Earth Resistance and Resistivity Meters AMRU-200

The AMRU-200 Telometer from Amperis is the only meter on the market that implements all measurement methods: measurement can be carried out using the 2, 3 or 4 pole technical method, using the impulse method (4 / 10μs, 8 / 20μs, 10 / 350μs), measurements by the double clamp method without the need to place auxiliary electrodes and allows to measure the resistivity of the soil, as well as a pulse test.

It is important to highlight the version of the equipment with built-in GPS: the AMRU-200-GPS. The measurement GPS coordinates are stored in the device's memory, later they can be transferred to the computer with the USB cable. The advantage of this equipment with integrated GPS is that all the measurements are geolocated, knowing the coordinates of them, which is very useful when many measurements are made.

 

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),
• Current using the clamp (e.g. leakage) and flexible clamp (Rogowsky coils)
• 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, wireless)
• Indication of battery state

Measurement of interference voltage UN (RMS)
Range	Resolution	Accuracy
0...100V	1V	±(2% m.v. + 3 digits)

Measurement of interference frequency
Range	Resolution	Accuracy
15...450Hz	1Hz	±(1% m.v. + 2 digits)

Measurement of continuity of equipotential bondings and protective conductors (Rcont)
Measurement range to IEC61557-5: 0,045Ω...19,9kΩ
Range	Resolution	Accuracy
0,00...3,99Ω	0,001Ω	±(2% m.v. + 4 digits)
4,0...39,9Ω	0,01Ω	±(2% m.v. + 2 digits)
40...399Ω	0,1Ω
400...3999Ω	1Ω
4,0k...19,9kΩ	10Ω	±(5% m.v. + 2 digits)

Measurement of dynamic earthing resistance ( RD ) with impulse wave method (4p )
Range	Resolution	Accuracy
0,0...99,9Ω	0,1Ω	±(2,5% m.v. + 3 digits)
100...200Ω	1Ω

Measurement of earth resistance (method 3- and 4-pole)
Measurement range to IEC61557-5: 0,10Ω...19,9kΩ
Range	Resolution	Accuracy
0,000...3,999Ω	0,001Ω	±(2% m.v. + 4 digits)
4,0...39,99Ω	0,01Ω	±(2% m.v. + 2 digits)
40,0...399,9Ω	0,1Ω
400...3999kΩ	1Ω
4,00kΩ...19,99kΩ	10Ω	±(5% m.v. + 2 digits)

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

Measurement of multiple earth resistance with using the clamp and auxiliary electrodes (3p + clamp)
Measurement range to IEC61557-5: 0,12Ω...1999Ω
Range	Resolution	Accuracy
0,00...3,99Ω	0,001Ω	±(8% m.v. + 4 digits)
4,00...39,99Ω	0,01Ω	±(8% m.v. + 3 digits)
40,0...399,9Ω	0,1Ω
400...1999Ω	1Ω

Measurement of ground resistivity. Method: Wenner, p=2πLRE
Range	Resolution	Accuracy
0,00...199,9Ωm	0,1Ωm	depending on measurement accuracy RE with 4p method, but not less than ±1 digit
200...1999Ωm	1Ωm
2,00k...19,99kΩm	10Ωm
20,0k...99,9kΩm	100Ωm
100k...999kΩm	1kΩm

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)

Measurement of AC current (leakage)
Range	Resolution	Accuracy
0,1...99,9mA 1	0,1mA	±(8% m.v. + 5 digits)
100...999mA 1	1mA	±(8% m.v. + 3 digits)
1,00...4,99A 1	0,001A	±(5% m.v. + 5 digits) 1
5,00...9,99A 1,2	0,01A	±(5% m.v. + 5 digits)
10,0...99,9A 1,2	0,1A
100...300A 1,2	1A
1-receiving clamp (diameter 52 mm) – C-3
2-flexible clamp (Rogowsky coil) with diameter 400 mm – F-1
“m.v.” – measured value

AMRU-200 Specifications
Electric security:
Type of insulation	Double, according to EN 61010-1 and IEC 61557, EMC
Measurement category	CAT III 600V acc. to EN 61010-1
Protection class acc. to EN 60529	IP54
Otros datos técnicos:
Display	LCD graphic, backlighted
Interface	USB
Number of measurements carried out of set of batteries	> 300
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
• Test lead with banana plug; 1,2m; yellow
• Test lead with banana plugs 2,2m; black
• USB transmission cable
• Charger for battery loading from the socket car lighter (12V)
• Earth contact test probe (rod); 0,30m - 4 pcs.
• Carrying case L2
• Crocodile clip K01; black
• Crocodile clip K02; black
• Ni-MH battery package 4,8V 4,2Ah
• Cramp
• Cable for battery charger
• Power supply adaptor Z7
• Hanging straps
• Calibration certificate
• Operating manual

Optional accesories:

• Software for creation of documentation
• Earth contact test probe (rod); 0,80m
• Current clamps N-1(Ø=52mm)
• Test2 wire lead with banana plug; 2m
• Current clamps C-3(Ø=52mm)
• Battery case LR14 (size C)
• Carrying case L3
• Hard carrying case
• Current flexible clamp (Rogowsky coil) F-1 (Ø=400mm)