Metrel MI 3290 - Earth Analyzer
Overview
Features
Specifications
Calibration
MI 3290 Earth Analyser is a portable, battery or mains powered test instrument with excellent IP protection (IP 54 open case), intended for measurement of earth resistance, specific earth resistance and earth potential of various energetic and non-energetic objects.
The user can choose between different methods from classic 3 wire earth resistance measurement up to one or four clamp method for measurement of pylons. He has a choice of measurement methods with different frequency methods: single frequency or frequency sweep from 55 Hz to 15 kHz, HF method with 25 kHz and pulse method simulating the lightning strike. High electrical noise immunity makes this instrument best suited for industrial environment. Instrument is available in multiple sets which are a combination of different accessories and measurement functions.
Measuring Functions
- Earth Resistance 2,3,4 -pole.
- Selective Earth Resist (1 x clamp).
- Earth Resistance (2 x iron clamps).
- Specific Earth Resistance (Wenner and Schlumberger method).
- HF-Earth Resistance (25 kHz, acc. to IEEE_Std 81).
- Earth Resistance of mono pylons with 10 m flex clamp.
- Earth Resistance of multi–leg pylons with up to four flex clamps.
- Current measurement (Iron, flex clamps).
- Low Ohm measurement 7 mA and 200 mA.
- Earth Potential.
- Step and contact measurements.
- Impulse Earth measurement 10/350 µs.
Key Features
- Possibility of performing all types of earth measurements with a single instrument.
- Analysis of earth impedance as a function of the frequency due to a wide measurement frequency band (55 Hz ... 15 kHz).
- Earth measurements on pylons with protective earth cable connected.
- Measurement on mono towers and 4-leg tower.
- A wide variety of measuring clamps: from iron clamps to flex clamps with 10 m length.
- HF-Earth resistance measurement (acc. to IEEE_Std 81).
- Sweep mode Z(f) on screen.
- 3.4’’ colour LCD display with touch screen.
- Floating Mains (universal 90 … 260 V AC) or battery powered (built in fast charger).
- High degree of protection: IP 65 case closed, IP 54 case open.
- Checkbox - different self-check methods.
- DC resistance measurements.
- Impulse impendance measurement for simulating the lightning strike.
- Support for single or automated measurements.
- PC SW for measurement pre and post processing: preparation of the test structure, result download, tree-view, table view and graphical view, storing and printing.
Application
Measurement of protective earthing of:
- Mono and multi-leg pylons with protective earth cable connected.
- MV to LV transformer stations.
- Ski lifts, radio towers.
- Solar Power plants, wind and water turbine.
- Industrial areas.
Standards
Functionality
- EN 61557 - 5
- IEEE 80 – 2000
- IEEE 81 – 2012
- IEEE 142
- IEEE 367 – 2012
Electromagnetic compatibility
- EN 61326 Safety
- EN 61010 - 1
- EN 61010 - 2 - 030 c
- EN 61010 - 2 - 032
- EN 61010 - 031
Earth resistance 2, 3, 4 -pole
| Additional Info | Open-terminal test voltage 20 or 40 VAC Short-circuit test current > 220 mA Test frequency 55 Hz…329 Hz 659 Hz … 2.63 kHz 3.29 kHz … 15 kHz |
| Measurement Range | 0.00 Ω … 19.99 kΩ 0.00 Ω … 1.999 kΩ 0.00 Ω … 199.9 Ω |
| Uncertainty | ±(3 % of reading + 3 digits) ±(5 % of reading + 3 digits) ±(8 % of reading + 3 digits) |
Selective earth resistance with iron clamp
| Additional Info | Open-terminal test voltage 40 VAC Short-circuit test current > 220 mA Test frequency 55 Hz … 329 Hz 659 Hz … 1.50 kHz |
| Measurement Range | 0.00 Ω … 19.99 kΩ 0.00 Ω … 1.999 kΩ |
| Uncertainty | ±(8 % of reading + 3 digits) |
Selective earth resistance of pylons with flex clamp
| Additional Info | Open-terminal test voltage 40 VAC Short-circuit test current > 220 mA Test frequency 55 Hz…329 Hz 659 Hz … 1,50 kHz Passive mode |
| Measurement Range | 0.00 Ω … 19.99 kΩ 0.00 Ω … 1.999 kΩ 0.00 Ω … 19.99 kΩ |
| Uncertainty | ±(8 % of reading + 3 digits) |
Earth resistance with two iron clamps
| Additional Info | Test frequency 82 Hz, 164 Hz, 329 Hz |
| Measurement Range | 0.00 Ω … 9.99 Ω 10.0 Ω … 49.9 Ω 50.0 Ω … 100 Ω |
| Uncertainty | ±(5% of reading + 2 digits) ±(10 % of reading + 2 digits) ±(20 % of reading) |
Specific earth resistance ro Wenner and Schlumberger method
| Additional Info | Open-terminal test voltage 20 or 40 V AC Short-circuit test current >220 mA Test frequency 164 Hz |
| Measurement Range | 0.00 Ωm … 19.99 kΩm |
| Uncertainty | calculated value (consider uncertainty of 4 – pole measurement) |
Earth Potential
| Additional Info | Open-terminal test voltage 40 V AC Short-circuit test current >220 mA Test frequency 55 ÷ 329 Hz |
| Measurement Range | Ratio 0.001 … 1.000 |
| Uncertainty | ±(2 % of reading + 2 digits) |
HF-Earth Resistance 3 pole
| Additional Info | Open-terminal test voltage 40 VAC Short-circuit test current >40 mA Test frequency 25.000 Hz |
| Measurement Range | 0.00 Ω … 19.9 Ω 20.0 Ω … 299 Ω |
| Uncertainty | ±(3 % of reading + 2 digits) |
Impulse Earth Resistance
| Additional Info | Open-terminal test voltage ~140 V peak Short-circuit test current 2 A peak Impulse waveform 10 / 350 μs |
| Measurement Range | 0.0 Ω … 199 Ω |
| Uncertainty | ±(8 % of reading + 3 digits) |
DC Resistance RLOW
| Additional Info | Test current 200 mA |
| Measurement Range | 0.00 Ω … 1.99 kΩ |
| Uncertainty | ±(2 % of reading + 2 digits) |
DC Resistance CONT
| Additional Info | Test current 7 mA |
| Measurement Range | 0.00 Ω … 19.9 kΩ |
| Uncertainty | ±(3 % of reading + 2 digits) |
AC Impedance
| Additional Info | Test frequency 55 Hz … 15 kHz |
| Measurement Range | 0.00 Ω … 19.99 kΩ |
| Uncertainty | ±(3 % of reading + 2 digits) |
Current RMS (Iron Clamp)
| Additional Info | Nominal frequency 45 Hz …1.5 kHz |
| Measurement Range | 1.0 mA …7.99 A |
| Uncertainty | ±(2 % of reading + 3 digits) |
Current RMS (Flex Clamp)
| Additional Info | Nominal frequency 45 Hz …1.5 kHz |
| Measurement Range | 0.1 mA … 49.9 A |
| Uncertainty | ±(8 % of reading + 3 digits) |
Other Specifications
| Battery power supply | 14,4 V DC (4.4 Ah Li-ion) |
| Mains power supply | 90-260 VAC, 45-65 Hz, 100 VA (300 V CAT II) |
| Degree of protection | IP 65 (case closed) | IP 54 (case open) |
| Dimensions (w x h x d) | 36 x 16 x 33 cm |
| Display | 3.4'' colour LCD display with backlight and touch screen |
| Communication | USB, BT |
| Memory | >1GB |
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