APPLICATION
Earth resistance measuring of simple or complex electrode systems, Ground resistivity measurements (Four terminal Wenner´s principle), and Spurious voltage according to IEC 61557-5

RESISTANCE MEASUREMENT METHOD
The equipment injects an electronically generated current in the soil, and measures, with high precision, both that current and  the voltage developed in the soil by means of that current flowing through grounding diffusion resistance. The display shows the Resistance value.

OPERATION FREQUENCY
During R measurement operators should select the following test frequencies: 270 Hz ± 1 Hz or 1470 Hz ± 1 Hz

VOLTMETER
In the voltmeter function, the equipment operates as a CA conventional voltmeter, making it possible to measure voltages generated by parasitic currents.

MEASUREMENT RANGES
Resistance: 0 - 20kΩ  (autoranging)
Resistivity: 0 - 50kΩm  (autoranging)
Voltage: 0 - 60V~

ACCURACY
Resistance and Resistivity measurements: ± (2% of the measured value ± 2 digits)
Voltage measurement: ± (3% of the measured value ± 2 digits)

READING RESOLUTION
0.01Ω  in the resistance measurement.
0.01Ωm in the resistivity measurement.
0.1V in the voltage measurement.

OUTPUT CURRENT
The short-circuit current is limited to less than 3.5mA r.m.s. (according the IEC 61557-5  - 4.5 )

IMMUNITY TO SPURIOUS VOLTAGE INTERFERENCE
During the R measurement, it allows for the presence of spurious voltage up to 7V~.

EARTH RESISTANCE OF  AUXILIARY RODS
In the R measurement it allows Raux up to 50kΩ  with error < 30%

BATTERY STATUS CHECKING
The battery charge status is verified under normal using conditions.

ADVANCED FEATURES
Automated detection of abnormal conditions that may cause excessive errors (low battery, too high noise interference, too high test spikes resistance)

SOIL RESISTIVITY COMPUTING
When performing soil resistivity measurements, the operator informs to the EM-4055 the distance between spikes and the equipment automatically computes soil resistivity using the Wenner full equation.

SERIAL DATA OUTPUT
RS-232 @ 4800 bps. Suitable for data collection in an external serial printer, computer or data-logger.

BUILT-IN PRINTER (OPTIONAL)
For a printed register document of measured values.

POWER SUPPLY
By means of an internal rechargeable battery, 12V   2.3Ah.

BATTERY CHARGER
A smart, microprocessor-controlled, circuit that adjusts the battery charge to the optimised parameters in order to ensure highest service life. For 100-240 V mains supply.

SAFETY CLASS
It meets the requirements of IEC 61010-1/1990, IEC 61010, 1/1992 amendment 2

E.M.C
In accordance with IEC 61326-1

ELECTROSTATIC IMMUNITY
In accordance with IEC 1000-4-2

ELECTRO MAGNETIC IRRADIATION IMMUNITY
In accordance with IEC 61000-4-3

ENVIRONMENTAL PROTECTION
IP54 with closed lid.

OPERATION TEMPERATURE
-10°C to 50°C

STORAGE TEMPERATURE
-25°C to 65°C

HUMIDITY
95% RH (without condensation)

EQUIPMENT WEIGHT
Approximately 3.6kg (without printer)

SIZE
274 X 250 X 124 mm

INCLUDED ACCESSORIES
Four steel rods.
One charger power cord.
One 40 meters cable in red colour.
Two 20 meters cable in blue and green colour.
One 5 meters cable in black colour.
One 5 meters cable to connect to the grounding system to be measured.  
One canvas bag.