Megger DET3TA User Manual
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Megger DET3TA User Manual

Megger DET3TA User Manual

Earth ground electrode testers
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DET3TA, DET3TC, DET3TD and DET4TD
Earth Ground Electrode Testers
USER MANUAL

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Summary of Contents for Megger DET3TA

  • Page 1 DET3TA, DET3TC, DET3TD and DET4TD Earth Ground Electrode Testers USER MANUAL...

  • Page 2: Safety Notices

    SAFETY WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use. Do not leave the instrument connected to the system under test when not in use. Circuit connections and exposed metalwork of an installation or equipment under test must not be touched. The instrument must not be operated or connected to any external system if it shows any visible signs of damage or if it has been stored for prolonged periods in unfavourable conditions.
  • Page 3 LIVE EARTH SAFETY PRECAUTIONS It is preferable that the earth electrode to be tested is first isolated from the circuit it is protecting, so that only the earth is measured and not the complete system. When this is done, the circuits and equipment must be de-energised. If however this is not possible, the earth electrode should be duplicated so that when it is disconnected for test purposes, the other one provides the necessary circuit protection.

  • Page 4: Table Of Contents

    Measuring ground resistance with the ICLAMP (DET3TC) Attached Rod Technique (ART) (DET3TC) Measuring ground resistance with the ICLAMP using the ART (DET3TC) Description of Tests for Model DET3TA Battery-life reading Ground noise voltage measurement Two-terminal resistance measurement Three-terminal resistance measurement...

  • Page 5: Introduction

    GENERAL DESCRIPTION Thank you for purchasing the Megger Earth Ground Electrode Tester. The Megger DET family of test instruments offers a unique solution to the measurement of earth or ground electrode (rod) resistance and soil For your own safety and to get the maximum benefit from your resistivity.

  • Page 6: Instrument Illustrations

    INSTRUMENT ILLUSTRATIONS DET3TA Test lead connections Feature DET3TA DET3TC DET3TD DET4TD (at rear) Multi-function Current measurement analogue display Rc OK LCD display Moving coil meter Resistance P Spike button measurement IP54 rated settings (2P and EN61010-1 100 V CATIV Selector switch Each instrument kit comprises instrument, test leads, test spikes, batteries and calibration certificate stored in a tough polypropylene carrying-case.
  • Page 7 DET3TC DET3TD Test lead connections Test lead connections (at rear) (at rear) Digital LCD display Digital LCD display Resistance Resistance measurement settings measurement settings Test button Test button (2P and 3P) (2P, 3P and clamp) Selector switch Selector switch Voltage measurement Voltage and current settings Warning - refer to...

  • Page 8: Preparations For Use (All Instruments)

    PREPARATIONS FOR USE (ALL INSTRUMENTS) DET4D Batteries Test lead connections (at rear of instrument) The Megger DET series instruments are supplied with batteries fitted. Digital LCD display When batteries become exhausted, refer to the section on battery replacement. Resistance measurement...

  • Page 9: General Operating Instructions (All Instruments)

    Rc and Rp limit reduced to 50 kΩ for 25 V output. Warning Triangle Rc and Rp limit reduced to 5 kΩ on 18 Ω range to achieve 0.01 Ω Fuse Blown resolution. Battery Indicator (not DET3TA). >100V Indicates that the ground noise voltage exceeds the instrument measurement capability. Rp OK Potential spike (P Spike) is within range for accurate measurement (<100 kΩ).

  • Page 10: Replacing Batteries And Fuses

    (DET3TC, DET3TD and DET4TD) or by switching to the battery Warning: Do not operate instrument with the battery cover removed. setting and pressing the TEST button (DET3TA). Figure 1 shows the progression of the battery indicator (for the DET3TC, 1.

  • Page 11: Megger's 'Down To Earth' Publication

    MEGGER’S ‘DOWN TO EARTH’ PUBLICATION The following descriptions of tests are a set of instructions for the sole (DET3TD, DET3TC and DET4TD) Blown fuse symbol: purpose of the proper use of these instruments by competent persons. Where there is doubt about a particular application, reference should be Only one fuse is contained within the instrument, and is user-replaceable.

  • Page 12: Two-Terminal Resistance Measurement

    To measure the ground noise voltage: 4. A resistance reading will be displayed on the LCD display as shown in Figure 4. 1. With the selector switch set to the ‘OFF’position, connect the instrument as shown in Figure 2. 2. Set the selector switch to the ground noise voltage setting marked ‘V’. 3.

  • Page 13: Four-Terminal Ground Rod Resistance Measurement (Det4Td)

    1. With the selector switch in the ’OFF’ position, connect the instrument 1. With the selector switch in the ‘OFF’ position, connect the instrument as shown in Figure 5. as shown in Figure 5, with the lead shown dotted connecting terminal ‘C1’...

  • Page 14: Calibrating The Instrument To The Iclamp (Det3Tc)

    1. With the selector switch in the ‘OFF’ position, connect the instrument as 8. The instrument is now calibrated to the particular ICLAMP . shown in Figure 7. 9. Switch the instrument to the OFF position. 2. Set the selector switch to the 4 point resistance measurement setting marked ‘4P’.

  • Page 15: Attached Rod Technique (Art) (Det3Tc)

    Attached Rod Technique (ART) (DET3TC) It is possible to use this instrument to measure the resistance of a ground rod without disconnecting it from the rest of the system, thereby allowing normal operations within the installation to continue uninterrupted. This technique is known as the ‘Attached Rod Technique’...

  • Page 16: Description Of Tests For Model Det3Ta

    DESCRIPTION OF TESTS FOR MODEL (DET3TA) Battery-life reading (DET3TA) 4. The instrument will then check for ground noise voltage, the parameters of the current and voltage circuits and the integrity of the 1.Set the selector switch to fuse. 2. Press and hold the TEST button.

  • Page 17: Two-Terminal Resistance Measurement

    3. A voltage reading will be indicated on the analogue display, as shown in Figure 14. Figure 15: Resistance reading between ‘X’ and ‘Y’ terminals Three-terminal resistance measurement (DET3TA) Figure 14: Analogue display indicating ground noise voltage measurement Two-terminal resistance measurement (DET3TA) 1.
  • Page 18 down the ‘P Spike’ button. 10. Continuous illumination of the Rc LED indicates that the resistance of the current circuit is within limits. 5. A P Spike resistance reading will be indicated on the analogue display. 11. A resistance reading will be indicated on the analogue display, as shown 6.

  • Page 19: Preventative Instrument Maintenance

    0.01 Ω to 2,000 Ω Range: 5. Do not use alcohol-based cleaners, as these may leave a residue. 2% ±3 digits (DET3TC, DET3TD, DET4TD) Accuracy: 2.5% of scale length (DET3TA) Voltage Measurement 0 V to 100 V Range: 2% ±3 digits (DET3TC, DET3TD, DET4TD) Accuracy: 2.5% of scale length (DET3TA)
  • Page 20 Power Supply 8 x LR6 (AA), 1.5 V Alkaline Dry cell: 8 x 1.2V NiCAD, or 8 x 1.2V NiMH Rechargeable: Approx. 700 consecutive tests Battery life: Fuses 500 mA (F), HBC, 50 kA, 600 V (32 x 6 mm) Weight and Dimensions Weight: 1kg (all units) Dimensions: 203 x 148 x 78 mm (all units)

  • Page 21: Repair And Warranty

    Megger instruments, using genuine Kent CT17 9EN Norristown PA 19403 Megger spare parts. A list of approved companies is available from the UK England. U.S.A. address shown on this page. Spare parts are also available.
  • Page 22 E ausales@megger.com F +1 416 298 0848 E casales@megger.com Megger products are distributed in 146 countries worldwide. This instrument is manufactured in the United Kingdom. The company reserves the right to change the specification or design without prior notice. Megger is a registered trademark Part No.

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Det3tcDet3tdDet4td

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