• Earth resistance measurement
• Ground resistivity (Wenner's method)
• High spurious voltage rejection
• Spurious voltage measurement
• 0.01 Ω resolution
• Up to 20 kΩ resistance range
• Measure with multiples frequencies
(270 Hz, 570 Hz, 870 Hz, 1170 Hz, 1470 Hz)
• Built-in memory
• USB interface
Operation frequency
270 Hz (resistance or resistivity measurement)
570 Hz, 870 Hz, 1170 Hz or 1470 Hz (resistance measurement)
Max. variation: ± 1 Hz (both cases).
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: 0-20 Ω; 0-200 Ω; 0-2000 Ω y 0-20 kΩ (auto ranging)
Resistivity: 0 - 50 kΩm (autoranging).
Voltage: 0 - 60 V~.
Accuracy
Resistance and Resistivity measurements:
R ≤ 2 kΩ:± (2% of the measured value ± 2 digits).
R > 2 kΩ:± (5% of the measured value ± 2 digits).
Voltage measurement: ± (3% of the measured value ± 2 digits).
Reading resolution
0.01 Ω in the resistance measurement.
0.01 Ωm in the resistivity measurement.
0.1 V in the voltage measurement.
Output current
The short-circuit current is limited to less than 20.0 mA R.M.S. (according the IEC 61557-5 - 4.5).
Imunity to spurious voltage interference
During the R measurement, it allows for the presence of spurious voltage up to 7 V~, with a error < 10%.
Earth resistance of auxiliary rods
In the R measurement it allows Raux up to 50 kΩ 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 EM4058 the distance between spikes and the equipment automatically computes soil resistivity using the Wenner full equation.
Interface
USB.