NXHL-200RM Loop Resistance Tester
The NXHL-200RM loop resistance tester is designed for high-precision measurement of contact resistance (loop resistance) in high-voltage switches, as well as for applications requiring high-current and micro-resistance measurements.
1. Purpose and Working Principle
1.1 Purpose
The NXHL-200RM loop resistance tester is designed for high-precision measurement of contact resistance (loop resistance) in high-voltage switches, as well as for applications requiring high-current and micro-resistance measurements.
1.2 Performance Characteristics
◊ Test Current: Capable of measuring resistance values at arbitrary current levels, overcoming the previous limitation of testing only at 200A current
◊ Display Technology: Six-digit half-color LCD display with real-time current/resistance readings
◊ High Current Output: Utilizes cutting-edge power supply technology for sustained stable output, addressing the transient output limitation of pulse-type power sources
◊ Strong Interference Resistance: Ensures reliable operation and measurement accuracy in any interference environment
◊ Advanced Intelligence: ARM-based control system featuring date clock, data storage, and automatic printing functions. Adjustable current output and timing with automated control
◊ User-Friendly Interface: Simple operation interface with intuitive measurement data display, including built-in Chinese-language paper changer printer
◊ Extended Service Life: Wide-temperature Chinese LCD display resolves display failure issues in high-altitude and direct sunlight environments. High-precision resistors effectively mitigate temperature-induced measurement errors, while aviation-grade connectors enhance vibration resistance
◊ Compact Design: Compact size and lightweight construction ensure easy portability
2. Structural Characteristics and Working Principle
2.1 Basic Principles
This testing instrument employs a standard four-wire measurement method to enhance measurement accuracy, particularly for low-resistance components. The core measurement circuit consists of a programmable constant current source, programmable preamplifier, and A/D converter. The central control unit regulates the constant current source to deliver a stable, high-precision current to the external load under test. Subsequently, the acquired data—including test voltage and current values—is processed to determine the actual resistance measurement.
3. Main technical features
1. Measurement range: 0–2000.000 μΩ; Resolution: 0.01 μΩ
2. Current measurement range: 20A–200A
3. Measurement accuracy: Class 0.5
4. Display interface: LCD with Chinese language support and 6.7-digit display
5. Operating mode: Continuous operation
6. Power supply: AC220V
7. Dimensions: (length×width×height, mm) 380×280×230
8. Ambient temperature range: -10°C to +40°C; Relative humidity: <80%