Earth Resistance and Resistivity Meters AMRU 120

AMRU 120

Earth resistance measurament with 3-pole,4-pole method, Earth resistance measurement without disconnecting measured earths (using clamp), Continuity of equipotential bondings and protecting conductors, Two clamps earth resistance measurement without auxiliary test probes, Earth resistivity measurement

It allows to take the measurements of:

  • Earth resistance using auxiliary electrodes
  • Earth resistance using auxiliary electrodes and clamp (for measurements of multiple earth)
  • Earth resistance using double clamps (for measurement of earthing when it is impossible to use auxiliary electrodes),
  • Ground resistivity (Wenner method),
  • 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 50 Hz, 60 Hz
  • Selection of maximum measuring voltage (25 V and 50 V)
  • Introducing the distance between the electrodes for the resistivity in metres (m)
  • Memory of 990 measurements (10 banks of 99 cells each)
  • Calibration of clamp used
  • Real time clock (RTC)
  • Data transmission to the computer (USB, wireless)
  • Indication of battery state

Measurement of interference voltage UN (RMS)

Range

Resolution

Accuracy

0...100V

1V

±(2% m.v. + 3 digits)

Singnalling overvoltage 24 V or 40 V rms

Measurement for DC and AC 45…65 Hz

Measurement of continuity of equipotential bondings and protective conductors (Rcont)

Measurement range to IEC61557-5: 0,24Ω...19,9kΩ

Range

Resolution

Accuracy

0,00...19,99Ω

0,01Ω

±(2% m.v. + 2 digits)

20,0...199,9Ω

0,1Ω

200...1999Ω

2,00k...9,99kΩ

10Ω

±(5% m.v. + 2 digits)

10,0k...19,9kΩ

100Ω

2-pole method

Voltage on open terminals: <24 Vrms but >4 Vrms

Measurement current: under short circuit >200 mA

Frequency of measurement current: 125 (for networks 50 Hz) or 150 Hz (for networks 60 Hz), possible choice of measurement frequency in menu

Auto-zero function measurement leads

 

“m.v.” – measured value

Measurement of earth resistance (method 3- and 4-pole)

Measurement range to IEC61557-5: 0,30Ω...19,9kΩ

Range

Resolution

Accuracy

0,00...19,99Ω

0,01Ω

±(2% m.v. + 2 digits)

20,0...199,9Ω

0,1Ω

200...1999Ω

±(5% m.v. + 4 digits)

2,00k...9,99kΩ

10Ω

10,0k...19,9kΩ

100Ω

3-pole,4-pole method

Measurement current: under short circuit >200 mA

Voltage on open terminals: selectable <25 V AC or <50 V AC

Frequency of measurement current: 125 (for networks 50 Hz) or 150 Hz (for 60 Hz)

Measurement of resistance of auxiliary electrodes RH and RS

Range

Resolution

Accuracy

0...999Ω

±(5% (RS +RE +RH ) + 8 digits)

1,00kΩ...9,99kΩ

10Ω

10,0kΩ...19,9kΩ

100Ω

Reading of values measured for the electrodo will be in the right side of display RH and RS (separated part of display)

Measurement of multiple earth resistance with using the clamp and auxiliary electrodes (3p + clamp)

Measurement range to IEC61557-5: 0,44Ω...1999Ω

Range

Resolution

Accuracy

0,00...19,99Ω

0,01Ω

±(8% m.v. + 3 digits)

20,0...199,9Ω

0,1Ω

200...1999Ω

3-pole,4-pole method

Measurement current: under short circuit >200 mA

Voltage on open terminals: selectable <25 V AC or <50 V AC

Frequency of measurement current: 125 (for networks 50 Hz) or 150 Hz (for 60 Hz)

Measurement of ground resistivity. Measurement method: Wenner, p=2πLRE

Range

Resolution

Accuracy

0,00...199,9Ωm

0,1Ωm

depending on measurement
 accuracy RE with 4p method, but not les than ±1 digit

200...1999Ωm

1Ωm

2,00k...19,99kΩm

10Ωm

20,0k...99,9kΩm

100Ωm

100k...999kΩm

1kΩm

L – distance between probes: 1...50m

Measurement of multiple earth resistance with using double clamps

Range

Resolution

Accuracy

0,00...19,99Ω

0,01Ω

±(10% m.v. + 3 digits)

20,0...149,9Ω

0,1Ω

±(20% m.v. + 3 digits)

Double clamps method

Frequency of measurement current: 125 (for networks 50 Hz) or 150 Hz (for 60 Hz)

                                                                                                       AMRU-120 Specifications                                                                         

Electric security:

Type of insulation

Double, according to EN 61010-1 and IEC 61557

Measurement category

CAT III 600V acc. to EN 61010-1

Protection class acc. to EN 60529

IP54

Other technical data:

Display

LCD graphic, backlighted

Interface

USB, wireless

Number of measurements carried out of set of batteries

> 500

Warranty

36 months

Rated operational conditions:

Operation temperature

-10...+50°C

Storage temperature

-20...+70°C

Humidity

20...80%

Standard accesories:

  • Test lead on a reel; 50 m; yellow
  • Test lead on a reel; 25 m; red
  • Test lead on a reel; 25 m; blue
  • Pin probe with banana connector; yellow
  • Test lead with banana plug; 1,2m; yellow
  • Test lead with banana plugs 2,2m; black
  • Crocodile clip K01; black
  • Earth contact test probe (rod); 0,30m - 4 pcs.
  • Carrying case L2
  • USB transmission cable
  • Ni-MH battery package 4,8V 3Ah
  • Power supply adaptor Z7
  • Cable for battery charger
  • Hanging straps
  • Calibration certificate
  • Operating manual

Optional accesories:

  • Software for creation of documentation
  • Software for creation drawings and diagrams
  • USB key for software
  • Crocodile clip K02; black
  • Earth contact test probe (rod); 0,80m
  • Test2 wire lead with banana plug; 2m
  • Carrying case L3
  • Current clamps C-3(Ø=52mm)
  • Current clamps N-1(Ø=52mm)
  • Ni-MH battery package 4,8V 4,2Ah
  • Cramp
  • Battery case LR14 (size C)
  • Charger for battery loading from the socket car lighter (12V)
  • USB radio interface OR-1
Use of Earth Resistance and Resistivity Meters AMRU 120Using Earth Resistance and Resistivity Meters AMRU 120

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