Contact Loop Resistance Tester

A high-precision contact loop resistance tester 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.

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.

1.High Accuracy & Resolution: Achieved via precision reference sources, high-resolution ADCs, low-noise amplifiers, and advanced algorithms.

2.Stable High Test Current:

Magnitude: Sufficient current (e.g., 100 A DC for breakers) generates measurable millivolt signals on μΩ resistances and simulates real operating conditions.

Stability: Essential for accuracy; requires robust constant-current control.

3.Strong Noise Immunity: Shielding, filtering (e.g., line frequency rejection), and DSP techniques (e.g., digital filtering) ensure reliability in noisy environments (e.g., substations).

4.Rapid Measurement: Completes tests in seconds to minimize high-current exposure and boost efficiency.

5.Temperature Compensation: Compensates resistance values for temperature variations (via sensors or manual input).

6.Digital Processing & Display: Microprocessor-controlled for automated measurement, data storage, limit comparison, and communication (USB/Bluetooth/RS232). Clear LCD shows RxRx​, current, time, etc.

7.Safety & Protection:

Overcurrent/voltage/temperature protection.

Complies with safety standards (e.g., IEC 61010).

Automatic discharge post-test.

8.Portability: Compact, lightweight designs with rechargeable batteries for field use.

9.Data Management: Stores results for export, analysis, and reporting.

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