technology, using the most advanced switch mode technique available today. RMO400A generates true DC current with automatically regulated test ramps. During the test RMO400A 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 RMO400A instrument can store up to 100 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 RMO400A 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 RMO400A at 230 V Mains Supply. A reduced output is available from lower supply voltages. |
| 230 V AC |
400 A DC smoothed |
5,6 V DC |
| |
200 A DC smoothed |
6,0 V DC |
| 115 V AC |
400 A DC smoothed |
4,0 V DC |
| |
200 A DC smoothed |
6,0 V DC |
|
Output current is filtered and has a ripple of less than 1 %. The RMO400A 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 |
| RMO400A 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 (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
|
| Accessories |
| Included |
- DV-Win PC software
- Mains power cable
- Ground (PE) cable
|
| Recommended |
- Current cables 2 x 5 m 35 mm2 with battery clips
- Sense cables 2 x 5 m with alligator clips
- Transport bags
|
 |
 |
 |
| Voltage sense cables |
Current cables |
Extension cable |
|
| Optional |
- Built-in thermal printer
- Transport case
- 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 with alligator clips
- Sense cables 2 x 15 m with alligator clips
|
| |
 |
 |
 |
| Transport bags |
Shunt |
Transport case |
|
| |
| Connecting a Test Object to RMO400A |
| With RMO400A turned off, connect RMO400A 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. |
 |
|
| Technical data |
| 1 Mains Power Supply |
|
| - Voltage |
110 – 230 V AC |
| - Frequency |
50 – 60 Hz |
| - Input power |
3250 VA (230 V AC); 2300 VA (110 V AC) |
| - Fuse |
15 A / 230 V, type F |
| 2 Output data |
|
| - Test current |
5 A - 400 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 - +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 |
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 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 |
| - Immunity |
EN 61326-1 |
|
| |