Earth Tester

Earth Tester (3)

Saturday, 08 August 2015 15:17 Written by

TM25r

The transmission towers are electrically grounded by ground wires and due to the existence of this connection, any attempt to measure a tower ground resistance by any conventional earth tester leads to wrong results. To make this kind of test feasible, TM- 25R is the appropriate tool for a fast, safe and reliable grounding resistance measurement in each tower at charged transmission lines, without disconnecting the ground wire. The equipment only measures the ground resistance of the Surveyed Tower, including its base.

Features

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

Specifications

Parameters TM25R
Measurement Range 0 to 300 Ω
Test Current 20 mA automatic
Display Alphanumeric display (LCD)
Max. Earth Resistance Of Auxiliary Rods 2,000 Ω (current rod) , 2,000 Ω (voltage rod)
Power Supply Internal rechargeable battery
Operating Temperature -5°C to 50°C
Humidity Up to 95% RH (non condensing)
Equipment Weight 4.9 kg
Measurement Accuracy ± 2.5 % of reading ± 1 digit
Data Output USB
Built-In Memory It allows for the storage of 2,000 test readings in its internal NVRAM memory
Battery Charger 12 V - 2 A
Storage Temperature -15°C to 65°C
Dimensions 340 x 295 x 152 mm
Accessories Weight Approx. 16.5 kg

 

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 Resistence measurement
  • Spurious voltage measurement
  • Resolution: 0.01 Ω
  • Resistence reading: up to 20 kΩ
  • Audible signal indicates anomalies in the current circuit

Specifications

Specifications   
Measurement ranges

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

Tension: 0-200 V~.

Accuracy

Resistances 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.
Saturday, 08 August 2015 15:24 Written by

EM 4055

The MTD-20KWe & EM 4055 digital earth testeres allows for the measurement of Earth Resistances and Soil Specific Resistivity, and also the spurious voltages caused by parasitic voltages present in the soil. An internal current 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

  • Earth resistance measurement
  • Ground resistivity (Wenner´s method)
  • High spurious voltage rejection
  • Spurios voltage measurement
  • 0.01 Ω resolution
  • Up to 20 kΩ resistance range
  • Auto-range
  • Built-in memory
  • Built-in printer (optional)
  • USB interface

Specifications

Parameters MTD 20KWe EM 4055
Measurement ranges Resistance - 0 – 20 Ω, 0 - 200 Ω, 0 - 2000 Ω, 0 – 20 KΩ, Voltage – 0 – 200 AC Resistance (Autoranging) - 0 – 20 KΩ, Resistivity 0 – 50 KΩm Voltage – 0 – 60 AC
Measurement Accuracy Resistance ± 2% of Reading ± 1 % of range Voltage ± 2% of Reading ±1 % of range Resistance ± 2% of Reading ± 2 Digit Voltage ± 3% of Reading ± 2 Digit
Measurement Resolution Resistance - 0.01 Ω, Voltage – 0.1 V Resistance - 0.01 Ω, Resistivity 0.01Ωm Voltage – 0.1 V
Operating temperature -10˚C to 50˚C -10˚C to 50˚C
Equipment Weight Approximately 2.3 Kg (without accessories) Approximately 3.6 Kg (without printer)
Dimensions 221 x 189 x 99 mm 274 x 250 x 124 mm