Megger DET2/3 High Resolution Earth Tester

The DET2/3 is a robust and compact automatic earth (ground) test instrument designed to measure earth electrode resistance and soil resistivity. For use on large or more complex earth systems, which include communications earth systems and difficult test environments, it can be used to test in accordance with BS 7430 (earthing / grounding), BS-EN-62305 (Lightning Protection), BS-EN-50122-1 (Railway Applications), and IEEE Standard 81.

Test frequency, test current and filtering can be quickly and easily adjusted so that adverse conditions, which can influence the test, can be overcome, and a wide band of test current frequencies, with a resolution of 0.5 Hz, can be used to eliminate errors caused by noise in the earth.

With its microprocessor controlled system it provides a flexible and ‘user-friendly’ approach to earth tests by the provision of excellent error detection capabilities and full test information shown on a large colour display. The DET2/3 can provide a live trace of its measurements, which graphically shows the amount of noise from the system under test – a powerful diagnostic tool for the expert earth (ground) test engineer.

The DET2/3 also includes an automatic frequency selection feature that scans for frequencies with the lowest noise level and then runs a test at that frequency.

The selected test current frequency, test current level and the increased filtering option are stored in memory for use in subsequent tests.

Use of the latest processors and a large internal memory allows for immediate calculations of resistivity (Wenner or Schlumberger method) and the ability to save a complete days’ worth of test results. Test result data can be downloaded directly through a USB flash drive or straight to a Windows PC running PowerDB™ software.

Megger DET2/3-HIGH RESOLUTION EARTH TESTER specifications:

• 2, 3 and 4 pole resistance measurements:

• Range:0.001 Ω to 20.00 kΩ auto range
• Display:Four digit display
• Test frequency 2P, 3P & 4P resistivity:10 Hz to 200 Hz in steps of 0.5 Hz
• Test frequency dual clamp, 3p ART & 4P ART:70 Hz to 200 Hz (steps of 0.5 Hz)
• Test current:50 mA max
• Maximum output voltage:Less than 50 V rms
• Maximum interference:Up to 50 V pk to pk

• 3 and 4 pole ART (selective) resistance measurements:

• Range:0.01 Ω to 10.00 kΩ Auto range
• Accuracy:±5% of reading ±3 digits at 23 °C ±2 °C

• Stakeless resistance measurement:

• Range:0.01 Ω to 200 Ω
• Accuracy:±7% accuracy, ±3 digits

• Continuity:

• Range:0.01 Ω to 1 kΩ (3 digits)
• Accuracy:±3% (±2 digits)
• Test Current:Up to 205 mA
• Lead Null:< 10 Ω

• Leakage Current:

• Range:0.00 A to 2.00 A
• Accuracy:±5% (±3 digits)

• Instrument Specifications:

• Display:5.25-inch QWVGA, daylight viewable backlit colour
• Storage temperature:-20 to 60 °C
• Temperature coefficient:< ±0.1% per °C over operating temp
• Altitude:Up to 2000 m above sea-level.
• Measurement rating:CAT IV 300 V
• Measurement output rating:±50 V 1 A, ac or dc
• Power supply:Internal Li-ion battery or external 12-18 V, 65 W, DC supply
• Battery life:Up to 10 hrs use