What Is the Wrindu Digital Micro Ohmmeter Contact Loop Resistance Tester?
Wrindu Digital Micro Ohmmeter accurately measures contact resistance with high current output, precision, and stability, ideal for high-voltage switch testing.
The Wrindu RDHL-100H Digital Micro Ohmmeter is an advanced device designed to measure the contact resistance of circuit switches and control devices. This tester is especially useful for high-voltage switch maintenance and testing at power plants or electrical substations. With its high-precision technology, it helps ensure that switches and circuit breakers operate efficiently.
Key Features of Wrindu Digital Micro Ohmmeter Contact Loop Resistance Tester
| Feature | Description |
|---|---|
| High Current Output | Provides continuous DC current output of 50A or 100A, helping to break through oxide film on switch contacts for accurate resistance measurements. |
| Excellent Stability | Stable readings under strong electrical interference, with the last digit on the LCD display within a range of ±1, ensuring reliable and reproducible results. |
| High Precision Measurements | Uses high-speed 16-bit Σ-Δ ADC to process signals, with a resolution as low as 0.01μΩ, allowing highly precise resistance measurements. |
| Smart and Safe Operation | Features an intelligent system that adjusts measurement ranges based on signal size, and includes over-temperature protection to ensure safety during tests. |
| Durable and Reliable Design | Built with high-quality imported components, including temperature-compensating circuits and military-grade connectors, offering durability and shock resistance. |
| Customizable Test Settings | Users can set test durations from 5 to 599 seconds, offering greater flexibility and more powerful testing capabilities compared to similar devices. |
| User-Friendly Interface | Easy to operate with a rotating mouse for data entry, allowing users to set parameters, store results, and print test data conveniently. |
| Data Storage and Transfer | Includes a U-disk interface for storing test results on a USB drive, which can be transferred to a PC for further analysis using the provided software. |
| Portable and Easy to Transport | Compact and lightweight design, making it easy to carry to various testing locations. |
Specifications of Wrindu Digital Micro Ohmmeter Contact Loop Resistance Tester
| Specification | Details |
|---|---|
| Measurement Range | 0 to 2999.9 μΩ |
| Resolution | 0.01 μΩ (0–99.99 μΩ); 0.1 μΩ (100.0–2999.9 μΩ) |
| Test Current | DC 50A or 100A (fixed output) |
| Accuracy | ±(0.5% of reading + 2 digits) |
| Continuous Working Time | 5 to 599 seconds |
| Display | LCD |
| Communication Mode | U-disk (USB interface) |
| Power Supply | AC 220V ±10%, 50Hz |
| Power Consumption | 600W |
| Maximum Data Storage | 200 records |
| Service Conditions | Temperature: -10°C to 40°C; Humidity: ≤ 80% RH |
| Dimensions | 360 × 300 × 250 mm |
| Weight | 8 kg (excluding accessories) |
FAQs
What is the primary purpose of Micro Ohmmeter Contact Loop Resistance Tester?
A: It detects faulty, loose, or corroded connections in high-power systems to prevent arcing and fire risks, often focusing on circuit breaker contacts, busbar joints, and cable welds.
How does Micro Ohmmeter Contact Loop Resistance Tester achieve such high precision?
A: It uses the four-wire (Kelvin) method, which injects current through two leads while measuring the voltage drop across separate leads, eliminating the test leads’ resistance from the result.
What is the difference between a ‘Micro Ohmmeter’ and a ‘Contact or Loop Tester’?
A: A Micro Ohmmeter is for general low-resistance applications, while a Contact or Loop Tester is designed for power systems, using higher currents (50A-600A) to measure large switch contacts.
Why is ‘high current’ necessary for testing?
A: High current (50A-600A) is needed to break through oxidation layers on metal contacts, which standard multimeters cannot penetrate with their low currents.
What are ‘acceptable’ test results?
A: For high-voltage circuit breakers, resistance is typically below 10 µΩ. For multi-phase equipment, resistance should not differ by more than 50% between phases.
What key features should I look for?
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High Current Output: DC 100A to 200A for field use.
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Data Management: Bluetooth, App control, USB export, 500+ records storage.
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Safety & Durability: Over-temperature protection and rugged, IP-rated cases.
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Built-in Printing: Thermal printer for on-site documentation.
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