Product introduction
UHV high-precision contact loop resistance tester manufactures is an electronic measuring instrument specifically designed for precise measurement of low value resistance (usually at the micro ohm level, μ Ω). Its core application is to evaluate the connection quality of current conducting circuits in electrical equipment, and to determine whether there are problems such as poor contact, oxidation, looseness, or deterioration at conductor connection points (such as switch contacts, circuit breaker contacts, busbar joints, cable terminals, welding points, etc.) by measuring the circuit resistance.
Technical Parameters
| Measuring range | 50A 0～10mΩ |
| 100A 0～5mΩ | |
| 150A 0～3.333mΩ | |
| 200A 0～2.500mΩ | |
| Resolution | 0～99.99μΩ, 0.01μΩ |
| 100.0～10000.0μΩ,0.1μΩ | |
| Test current | DC 50A, 100A, 150A, 200A four-speed fixed output |
| measurement accuracy | ±(0.5% rd+2d) |
| Operating Time Options | Quick, 10s, 30s, 60s |
| Display method | 4-inch touchscreen |
| communication mode | U disk dump |
| Working power | AC220V±10% 50Hz |
| Total power | 1000W |
| Maximum storage record | 200 |
| working environment | Temperature: -10°C~40°C, humidity: ≤80%RH |
| Dimensions | 390×300×200 mm3 |
| Weight | 7kg(No attachments) |
Key Advantages
Key Advantages of the Circuit Resistance Tester
1. Strong Penetration Capability – Delivers continuous large current (not just instantaneous pulse), effectively breaking through oxide films on switch contacts to ensure accurate measurement results.
2. High Stability – Maintains stable LCD readings within ±1 word even under strong interference, with excellent repeatability.
3. Ultra-High Precision – Uses dual-channel 16-bit Σ-Δ AD sampling and advanced digital signal processing, achieving a resolution of 0.01 μΩ, outperforming many imported large-current micro-ohmmeters.
4. Intelligent Protection – Equipped with an imported high-performance CPU that automatically switches ranges based on signal strength, plus an overtemperature protection circuit that cuts off output when temperature exceeds the set limit for safe operation.
5. Superior Quality Components – Key parts are imported, with a temperature compensation circuit to eliminate environmental temperature effects and military-grade connectors for enhanced vibration resistance.
6. Versatile Configuration – Offers selectable currents (50A, 100A, 150A, 200A) and test durations (fast, 10s, 30s, 60s), far surpassing similar instruments.
7. User-Friendly Interface – Features a touchscreen for convenient operation, with real-time data saving, printing, and independent date/time settings.
8. Data Export – Supports USB transfer for easy data analysis with host computer software.
9. Portable Design – Compact, lightweight, and easy to carry for field use.
Core Purpose
1.Diagnose Electrical Connection Integrity
Detects abnormal resistance increases (μΩ-level) in conductive paths caused by poor contacts, oxidation, or loosening.
2.Ensure Equipment Safety
Validates contact resistance compliance in critical devices (e.g., circuit breakers, transformers) per standards (IEC 62271, GB 50150).
3.Preventive Maintenance
Identifies latent faults through periodic testing to avoid equipment failure or accidents.
What Test Current Options Does UHV Provide?
UHV offers multiple contact resistance tester configurations to meet different testing requirements.
Available current options include:
50A
100A
150A
200A
For power utility applications, UHV follows the requirements of national and industry standards, which recommend 100A DC or above for circuit breaker and disconnect switch contact resistance measurement to ensure accurate results.
Typical applications:
| Test Current | Application |
|---|---|
| 50A | General maintenance |
| 100A | Circuit breakers, disconnectors |
| 150A | GIS equipment |
| 200A | High-voltage substations and utility testing |
How Accurate and Stable Are UHV Contact Resistance Testers?
Accuracy and long-term stability are critical for micro-ohm measurements.
UHV contact resistance tester manufactures provide:
Resolution up to 0.01μΩ
Measurement accuracy up to ±(0.5% rd + 2d)
High-frequency switching power supply technology
Digital signal processing design
Stable constant-current output
These features ensure reliable measurements even when testing extremely low contact resistance values.
Are UHV Testers Suitable for GIS and High-Voltage Equipment?
Yes.
UHV contact resistance tester factory is specifically designed for:
High-voltage circuit breakers
GIS switchgear
Disconnect switches
Busbar joints
Grounding switches
High-current conductors
They are widely used by:
Power utilities
Substations
Power generation plants
Electrical equipment manufacturers
The contact resistance tester supplier fully meets the requirements of high-voltage switch maintenance and loop resistance testing.
Why Choose UHV?
✔ Professional manufacturer of high-voltage electrical testing equipment
✔ Micro-ohm resolution up to 0.01μΩ
✔ Test current options up to 200A DC
✔ Designed for GIS, circuit breakers, disconnectors, and busbars
✔ Strong anti-interference performance
✔ Compliant with power industry standards
✔ Data storage and USB export capability
✔ Factory testing and quality documentation
✔ Global technical support
✔ OEM/ODM customization available
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