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MEGABRAS EM4050 User Manual

Digital earth tester
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Summary of Contents for MEGABRAS EM4050

  • Page 2 EM4050 Digital earth tester User guide GU-1585 © 2020 MEGABRAS. All rights reserved.

  • Page 3: Used Symbols

    Used symbols Caution, refer to User Guide. USB (Universal Serial Bus). Equipment complies with current EU Directives. Backlight. Double insulation. Voltmeter. Battery. Printer. Printer paper feed. Ground. The rubbish bin with a line through it means that in the European Union, the product must undergo selective disposal for the recycling of electric and electronic material, in compliance with Directive WEEE 2002/96/EC.

  • Page 4: Table Of Contents

    Index 1. Description......................6 2. Control panel......................7 2.1. Connections and items...................7 2.2. Keyboard......................8 3. Measurement ranges.....................9 4. Battery / battery charger..................9 4.1. Battery status....................9 4.2. Battery charger.....................10 5. Equipment calibration checking................11 6. Grounding resistance measurement..............12 6.1. Observations about grounding diffusion systems (GDS)......13 7.

  • Page 5: Description

    Wenner's formula and to show the resistivity value directly. The EM4050 has a built-in memory to store measurements and a built-in printer, besides the USB interface that allows to communicate measured values to a computer or data logger for their later analysis. It is a portable, strong and lightweight equipment, suitable to be used out in the field and under severe weather conditions.

  • Page 6: Control Panel

    2. Control panel All of the EM4050 buttons, keys, outputs and connections are located on the panel, and are easily accessible by the operator. The following graphics show the function of each one of the equipment’s items. 2.1. Connections and items ...

  • Page 7: Keyboard

    2.2. Keyboard Function ON/OFF switch Resistance measurement Selects the resistance measurement function function is selected Selects the resistivity measurement function Resistivity measurement function is selected Increase or decrease the specified distance between rods in a progression of 1, 2, 4, 8, 16, 32 meters or Rx (used to check the equipment calibration) Increase or decrease the specified distance between rods in one meter steps.

  • Page 8: Measurement Ranges

    4. Battery / battery charger The EM4050 uses a rechargeable LFP battery (LiFePO4 12 V – 3000 mAh). At the end of its useful life, the battery must be recycled or disposed of properly, in order to protect the environment.

  • Page 9: Battery Charger

    4.2. Battery charger This equipment has an intelligent built-in circuit that controls the battery charge. In order to charge the battery, follow this procedure: • Verify that the On/Off switch is switched off • Connect the equipment into the mains supply (using the supplied AC Adapter).

  • Page 10: Equipment Calibration Checking

    5. Equipment calibration checking By using a standard resistance (Rx), it is possible to test the equipment calibration. The resistance must be connected to the EM4050 as shown below: After connecting the resistance, follow these procedures: Turn the EM4050 on ( ...

  • Page 11: Grounding Resistance Measurement

    6. Grounding resistance measurement When turning on the EM4050, the display will show the opening message, followed by the parameters Earth Resistance / 3-Pole. This is the standard function. Insert the auxiliary rods (current rod E3 and voltage rod E2) in the ground.

  • Page 12: Observations About Grounding Diffusion Systems (Gds)

    Press the key to start the test. The test number will be shown on the display, followed by the message “WAIT...”, and after a few moments the resistance value will appear, as in the following example: R= 5.11Ω 3-Pole 2015-01-01 17:21 The result will then be stored on the memory.
  • Page 13 Potential plateau Ground diffusion resistance Current Rod E3 Voltage Rod E2 Ground diffusion measurements resistance influence points area Current Rod E3 influence area fig. 2 Generally, GDS dimensions are greater than those of the auxiliary current rod, thus its area of influence diameter is also greater. So, in order to comply with the required condition, the probe must be set up closer to the current rod than to the GDS.

  • Page 14: Spurious Voltages Measurement

    7. Spurious voltages measurement In order to check the existence and measure eventual parasitic currents in the soil, the rods must be set up in the same position used to perform grounding diffusion measurements. After placing the rods, press the key.

  • Page 15: Soil Resistivity Measurement

    8. Soil resistivity measurement To select the resistivity measurement function press the key. Insert four rods in the ground, well aligned and with an equal distance from each other. Connect them to the output terminals using the supplied cables. Remember that the distance between rods is very important when measuring soil resistivity, since this value is part of the calculation.
  • Page 16 = soil resistivity value; will be shown on the display a= distance (in meters) between rods; specified by the operator p= insertion depth (in meters) of the rods – the EM4050 uses 0.25 m R= resistance value used by the equipment to calculate ρ...
  • Page 17 Larger areas can be divided in areas of 10,000 m² each. In the case of different forms, limiting the area in smaller rectangles is a possible and practical solution. Measurements points: A B C D E Direction of measurements fig. 5...

  • Page 18: Abnormalities Indications

    9.2. Display indications If the EM4050 identifies any abnormality causing the measurements to be excessively inaccurate or not possible at all, a warning message will be shown on the display, allowing the operator to identify and correct the problem.

  • Page 19: Excessively High Earth Resistance

    9.4. Excessively high earth resistance If the system’s resistance is exceptionally high (above 20.00 kΩ), and therefore beyond the equipment range, the following message will appear: R > 20kΩ 3-Pole 2015-01-01 17:21 9.5. Excessively high resistance in the auxiliary rods If, by any reason, there is no current between H and E, or if resistance on the H pole is too high, the display will show: Check H-pole...

  • Page 20: Excessively High Soil Resistivity

    9.6. Excessively high soil resistivity If soil resistivity is excessively high (above 50 kΩm), and therefore beyond the equipment range, the following message will appear: ρ > 50k m Ω 4-Pole a= 2m 2015-01-01 17:21...

  • Page 21: Backlight

    After 10 seconds the backlight will auto-turn off. If you want to reactivate it, press key again. 11. Auto power-off The EM4050 auto-turns off after 3 minutes of inactivity. 12. Internal memory This device has an internal memory of up to 4,000 measured values. 13. Software 13.1.

  • Page 22: Megalogg2 Software

    13.2. MegaLogg2 software This software makes communication between the equipment and a computer with Windows OS easier. It makes possible to synchronize the date and time of the equipment with the computer date and time, to transfer the stored date, clear the memory, etc. 14.

  • Page 23: Replacing The Paper Roll - Quick Replacement Procedure

    15.1. Replacing the paper roll – quick replacement procedure The following procedure demonstrates how to quickly replace the paper roll (No tool required). Precautions • Perform the following procedure with the equipment POWERED ON (battery supplied). • To eliminate electrical hazards, disconnect the equipment from the main supply, remove the AC Adapter and disconnect the test leads.
  • Page 24 Fold or Cut the paper tip as Insert the paper tip in the aperture Press and hold the Paper Feed illustrated. located between the paper container button until the paper tip appears at and the printer mechanism cover. A the paper output opening and place sensor will detect the paper and the the paper roll in the paper container.

  • Page 25: Replacing The Paper Roll - Complete Replacement Procedure

    15.2. Replacing paper roll – complete replacement procedure The following procedure demonstrates how to replace the paper roll by removing the printer mechanism cover (Requires a Phillips screwdriver). Precautions • Perform the following procedure with the equipment POWERED OFF. • To eliminate electrical hazards, disconnect the equipment from the main supply, remove the AC Adapter and disconnect the test leads.
  • Page 26 Reposition the printer cylinder. The Reinsert printer mechanism cover. Push the sides of the printer paper tip must be placed between mechanism cover as indicated. Make the printer mechanism header and sure that the cover is aligned and the cylinder. locked in its intended position.

  • Page 27: Technical Specifications

    : When performing soil resistivity measurements, the Soil resistivity computing operator informs to the EM4050 the distance between spikes and the equipment automatically computes soil resistivity using the Wenner full equation. Interface : USB.
  • Page 28 Auto power-off : Auto-turns off after 3 minutes of inactivity. Power supply : Internal rechargeable LFP battery (LiFePO4 12 V - 3000 mAh). Battery status checking : It makes it possible to verify the battery charge status under normal use conditions. Battery charger : A smart, microprocessor controlled, circuit adjusts the battery charge to the optimized parameters in order to...
  • Page 29 Included accessories : • 4 steel rods (spikes), 400 mm long, easy removal • Blue test lead, 50 meters cable (on reel) • Red test lead, 30 meters cable (on reel) • Green test lead, 15 meters cable (on reel) •...

  • Page 30: Warranty

    17. Warranty MEGABRAS warrants the products for two years from date of shipment. We will repair, without charge, any defects due to faulty materials or workmanship. For warranty repair information, visit our web-page www.megabras.com. This warranty does not apply to accessories or damage caused where repairs have been made or attempted by others.
  • Page 31 Notes...
  • Page 32 Notes...
  • Page 33 Notes...

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