MI 3201 TeraOhm 5 kV insulation tester is a portable instrument intended to measure insulation resistance through the use of high voltage DC test voltages up to 5 kV. The large LCD screen allows real-time R(t) graphs to be displayed.
This insulation tester is also being sold as Greenlee 5990A
MEASURING FUNCTIONS
Top-Tier 5kV Insulation Resistance Tester with 10 TΩ Range and PC Connectivity
Product Overview:
The Metrel MI 3201 Teraohm 5kV Plus is a high-end digital insulation resistance tester designed for demanding industrial, utility, and laboratory environments. It offers adjustable test voltages from 50 V to 5000 V and insulation resistance measurement up to 10 TΩ, making it ideal for advanced diagnostics of motors, generators, transformers, switchgear, and high-voltage cables.
Packed with features such as Polarization Index (PI) and Dielectric Absorption Ratio (DAR) testing, graphical display, and USB data export, the MI 3201 is built for professionals who need precise measurements, traceable results, and reliable performance under tough conditions.
Key Features:
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Test Voltage Range: 50 V to 5000 V (adjustable in 25 V steps)
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Insulation Resistance Range: Up to 10 TΩ (10,000 GΩ)
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PI & DAR Testing – Predict insulation degradation before failure
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Ramp Test and Step Voltage Test Modes
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Real-Time Graphical Display of Test Results
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USB Port + Metrel Software for data download and analysis
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Automatic Discharge of Capacitive Load
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Robust Carrying Case Included
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CAT IV 600 V Safety Rating (EN 61010-1)
Best For:
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Substation and power grid maintenance
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Transformer and high-voltage motor diagnostics
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Industrial insulation audits and compliance testing
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Manufacturers performing type and routine tests
What’s Included:
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Metrel MI 3201 Teraohm 5kV Plus
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High-voltage test leads
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USB cable and Metrel software
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Carrying case
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Instruction manual
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Batteries (pre-installed)
🔍 How It Compares:
| Feature |
Metrel MI 3201 |
Metrel MI 3202 |
Fluke 1555 |
| Max Test Voltage |
5000 V |
5000 V |
10,000 V |
| Max Resistance Range |
10 TΩ |
10 TΩ |
2 TΩ |
| PI/DAR Test Capability |
✅ Yes |
✅ Yes |
✅ Yes |
| Graphical Display |
✅ Yes |
✅ Yes |
✅ Yes |
| Data Export |
✅ USB |
✅ USB |
✅ USB |
| Best Use |
Heavy industrial + lab |
Utility & field diagnostics |
Ultra high-voltage testing |
- Automated testing - PI, DD, DAR calculations with automated resistance ranging (AR). All data is displayed during one single measurement.
- Fault finding - Fully programmable step voltage and withstanding voltage test functions to assist in diagnosing faults in insulation.
- R(t) graph - Real time resistance against time graph plotting facility to graphically illustrate the response of a material to an applied test voltage.
- Faster testing - High 5 mA charging current quickly charges capacitive loads.
- Accurate - Selectable noise rejection filters (up to 5 mA) and shielded cables as standard ensure accurate readings.
- Safe - High CAT IV, 600 V voltage protection
- Portable - Lightweight 3 kg design with carry handle and shoulder strap.
MI 3201 Standard set
- Instrument TeraOhm 5 kV Plus
- Small soft carrying bag
- Mains cable
- 10 kV shielded test lead, black, 2 m
- 10 kV shielded test lead, red, 2 m
- 10 kV crocodile clip, 2 pcs (black, red)
- Guard lead, green, 2 m
- Crocodile clip, green
- 6 x 1.2 V NiMH rechargeable batteries, type C
- Handbook on CD
- Instruction manual
- Calibration certificate
Download:
