Material-Surface-Metall & Sheet Testers
MR5-200C MICRO-OHMMETER
featuring continuous measurement current up to 200 A
The MICRO-OHMMETER MR5-200C is used to determine electric resistances on very low – resistance objects (e. g. bus bars, any connectors) while using a very high, continous flowing measurement current. The MR5-200C is able to generate a stable maximum current up to 200 A.
Under normal conditions, the electric resistance can be determined using a much lower current. For example, our MICRO-OHMMETER MR300C-A has a 10A measurement current with a resolution of 10nW (10-8W). However, faulty connections can not be found this way, as a high current is needed to determine the dissipation causing unstable or rising measurement values on bad connections.
To perform this a high measurement current of the MR5- 200C can be generated constantly over longer periods. Additionally, the measurement values can be send to any PC based spreadsheet program e.g. EXCEL© using the integrated interface. Time based sending is also supported, e.g. when evaluating the dissipation, measurement values are sent via interface with one second time gap.
| TEST CURRENT | max. 200A (True DC). Increment 1 A. Adjustable and presetable from 0 to 100% |
| 0-199.9 µΩ (test current: up to 200 A). 0-1.999 mΩ (test current: up to 200 A). 0-19.99 mΩ (test current: up to 100 A). 0-199.9 mΩ (test current: up to 20 A). 0-1999 mΩ (test current: up to 2 A). |
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| READING RESOLUTION | 0.1 μΩ for R < 200 μΩ. 1 μΩ for R < 2000 μΩ. 10 μΩ for R < 20 mΩ. |
| OUTPUT VOLTAGE | 4..5 Vdc @ all currents. |
| DISPLAY | 4 digits result, current and time LCD 9mm character height with backlight |
| TOTAL RESISTANCE | max. 20 mΩ @ 200A. max. 40 mΩ @ 100A. |
| MEASUREMENT PRINCIPLE | Four-terminal due to Kelvin |
| Protects the instrument from overheating. | |
| CONTINUOUS OPERATION TIME | At 200 A this device should not be used continously for more than 30 minutes (overheat protected). At 100 A the measuring time is unlimited. |
| BASIS ACCURACY | ± 0.3 % of reading ± 0.1 % of Range. |
| CURRENT FLOW DURATION | The duration (time) for steady current flow can be easily set to 1,2,5,10,20s. ....up to 600s or unlimited (o.h. protected). |
| ADVANCED FEATURES | Digital direct reading of resistance, current, measuring time and updated every second |
| BUILT-IN MEMORY | Storage of 1000 test readings. |
| INTERFACE | RS232 @ 2400, 4800, 9600 baud. , USB-B |
| ENVIRONMENTAL PROTECTIONS | IP54 (with closed lid). |
| SAFETY CLASS | Meets the requirements of IEC 61010-1:1990, IEC 61010-1:1992 amendment 2. |
| POWER SUPPLY | 90~264 VAC - 47~63Hz / 127~370VDC |
| OPERATING TEMPERATURE | -5°C to 50°C. |
| STORAGE TEMPERATURE | -40°C to 85°C. |
| HUMIDITY RANGE | 10~95 % of RH (non condensing). |
| EQUIPMENT WEIGHT | Approx. 9.5 kg. (without cables) |
| DIMENSIONS | 410W x 330D x 180H mm. |
| PRINTER | Thermal printer |
All technical datas are evaluated with 5 m Standard Measuring Cables, 100 µΩ test resistance, 230V line source, at 23°C room temperature.
This instrument can be delivered as MR5-200P version too. There are two main differences between the MR5-200C and the MR5-200P:
The C-Version uses continuous measuring current, the P-Version offers only a current duration of one second maximal. On the other hand the P-Version can be used for short time measurements without line connection, the C-Version needs line source for all operation modes.
| MR5-200C | MR5-200P | |
| Current flow | up to 1 h cont. | 3 s at 200 A |
| Battery operation | no | yes |
| Max. Measurements | no limit | 100 @ 200A battery only |
| Weight | 9.5 kg | 10.5 kg |
| Inductive objects | only small loads | no inductive loads |
All other technical datas and features are identical.
