MRU - 200

Earth Resistance and Resistivity Meter

A true 3-phase analyzing reference standard with internal 3-phase current and voltage source capability.

he innovative design of the PowerMaster® 7 Series allows utilities to fully test a metering installation with one piece of equipment. Customer load meter testing, phantom load meter testing, CT burden and ratio testing, CT de-magnetization, PT ratio testing, and transducer testing can all be performed with one solution. In addition, vector diagrams, voltage and current waveforms, and harmonics data up to the 100th harmonic can all be analyzed to complete a true wiring verification.

Mobirise

Possible measurements:
• 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.
• CATIV 300V, CATIII 600V, IP54

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 measuring multiple earthing without underground connections,
• 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.

• 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

• operation temperature: -10...+50°C
• storage temperature: -20...+70°C
• humidity: 20...80%

• LCD display: graphic, backlighted
• interface: USB
• number of measurements carried out of set of batteries: > 1200

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) 
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 / ±(2% m.v. + 2 digits)
• 400...3999 Ω / 0,001 kΩ / ±(2% m.v. + 2 digits)
• 4,00k...19,99 kΩ / 0,01 kΩ / ±(5% m.v. + 2 digits) 

measurement range to IEC61557 - 5: 0,100 Ω...19,9 kΩ

Measurement of Continuity of Equipotential Bondings and Protective Conductors (Rcont) 
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 / ±(2% m.v. + 2 digits)
• 400...3999 Ω / 0,001 kΩ / ±(2% m.v. + 2 digits)
• 4,00k...19,99 kΩ / 0,01 kΩ / ±(5% m.v. + 2 digits)

measurement range to IEC61557 - 4: 0,045 Ω...19,99 kΩ

Measurement of Resistance of Auxiliary Electrodes RH and RS
Range / Resolution / Accuracy
• 0...999 Ω / 1 Ω / ±(5% (RS+RE+RH) + 8 digits)
• 1,00k...9,99 kΩ / 0,01 kΩ / ±(5% (RS+RE+RH) + 8 digits)
• 10,0k...19,9 kΩ / 0,1 kΩ / ±(5% (RS+RE+RH) + 8 digits)

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 / ±(8% m.v. + 3 digits)
• 1,00k...1,99 kΩ / 1 Ω / ±(8% m.v. + 3 digits)

* - 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*  / 0,1 mA / ±(8% m.v. + 5 digits)
100...999 mA* / 1 mA / ±(8% m.v. + 3 digits)
1,00...4,99 A*'**  / 0,01 A / ±(5% m.v. + 5 digits)* unspecified** 
5,00...9,99 A*'**  / 0,01 A / ±(5% m.v. + 5 digits)
10,0...99,9 A*'** / 0,1 A / ±(5% m.v. + 5 digits)
100...300 A*'** / 1 A / ±(5% m.v. + 5 digits)

* – receiving clamp (diameter 52 mm) – C-3
** – flexible clamp (Rogowski 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 / ±(2,5% m.v. + 3 digits)

choice impulse edges: 4/10μs, 8/20μs, 10/350μs
„m.v.”- measured value






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