Megger DET2/3 – Ground Tester

• High resolution of 1 mΩ, ideal for large ground systems
• Versatile test modes
• High accuracy for ground electrode grid and soil resistivity tests
• Rechargeable battery power that can last all day with a fast re-charge (up to 10 hours)
• Robust instrument with IP65 protection

The Megger® DET2/3 automatic ground test instrument is robust, compact, and designed to measure ground electrode resistance and soil resistivity. It provides a full range of test methods and excels at the four-terminal method of measurement, which eliminates the resistance of the current circuit from the measurement.

The DET2/3 is a reliable instrument for use on large or more complex ground systems, which include communications ground systems and difficult test environments. It can be used to test in accordance with BS 7430 (earthing / grounding), BS-EN-62305 (lightning protection), IEEE Standard 81, and railway applications.

Soil resistivity measurements are used to establish the optimum electrode design and site, as well as archaeological and geological investigations.

The DET2/3 is housed in a dual case design, which includes a tough outer case to protect the tester from knocks/drops and an inner fire retardant case.

The DET2/3 provides accurate 1 mΩ resolution measurements of ground electrode resistance.

With its microprocessor-controlled system, it provides a flexible and ‘user-friendly’ approach to ground tests by the provision of excellent error detection capabilities and full test information shown on a large color display.

Test frequency, test current, and filtering can be quickly and easily adjusted so that adverse conditions, which can influence the test, can be overcome.

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 ground.

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.

Fall of Potential Test

• For measuring the resistance between an installed system and the soil
• Auxiliary current probe must be placed far outside the zone of influence
• Several readings are taken to build the graph and determine the true resistance

• Many test methods to:
• Characterize soil
• Check resistance between a system & soil
• All tests must set:
• Test signal power (V & I)
• Test signal frequency
• Test Frequency setting is a balance between avoiding noise and getting good soil penetration

• Systems must be checked regularly
• Large systems must have very low resistances < 90mΩ
• Noisy readings are common in built-up areas