The function of a resistance tester
Release Time:
2025-08-16
The resistance tester is primarily used to measure various types of resistance values (such as insulation resistance, grounding resistance, DC resistance, etc.), helping to evaluate the performance and safety of electrical equipment, materials, or circuits.
The resistance tester is primarily used to measure various types of resistance values (such as insulation resistance, grounding resistance, DC resistance, etc.), helping to evaluate the performance and safety of electrical equipment, materials, or circuits.
Overview of the Core Role
The core function of a resistance tester is to apply a test voltage or current, calculate and display the resistance value based on Ohm's Law, thereby determining the conductivity, insulation properties, or grounding reliability of the object being tested. This instrument is widely used in fields such as power, electronics, and telecommunications, ensuring that equipment meets safety standards and helping to prevent failures.
**Main Types and Their Specific Functions**
Insulation resistance tester.
Function: Measure the insulation resistance of electrical equipment (such as transformers, generators, and cables), assess whether the insulation material meets safety requirements, and prevent leakage or breakdown accidents.
Operating mode: Outputs a DC voltage ranging from 50V to 5000V, with a measurement range of up to 0.1MΩ to 400GΩ. It supports automatic range switching and features discharge protection.
Ground resistance tester.
Function: Detects the grounding resistance of grounding devices (such as lightning rods and equipment enclosures), ensuring that the grounding system effectively diverts fault currents and safeguards both personal safety and equipment integrity.
Work method: By testing the power supply output current, the circuit collects the response signal, and the display instrument directly shows the resistance value. The alarm circuit triggers an alert when the threshold is exceeded.
DC Resistance Tester.
Function: Measures the DC resistance of inductive loads (such as transformer windings and motor coils), helping to diagnose welding quality, tap switch contact conditions, or conductor continuity.
Working method: Employs the four-wire method to eliminate lead resistance errors, with a constant-current source offering multiple current settings (2mA–2A) and achieving Class 0.2 accuracy. It supports fast measurements and data storage.
Application areas covered
**Power Equipment Maintenance:** Used for acceptance tests and routine inspections of transformers, current transformers, and generators, verifying insulation or grounding performance.
Electronics and Materials R&D: Testing conductor conductivity and material impedance, assisting in circuit design or new product development.
Safety Assessment: Detect insulation aging or ground fault failures in hazardous chemical industries or communication lines to prevent fire or electric shock risks.
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