Description

The Chauvin Arnoux CA10 MicroOhm meter A highly autonomous, portable micro-ohmmeter built for fieldwork where mains power is inaccessible. It relies on a heavy-duty internal battery and a straightforward manual interface to provide highly accurate low-current testing.

• Operating Principle: True 4-wire Kelvin bridge measurement with manual polarity reversal to cancel out stray thermal electromotive forces (EMFs).
• Test Current: Maximum of 10A DC.
• Measurement Ranges: 6 selectable ranges from 0–2000 µΩ up to 0–200 Ω.
• Best Resolution: 1 µΩ (on the lowest 2000 µΩ range).
• Display: 2000-count LCD digital display.
• Power Supply: Built-in rechargeable Cadmium-Nickel battery pack with dual-voltage (110V/220V) charging.
• Physical Specs: Housed in a sealed worksite case; highly portable for remote field maintenance.
• Primary Application: Verifying the integrity of medium-voltage switchgear, busbar joints, metallic bonds, and smaller transformer windings.

2. Wuhan UHV-HTHL 200P Contact Resistance Tester

A modern, heavy-duty Chinese-manufactured tester utilizing a high-frequency switching power supply to generate massive, stable DC currents. It is designed around a digital, touchscreen-based workflow.

• Operating Principle: High-frequency constant-current switching power supply paired with a precision four-terminal measurement circuit.
• Test Current: Selectable fixed outputs of 50A, 100A, 150A, and 200A DC.
• Measurement Range: 0 to 2.5 mΩ (when testing at 200A) and up to 10 mΩ (at 50A).
• Best Resolution: 0.01 µΩ.
• Accuracy: ±(0.5% reading + 2 digits).
• Data & Display: Features a 4-inch color touchscreen interface, onboard storage for 200 records, an integrated thermal printer, and a USB port for data export.
• Physical Specs: Typically weighs around 10 kg depending on the specific chassis revision.
• Primary Application: Heavy-load testing of Extra High Voltage (EHV) circuit breaker contacts and substation distribution nodes.

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