Earth Tester

Earth Tester (3)

Wednesday, 12 August 2015 07:18 Written by

MTD20KWe

The MTD-20KWe digital earth tester allows for the measurement of Earth Resistances and Soil Specific Resistivity, and also the spurious voltages caused by parasitic voltages present in the soil.

This equipment is suitable for fast and easy measurement of the grounding resistance in house and industrial buildings, hospital installations, lightning rods, antennas, substations, etc. Soil resistivity measurement allows for soil stratification in order to optimize the most complex grounding systems engineering.

Its state-of-the-art system of active and passive filters provides it with high immunity to electric interferences, making it possible to obtain reliable measurements even in the presence of spurious voltages, such as the ones that can be found in some urban areas and near primary substations.

A 1,470 Hz internal generator injects alternated current on the soil through an auxiliary rod. The voltage generated over the earth resistance is measured by the apparatus, and the resistance value is evaluated. The test current is automatically regulated.

Features

  • 3½ digits display
  • Earth Resistance measurement
  • Spurious voltage measurement
  • Resolution: 0.01 Ω
  • Resistance reading: up to 20 kΩ
  • Audible signal indicates anomalies in the current circuit

Specifications

Specifications   
Measurement ranges

Resistance: 0-20 Ω; 0-200 Ω; 0-2,000 Ω; 0-20 kΩ

Tension: 0-200 V~.

Accuracy

Resistance measurements:

± (2% of the measured value + 1% of the maximum value of the selected range).

Voltage measurements:

± (2% of the measured value + 1% of end of scale value).

Reading resolution

0.01 Ω in the resistance measurement. 

0.1 V in the voltage measurement.

Output power and current The output power is less than 0.5 W, and the output current is limited to less than 15 mA (Peak to peak).
Audible alarm It warns the operator in case that there are abnormalities in the current circuit, which make it difficult to obtain a reliable result.
Battery charger A smart, microprocessor controlled, circuit adjusts the battery charge to the optimised parameters in order to ensure the maximum service life. It is supplied by means of an external AC adapter (provided with the equipment) or from a 12 V car battery.
Tuesday, 28 July 2020 12:32 Written by

EM 4058

The EM-4058 earth tester is a digital, microprocessor controlled instrument that allows to measure the earth resistance and ground resistivity (using Wenner´s method), as well as to detect parasitic voltages present in the ground. This instrument is suitable to measure earth systems in power substations, industries, distribution networks, etc., according to IEC 61557-5.

In order to conveniently test the earth system, EM4058 allows to perform measurements using the test current which frequency may be operator-selected (270 Hz, 570 Hz, 870 Hz, 1170 Hz or 1470 Hz). On one hand, the lowest frequency will allow to analyze the earth system behavior related to fault currents of industrial frequency, while on the other hand, the measurement performed with the highest frequency will best show the behavior in connection with electrical currents caused by lightning and will offer a very high immunity related to interference voltages that are usually present in soils, specially near substations.

The instrument has four ranges that are automatically selected, covering measurements from 0.01 Ω up to 20 kΩ, which allows to obtain very accurate measurements for any kind of soils. During ground resistivity measurement, the operator may indicate the distance between spikes in order for the equipment to apply Wenner's formula and to show the resistivity value directly.

Features

  • Earth resistance measurement
  • Ground resistivity (Wenner's method)
  • High spurious voltage rejection
  • Spurious voltage measurement
  • Measure with multiples frequencies (270 Hz, 570 Hz, 870 Hz, 1170 Hz, 1470 Hz)
  • 0.01 Ω resolution
  • Up to 20 kΩ resistance range
  • Remote control through an Android App
  • Auto-range
  • Built-in memory
  • Built-in printer
  • USB interface

Specifications

Specifications   
Measurement ranges

Resistances: 0-20 Ω; 0-200 Ω; 0-2,000 Ω; 0-20 kΩ (Auto-ranging)

Resistivity :  0- 50 kΩm (auto ranging)

Voltage: 0-60 V~

Accuracy

Resistance & Resistivity measurements:

R ≤ 2 kΩ: ± (2% of the measured value ± 2 digits).
R > 2 kΩ: ± (5% of the measured value ± 2 digits).

Voltage measurements:

± (2% of the measured value + 1% of end of scale value).

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 mARMS (according the IEC 61557-5 - 4.5).
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).

Battery charger A smart, microprocessor controlled, circuit adjusts the battery charge to the optimised parameters in order to ensure the maximum service life. It is supplied by means of an external AC adapter (provided with the equipment) or from a 12 V car battery.
Tuesday, 28 July 2020 13:05 Written by

TM25r

The TM25R grounding resistance meter for high frequency has been developed  to ensure Testing of the power transmission towers grounding (G) without interruption of the power. This is the appropriate tool for a fast, safe and reliable grounding resistance measurement in each tower of a working line transmission, without disconnecting the ground wire.

The TM25R has a Bluetooth interface that allows remote control of it through a tablet with BlueLogg software. With it you can save the photos of the towers and the GPS coordinates of each. It also allows you to record voice comments for each measurement. This equipment is powered with its universal charger, from a built-in rechargeable battery. It is a strong equipment, easy to carry, resistant to the hard weather and geographical features of the tropical and high-mountain regions, that is why it is described as an excellent product for field works under the most severe environmental conditions.

 

Features

  • Intended for measurement of earth resistance of electricity pylons
  • Minimizes the influence of adjacent pylons, connected by the guard cable
  • Operation frequency: 25 kHz
  • Resistance reading: up to 300 Ω
  • Automatic current injection
  • Built-in memory and printer
  • Rechargeable battery

Specifications

Specifications    TM25r
Measurement ranges

0 - 300 Ω

Accuracy

± 2.5 % of reading ± 1 digit

Operating Frequency 

25KHz

Test Current 20mA automatic
Interface 

USB & Bluetooth 

Battery charger Internal or external rechargeable battery, 12 V. Internal battery autonomy: at least 2 hours.
Environment 

 -5 °C to 50 °C. (Operating)

-15 °C to 65 °C (Storage) 

Up to 95% RH (non condensing)

Weight 

4.9 Kg (Approx)

Dimension

340 x 295 x 152 mm