300A Handheld Micro-ohmmeter
Description
The 300 A Handheld Micro-ohmmeter is a powerful, portable instrument designed to measure very low resistances—typically in micro-ohms—with high accuracy at high current output. Delivering up to 300 A DC, it is well-suited for testing circuit breaker contacts, busbar joints, transformer tap changers, disconnectors, and welded bonds, where precise resistance measurement is essential to verifying integrity and performance. The handheld design allows for field portability without compromising power or accuracy, making it a preferred choice for utilities and HV service providers conducting commissioning, maintenance, or fault-finding.
Features
- High-output test current up to 300 A DC
- Resistance measurement range: 0.1 µΩ to 20 mΩ (typical)
- Four-terminal (Kelvin) measurement eliminates lead resistance errors
- Lightweight, handheld design for maximum portability
- Large digital display with real-time measurement updates
- Auto-hold or continuous test modes available
- Audible indicators and over-temperature protection
- Rechargeable battery or AC mains operation (model dependent)
- Supplied with heavy-duty test leads and clamps
- Ideal for substations, switchyards, and industrial HV environments
300A Handheld Micro-ohmmeter
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Frequently Asked Questions
300A Handheld Micro-ohmmeter
1. What does a micro-ohmmeter measure?
It measures extremely low resistance values, typically in the micro-ohm range, to assess the quality of electrical connections in high-current paths.
2. What makes this model different?
This unit delivers up to 300 A DC, which ensures more accurate readings in real-world conditions, especially where surface oxidation or high-current validation is needed.
3. What applications is it used for?
- Circuit breaker contact resistance testing
- Busbar and switchgear joint testing
- Transformer tap changer resistance
- Earth bond verification
- Weld integrity testing
4. Is it safe to use in substations?
Yes. It’s designed for field and substation use, with rugged construction, insulated clamps, and built-in safety features.
5. Does it require special leads?
Yes. It uses Kelvin-connected high-current leads to ensure accurate measurements. These are supplied with the rental.
6. Can it log or store test results?
Some models include internal memory or USB connectivity. Please specify if data storage or PC connection is required for your application.
7. What’s included in the rental?
- 300 A Micro-ohmmeter main unit
- High-current test leads and clamps
- Power adapter or charger
- Quick-start guide and transport case
8. Do you offer training or support?
Yes. We provide remote support for setup, connection guidance, and interpreting resistance values relative to industry standards.
9. What’s the minimum hire period?
Minimum rental period is 3 days, with weekly and monthly discounts available.
10. Do you deliver Australia-wide?
Yes. We provide nationwide delivery and collection. You may also arrange your own logistics if preferred.
11. Is a deposit or insurance required?
A security deposit may apply. For high-current equipment, proof of business insurance may be requested. Full terms are outlined in your quote.
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