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Summary of Contents for MEGABRAS MTD20KWR
- Page 1 MTD20KWR Digital earth tester User manual Parts of this manual may differ from your equipment depending on your country, hardware and/or firmware version, and are subject to change without notice. © 2023 MEGABRAS. All rights reserved. 2023-03-24...
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Page 2: Table Of Contents
Content Safety information ......................3 Symbols ........................... 4 Bluetooth ......................... 5 1. Description ........................6 2. Control panel ........................ 7 2.1. Keyboard ......................8 3. Power supply ........................ 8 3.1. Battery status ....................... 8 3.2. Battery charger ..................... 9 4. Performing measurements ...................10 4.1. -
Page 3: Safety Information
MTD20KWR Safety information z Before to use this instrument the User manual and Safety information must be read and understood z Safety procedures must be observed during the use of this equipment z The panel, terminals and connectors of the equipment must stay dry and clean z Only use accessories supplied by the manufacturer. -
Page 4: Symbols
Symbols Caution, risk of electric shock. Caution, refer to User manual. Connector polarity indication. CAT II Measuring category II. 300 V: Maximum voltage permitted between the terminals. 300 V Ground. Double insulation (Class II). On/Off. Voltmeter. Bluetooth. Equipment complies with current EU Directives. 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 5: Bluetooth
MTD20KWR Bluetooth This equipment has Bluetooth® interface and can be controlled remotely via a smartphone / tablet with Android™ running the BlueLogg application. • Android, Google Play and the Google Play logo are trademarks of Google LLC • Bluetooth® is a registered trademark of the... -
Page 6: Description
1. Description The MTD20KWR digital earth tester allows the measurement of earth resistance and soil 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. -
Page 7: Control Panel
MTD20KWR 2. Control panel Output terminal H On/Off switch Output terminal S Power supply input Output terminal ES Graphic display Output terminal E Keyboard... -
Page 8: Keyboard
2.1. Keyboard Button Function On/Off key: • Short press (1 second): Power On / Off the equipment • Long press (10 seconds): Hard shutdown Selects the resistance measurement mode Selects the resistivity measurement mode Selects the voltmeter function Starts the test 3. -
Page 9: Battery Charger
MTD20KWR 3.2. Battery charger This equipment has an intelligent built-in circuit that controls the battery charge. In order to charge the battery, follow this procedure: z Make sure the equipment is switched off z Connect the equipment into the mains supply (using the supplied AC Adapter) z The battery charge indicator will appear on the display z When the battery is charged, the display will indicate “FULL”... -
Page 10: Performing Measurements
4. Performing measurements 4.1. Grounding resistance measurement Insert in the soil two auxiliary rods: the E3 current rod and the E2 voltage rod. Connect them by means of provided cables to H and S output terminals, respectively. The E terminal must be connected to the grounding system under test (E1) using the 5 meters cable (see fig. -
Page 11: Spurious Voltages Measurement
MTD20KWR Press the key. A “wait“ message will be displayed. After a few seconds, the result will be displayed. 4.2. Spurious voltages measurement In order to check the existence and measure the spurious voltages present in the soil, the inserted rods must be kept in place, connected to the equipment as shown in figure 1. -
Page 12: Soil Resistivity Measurement
4.3. Soil resistivity measurement Insert four rods (spikes) in the soil, well aligned and with a constant “a“ separation, as shown in fig. 2. When performing this measurement, the distance between the rods is critical as it takes part in the resistivity calculation. Select the ρ... - Page 13 MTD20KWR Press the key. A “wait“ message will be displayed. After a few seconds, the result will be displayed. To obtain the soil resistivity value, Wenner’s equation should be applied. In its simplified form, this equation is as follows: ρ = 2πRa Where: ρ...
- Page 14 distances which are generally adopted are: 1 m, 2 m, 4 m, 8 m, 16 m. In order to carry out measurements with “a“ = 16 m, cables can be distributed as shown in figure 3, with the instrument near the ES rod. Wenner’s equation simplified form can be applied whenever the insertion depth of each rod is not significant compared to the “a“...
- Page 15 MTD20KWR In order to properly evaluate soil resistivity, measurements must cover the whole area to be occupied and influenced by the future grounding system. For an area of up to 10,000 m , it is recommended resistance measurements to be performed in at least five points, arranged as shown in figure 4.
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Page 16: Abnormalities Indications On The Display
5. Abnormalities indications on the display If the MTD20KWR 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 17: Excessively High Earth Resistance
MTD20KWR 5.2. 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: 5.3. 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... -
Page 18: Influence Of Grounding Resistance Of The Auxiliary Rods
6. Influence of grounding resistance of the auxiliary rods The current rod may have a resistance of up to 5,000 Ω, without affecting measurements and without causing significant errors. 7. Special considerations about grounding resistance measurements By employing the Fall of Potential method, normally used to measure Grounding Diffusion System (GDS) resistance, two rods are used as auxiliary electrodes. - Page 19 MTD20KWR 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. A distance of 62% is usually adopted as a first try (62% rule).
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Page 20: Equipment Operation Checking
8. Equipment operation checking Using a standard resistance (i.e. 10.0 Ω nominal), it’s possible to test the equipment calibration. This resistance must be connected to the 4 terminals on the earth meter, as shown in fig. 6. Following this procedure: z Press the z Check the battery charge status. -
Page 21: Technical Specifications
MTD20KWR 10. Technical specifications Application Measurement of grounding resistances (3 terminals), soil resistivity (4 terminals) and spurious voltages present in the soil. Resistance measurement The equipment injects an electronically stabilized current method in the soil, and measures, with high precision, the voltage developed in the soil by means of that current flowing through grounding diffusion resistances. - Page 22 Display Graphic display (128 x 64 px) Safety Complies with the requirements of IEC 61010-1, IEC 61557-1 and IEC 61557-5 Overvoltage category CAT II - 300 V Compliance with IEC 61326-1 Environmental protection IP65 (closed lid) Power supply By means of an internal rechargeable NiMH battery or from a 12 V external battery.
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Page 23: Warranty
MTD20KWR 11. 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 website www.megabras.com. This warranty does not apply to accessories or damage caused where repairs have been made or attempted by others. - Page 24 MEGABRAS INDÚSTRIA ELETRÔNICA LTDA. Rua Gibraltar, 172 - Santo Amaro CEP 04755-070 - São Paulo - SP - Brazil Phone: +55 (11) 3254-8111 / +55 (11) 5641-8111 - Fax: +55 (11) 5641-9755 www.megabras.com...
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