Earth Resistance and Resistivity Meters 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	1Ω
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	1Ω	±(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	1Ω	±(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	1Ω
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 120

Earth Resistance and Resistivity Meters AMRU 120

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