
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.
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Multiple measurement possibilities:
- earth resistance using auxiliary electrodes,
- earth resistance using auxiliary electrodes and current clamp for measurements of multiple earth ground points
- earth resistance using double current clamps for measurement of earth ground when it is impossible to use electrodes in the ground
- impulse earth impedance for lightning without disconnecting measured earthing
- ground resistivity (Wenner method),
- current using current clamp (e.g. leakage) and flexible current probe (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),
- indication of battery state.
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: 14F to 122F / -10 to +50°C
- storage temperature: -4F to 158F / -20 to +70°C
- humidity: 20 to 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 to 100 V | 1 V | ±(2% m.v. + 3 digits) |
Measurement of interference frequency
Range | Resolution | Accuracy |
15 to 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 to 19.9 kΩ
Range | Resolution | Accuracy |
0.000 to 3.999 Ω | 0.001 Ω | ±(2% m.v. + 4 digits) |
4.00 to 39.99 Ω | 0.01 Ω | ±(2% m.v. + 2 digits) |
40.0 to 399.9 Ω | 0.1 Ω | |
400 to 3,999 Ω | 0.001 kΩ | |
4.00k to 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 to 19.99 kΩ
Range | Resolution | Accuracy |
0.000 to 3.999 Ω | 0.001 Ω | ±(2% m.v. + 4 digits) |
4.00 to 39.99 Ω | 0.01 Ω | ±(2% m.v. + 2 digits) |
40.0 to 399.9 Ω |
0.1 Ω |
|
400 to 3,999 Ω | 0.001 kΩ | |
4.00k to 19.99 kΩ | 0.01 kΩ | ±(5% m.v. + 2 digits) |
Measurement of resistance of auxiliary electrodes RH and RS
Range | Range | Accuracy |
0 to 999 Ω | 1 Ω | ±(5% (RS+RE+RH) + 8 digits) |
1.00k to 9.99 kΩ | 0.01 kΩ | |
10.0k to 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 to 3.999 Ω* | 0.01 Ω | ±(8% m.v. + 4 digits) |
10.0 to 99.9 Ω | 0.01 Ω | ±(8% m.v. + 3 digits) |
100 to 999 Ω | 0.1 Ω | |
1.00k to 1.99 kΩ | 1 Ω |
* - in range 0.000 to 0.045 Ω the accuracy is not specified.
Measurement of multiple earthing resistance with using double clamps
Range | Resolution | Accuracy |
0.00 to 19.99 Ω | 0.1 Ω | ±(10% m.v. + 3 digits) |
20.0 to 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 to 199.9 Ωm | 0.1 Ωm | depending on measurement
accuracy RE with 4p method, but not less than ±1 digit |
200 to 1999 Ωm | 1 Ωm | |
2.00k to 19.99 kΩm | 0.01 kΩm | |
20.0k to 99.9 kΩm | 0.1 kΩm | |
100k to 999 kΩm | 1 kΩm |
L – distance between probes: 1 to 150 ft / 1 to 50 m
Measurement of AC current (leakage)
Range | Resolution | Accuracy |
0.1 to 99.9 mA 1 | 0.1 mA | ±(8% m.v. + 5 digits) |
100 to 999 mA 1 | 1 mA | ±(8% m.v. + 3 digits) |
1.00 to 4.99 A 1,2 | 0.01 A | ±(5% m.v. + 5 digits)1
unspecified 2 |
5.00 to 9.99 A 1,2 | 0.01 A | ±(5% m.v. + 5 digits) |
10.0 to 99.9 A 1,2 | 0.1 A | |
100 to 300 A 1,2 | 1 A |
1 – receiving clamp (diameter 2" / 52 mm) – C-3
2 – flexible clamp (Rogowsky coil): F-1 diameter 14" / 360 mm; F-2: diameter 9" / 235 mm; F-3: diameter 4.7" / 120 mm
Measurement of dynamic earthing resistance (RD) with impulse wave method (4p )
Range | Resolution | Accuracy |
0.0 to 99.9 Ω | 0.1 Ω | ±(2,5% m.v. + 3 digits) |
100 to 199 Ω | 1 Ω |
choice impulse edges: 4/10μs, 8/20μs, 10/350μs
„m.v.”- measured value