MRU-200
Earth Resistance and Resistivity Meter
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- Thông số Specs Details Overview Components Packages Resources Additional Modules Complementary products Architecture Tools Benefits Features Customer Ordering
MRU-200 is the only meter in the market which uses all measurement methods.
- earth resistance measurment with 2-pole, 3-pole,4-pole method,
- impulse earth impedance measurement, three kinds of measuring impulse 4/10μs, 8/20μs, 10/350μs,
- earth resistance measurement without disconnecting measured earths (using clamp),
- two clamps earth resistance measurement without auxiliary test probs,
- earth resistivity measurement,
- continuity measurement,
- leakage current measurement.
It allows to take the measurements of:
- earth resistance using auxiliary electrodes,
- earth resistance using auxiliary electrodes and clamp (for measurements of multiple earthing)
- earth resistance using double clamps (for measurement of earthing when it is impossible to use auxiliary electrodes),
- impulse earth impedance (without disconnecting measured earthing),
- ground resistivity (Wenner method),
- current using the clamp (e.g. leakage) and flexible clamp (Rogowsky coil),
- measurement of continuity of equipotential bondings and protective conductors (meeting the requirements of IEC 60364 – 6 – 61:2000 section 6.12.2) with auto-zero function – with current 200 mA.
Additionally:
- measurement of resistance of auxiliary electrodes RS and RH,
- measurement of interference voltage,
- measurement of interference frequency,
- measurement in the presence of interference voltage in the power network
with frequency 16 2/3 Hz, 50 Hz, 60 Hz and 400 Hz (with automatic selection of proper frequency of measuring signal or with manual selection), - selection of maximum measuring voltage (25 V and 50 V)
- introducing the distance between the electrodes for the resistivity in metres (m) and feet (ft),
- memory of 990 measurements (10 banks of 99 cells each),
- calibration of clamp used,
- real time clock (RTC),
- data transmission to the computer USB and Bluetooth*,
- indication of battery state.
*Bluetooth communication from serial number E30001
Electric security:
- type of insulation: double, according to EN 61010 – 1 and IEC 61557
- measurement category: CAT IV 300 V acc. to EN 61010 – 1
- protection class acc. to EN 60529: IP54
Rated operational conditions:
- operation temperature: -10…+50°C
- storage temperature: -20…+70°C
- humidity: 20…80%
Other technical data:
- LCD display: graphic, backlighted
- interface: USB
- number of measurements carried out of set of batteries: > 1200
- warranty: 24 months
Measurement of interference voltage
| Range | Resolution | Accuracy |
| 0…100 V | 1 V | ±(2% m.v. + 3 digits) |
Measurement of interference frequency
| Range | Resolution | Accuracy |
| 15…450 Hz | 1 Hz | ±(1% m.v. + 2 digits) |
Measurement of earthing resistance (method 3- and 4-pole)
measurement range to IEC61557 – 5: 0,100 Ω…19,9 kΩ
| Range | Resolution | Accuracy |
| 0,000…3,999 Ω | 0,001 Ω | ±(2% m.v. + 4 digits) |
| 4,00…39,99 Ω | 0,01 Ω | ±(2% m.v. + 2 digits) |
| 40,0…399,9 Ω | 0,1 Ω | |
| 400…3999 Ω | 0,001 kΩ | |
| 4,00k…19,99 kΩ | 0,01 kΩ | ±(5% m.v. + 2 digits) |
Measurement of continuity of equipotential bondings and protective conductors (Rcont)
measurement range to IEC61557 – 4: 0,045 Ω…19,99 kΩ
| Range | Resolution | Accuracy |
| 0,000…3,999 Ω | 0,001 Ω | ±(2% m.v. + 4 digits) |
| 4,00…39,99 Ω | 0,01 Ω | ±(2% m.v. + 2 digits) |
| 40,0…399,9 Ω | 0,1 Ω | |
| 400…3999 Ω | 0,001 kΩ | |
| 4,00k…19,99 kΩ | 0,01 kΩ | ±(5% m.v. + 2 digits) |
Measurement of resistance of auxiliary electrodes RH and RS
| Range | Range | Accuracy |
| 0…999 Ω | 1 Ω | ±(5% (RS+RE+RH) + 8 digits) |
| 1,00k…9,99 kΩ | 0,01 kΩ | |
| 10,0k…19,9 kΩ | 0,1 kΩ |
Measurement of multiple earthing resistance with using the clamp and auxiliary
electrodes (3p + clamp)
| Range | Resolution | Accuracy |
| 0,000…3,999 Ω* | 0,01 Ω | ±(8% m.v. + 4 digits) |
| 10,0…99,9 Ω | 0,01 Ω | ±(8% m.v. + 3 digits) |
| 100…999 Ω | 0,1 Ω | |
| 1,00k…1,99 kΩ | 1 Ω |
* – in range 0,000…0,045 Ω the accuracy is not specified.
Measurement of multiple earthing resistance with using double clamps
| Range | Resolution | Accuracy |
| 0,00…19,99 Ω | 0,1 Ω | ±(10% m.v. + 3 digits) |
| 20,0…149,9 Ω | 0,1 Ω | ±(20% m.v. + 3 digits) |
Measurement of ground resistivity Measurement method: Wennera, ρ=2πLRE
| Range | Resolution | Accuracy |
| 0,0…199,9 Ωm | 0,1 Ωm | depending on measurement accuracy RE with 4p method, but not less than ±1 digit |
| 200…1999 Ωm | 1 Ωm | |
| 2,00k…19,99 kΩm | 0,01 kΩm | |
| 20,0k…99,9 kΩm | 0,1 kΩm | |
| 100k…999 kΩm | 1 kΩm |
L – distance between probes: 1…50 m
Measurement of AC current (leakage)
| Range | Resolution | Accuracy |
| 0,1…99,9 mA 1 | 0,1 mA | ±(8% m.v. + 5 digits) |
| 100…999 mA 1 | 1 mA | ±(8% m.v. + 3 digits) |
| 1,00…4,99 A 1,2 | 0,01 A | ±(5% m.v. + 5 digits)1 unspecified 2 |
| 5,00…9,99 A 1,2 | 0,01 A | ±(5% m.v. + 5 digits) |
| 10,0…99,9 A 1,2 | 0,1 A | |
| 100…300 A 1,2 | 1 A |
1 – receiving clamp (diameter 52 mm) – C-3
2 – flexible clamp (Rogowsky coil) with diameter 400 mm – F-1
Measurement of dynamic earthing resistance (RD) with impulse wave method (4p )
| Range | Resolution | Accuracy |
| 0,0…99,9 Ω | 0,1 Ω | ±(2,5% m.v. + 3 digits) |
| 100…199 Ω | 1 Ω |
choice impulse edges: 4/10μs, 8/20μs, 10/350μs
„m.v.”- measured value
