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The Megger DET2/2 Auto Earth Tester is a robust compact instrument designed for measuring earth electrode resistance and soil resistivity. It uses the four terminal method of measurement which eliminates the resistance of the current circuit from the measurement. The circuit design ensures that the resistance of the potential circuit does not affect the measurement during practical testing. The instrument is microprocessor controlled and provides a flexible, ‘user-friendly’ approach to earth testing by giving good error detection capabilities and full test information on a large easily readable alpha-numeric display. A simple key pad can be used to adjust the test frequency, the test current level and the filtering so that adverse conditions influencing the test may be overcome.
Features
- High resolution – 1 mΩ
- High accuracy for earth electrode and soil resistivity testing
- A robust, versatile instrument with IP54 protection
Specifications
| Earth Resistance Range | 0.010 Ω to 19.99 kΩ (auto-ranging), 1 mΩ resolution. |
| Accuracy (23°C ±2°C) | ±0,5% of reading ±2 digits |
| Service Error | ±5% of reading ±2 digits ±10 mΩ (meets VDE service error over 50 mΩ) |
| Comply with Standards | BS 7430 (1991) |
| VDE 0413 Part 7 (1982) |
| Test Frequency | 105 to 160 Hz reversing d.c. (50 Hz operation default to 128 Hz, 60 Hz operation default to 150 Hz) Set in steps of 0,5 Hz |
| Test Current | 50 mA max (selectable high and low levels) |
| Maximum Output Voltage | < 50 V r.m.s. |
| Maximum Interference | Typically 40 V peak-to-peak (50/60 Hz, sinusoidal nature) |
| Maximum Current Spike (Loop) Resistance |
| High Range | Low Current | Current |
| (RE) | (RC) | (RC) |
| 0.010 to 0.499 Ω | 5 kΩ | 1 kΩ |
| 0.500 to 1.999 Ω | 5 kΩ | 3 kΩ |
| 2.000 to 19.99 Ω | 10 kΩ | 5 kΩ |
| (over 20 Ω RC > 20 kΩ) |
| Maximum Potential Spike (Loop) Resistance |
| High Range | Low Current | Current |
| (RE) | (RP) | (RP) |
| 0,010 to 0,499 Ω | 11 kΩ | 11 kΩ |
| 0.500 to 1.999 Ω | 21 kΩ | 11 kΩ |
| 2.000 to 19.99 Ω | 21 kΩ | 11 kΩ |
| (over 20 Ω RP > 20 kΩ) |
Applications
- Communications earthing systems and difficult testing environments
- Used to test in accordance with BS 7430 (1991), the IEE Wiring Regulations and VDE 0413 part 7 (1982)
- Soil resistivity measurements
- Perform archeological and geological investigations