AMRU-200 GPS
All earth-resistance measurement methods in a single meter, with coordinates and time stamped on every reading
Earth tester with built-in GPS
AMRU-200 GPS
Earth resistance and resistivity meter with built-in GPS
Earth tester with built-in GPS that brings together every earth-resistance and resistivity measurement method in a single portable meter.
Every method in a single meter
The AMRU-200 GPS measures earth resistance by the 2, 3 or 4-pole technical method, by the pulse method with three pulse slopes (4/10 μs, 8/20 μs and 10/350 μs) and with a double clamp with no auxiliary electrodes needed. It also measures soil resistivity by Wenner's method, current with clamps -including leakage currentand the continuity of compensating and protective connections with a self-neutralising function.
Measurement in the presence of disturbance voltage
The meter measures with disturbance voltage present on the network at 16 2/3 Hz, 50 Hz, 60 Hz or 400 Hz, with automatic or manual frequency selection, and the maximum measuring voltage can be set to 24 V or 50 V.
Auxiliary electrodes
- Measurement of the resistance of the RH and RS auxiliary electrodes, read on the right-hand side of the display, separate from the main result.
- Entry of the distance between electrodes for resistivity, in metres (m) or feet (ft).
- Calibration of the clamps used for each measurement.
Multiple-earth measurement without auxiliary electrodes, and satellite location for every point measured.
Multiple earths, double clamp and GPS positioning
Multiple earths with electrodes and clamps
The resistance of multiple earth connections is measured with auxiliary electrodes and clamps (3 wires + clamps), without needing to disconnect the earthing system being checked.
Double-clamp method
When auxiliary electrodes cannot be used, the AMRU-200 GPS measures earth resistance with two clamps placed on the same conductor, one for emission and one for reception, without disconnecting the installation.
Satellite positioning and real-time clock
The built-in GPS receiver stores the coordinates of each measurement in the meter's memory, together with the time stamp from the real-time clock (RTC). Every reading is therefore geo-located and dated automatically, which makes it easier to identify each electrode or rod on installations with many earthing points and to carry that information over into inspection reports without writing it down by hand.
Double-clamp measurement on an earth rod, without disconnecting the installation
Result memory
- Memory for 990 measurements, held in 10 banks of 99 cells.
- Battery energy indicator.
- Selection of the maximum measuring voltage between 24 V and 50 V.
Transfer to a PC of the measurements stored in memory, with their time stamp and coordinates, over a USB cable.
Software and data transmission
Transmission to the computer
The meter connects to a computer with a USB cable to transfer the measurements stored in the 10 memory banks, each with the time stamp from the real-time clock and, when the GPS receiver has stored the position, its coordinates. An optional accessory program for creating documentation builds inspection reports from that data, without re-entering by hand the values measured on site.
On the meter
- Illuminated graphic LCD display and USB interface.
- Real-time clock (RTC) that dates every measurement.
- Battery energy indicator while data is transferred.
Earth resistance: 3 or 4-pole method, and with clamps (multiple earths)
Measuring range according to IEC 61557-5: 0.30 Ω...19.9 kΩ
| Range | Resolution | Accuracy |
|---|---|---|
| 0.00…3.999 Ω | 0.001 Ω | ±2% m.v. +4 digits |
| 4.0…39.99 Ω | 0.01 Ω | ±2% m.v. +2 digits |
| 40.0…399.9 Ω | 0.1 Ω | |
| 400…3999 Ω | 1 Ω | |
| 4.0…19.99 kΩ | 10 Ω | ±5% m.v. +2 digits |
With clamps: multiple earths (3 wires + clamps) — Measuring range according to IEC 61557-5: 0.12 Ω...1999 Ω
| Range | Resolution | Accuracy |
|---|---|---|
| 0.00…3.99 Ω | 0.001 Ω | ±8% m.v. +4 digits |
| 4.0…39.99 Ω | 0.01 Ω | ±8% m.v. +3 digits |
| 40…399.9 Ω | 0.1 Ω | |
| 400…1999 Ω | 1 Ω |
Double-clamp method
| Range | Resolution | Accuracy |
|---|---|---|
| 0.00…19.99 Ω | 0.01 Ω | ±10% m.v. +3 digits |
| 20.0…149.9 Ω | 0.1 Ω | ±20% m.v. +3 digits |
Pulse method: dynamic earth resistance (4-pole)
| Range | Resolution | Accuracy |
|---|---|---|
| 0.00…99.9 Ω | 0.1 Ω | ±2.5% m.v. +3 digits |
| 100…200 Ω | 1 Ω |
Available pulse slopes: 4/10 μs, 8/20 μs and 10/350 μs.
| 27003, Lugo, Spain C/ María Barbeito, 14 | Contact Contact T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | info@amperis.com | www.amperis.com |
Soil resistivity
Wenner method: ρ = 2πLRE
| Range | Resolution | Accuracy |
|---|---|---|
| 0.00…199.9 Ω·m | 0.1 Ω·m | Depends on the base error of the RE measurement in the 4-wire system, but not less than ±1 digit |
| 200…1999 Ω·m | 1 Ω·m | |
| 2.00 k…19.99 kΩ·m | 10 Ω·m | |
| 20.0 k…99.9 kΩ·m | 100 Ω·m | |
| 100…999 kΩ·m | 1 kΩ·m |
Alternating current measurement (with clamps)
| 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 | 0.001 A | ±5% m.v. +5 digits |
| 5.0…9.99 A | 0.01 A | ±5% m.v. +5 digits |
| 10…99.9 A | 0.1 A | |
| 100…300 A | 1 A |
With C-3 receiving clamps (Ø 52 mm) or F-1 flexible clamps (Ø 400 mm), depending on the range.
| 27003, Lugo, Spain C/ María Barbeito, 14 | Contact Contact T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | info@amperis.com | www.amperis.com |
Resistance of the auxiliary electrodes RH and RS
| Range | Resolution | Accuracy |
|---|---|---|
| 0.00…999 Ω | 1 Ω | ±5% (RS+RE+RH) +8 digits |
| 1.0 k…9.99 kΩ | 10 Ω | |
| 10.0 k…19.9 kΩ | 100 Ω |
Continuity of compensating and protective connections — Measuring range according to IEC 61557-5: 0.24 Ω...19.9 kΩ
| Range | Resolution | Accuracy |
|---|---|---|
| 0.00…3.99 Ω | 0.001 Ω | ±2% m.v. +4 digits |
| 4.0…39.9 Ω | 0.01 Ω | ±2% m.v. +2 digits |
| 40…399 Ω | 0.1 Ω | |
| 400…3999 Ω | 1 Ω | |
| 4.0…19.9 kΩ | 10 Ω | ±5% m.v. +2 digits |
The RH and RS values are read on the right-hand side of the display, separate from the main result.
General specifications, power supply and standards
| Type of insulation | Double, according to EN 61010-1 and IEC 61557 |
|---|---|
| Measurement category | CAT III 600 V according to EN 61010-1 |
| Protection class | IP54 according to EN 60529 |
| Display | Illuminated graphic LCD |
| Interface | USB |
| Memory | 990 measurements (10 banks of 99 cells) |
| Battery set life | More than 300 measurements |
| Warranty | 36 months |
| Operating temperature | -10…+50 °C |
| Storage temperature | -20…+70 °C |
| Humidity | 20…80% |
Disturbance voltage and frequency
| Quantity | Range | Resolution | Accuracy |
|---|---|---|---|
| Disturbance voltage (r.m.s.) | 0…100 V | 1 V | ±2% m.v. +3 digits |
| Disturbance frequency | 15…450 Hz | 1 Hz | ±1% m.v. +2 digits |
Standard accessories: 50 m, 25 m and 25 m earth cables on a reel; 1.2 m and 2.2 m cables with banana plug; USB cable; 12 V car charger; four 30 cm earth probes; L2 case; K01 and K02 crocodile clips; Ni-MH 4.8 V 4.2 Ah battery set; power supply cable and charger; carrying harness; calibration certificate and user's manual.
Optional accessories: software for creating documentation; 80 cm probe; N-1 emission and C-3 receiving clamps (Ø 52 mm); 2 m two-wire cable; LR14 battery case; L3 cover for the 80 cm probe; F-1 spring (Rogowski coil) clamps.
"m.v." = measured value.