Chauvin Arnoux
CA6255 10A Micro-Ohmmeter

Chauvin Arnoux CA6255 10 A Micro-Ohmmeter

• A precision low-resistance testing for professional applications

The Chauvin Arnoux CA6255 is a high-performance, laboratory-grade micro-ohmmeter designed for engineers and technicians who require exceptional accuracy when testing extremely low resistance values. Delivering up to 10 A of test current and resolutions as fine as 0.1 µΩ, the Chauvin Arnoux CA6255 Micro-Ohmmeter is a trusted solution for industries where precise bonding, continuity, and winding resistance measurements are critical.

Built around a robust 4-wire Kelvin measurement system, the CA6255 eliminates the influence of lead and contact resistances, ensuring that every reading reflects the true resistance of the test object. With support for resistances up to 2,500 Ω, selectable test modes for inductive and non-inductive components, and advanced temperature-compensation features, the CA6255 Micro-Ohmmeter stands out as one of the most versatile low-resistance testers available today.

Why Choose the Chauvin Arnoux CA6255?

The Chauvin Arnoux CA6255 is designed for tough environments. It works well in production lines, maintenance workshops, and on-site commissioning.

• The case is tough and rated IP53
• It has an easy-to-use front panel
• The large dual-display LCD helps operators
• This setup allows for quick, repeatable, and traceable results

The unit has a special current generator. It gives stable performance when testing inductive equipment like motors, transformers, or large wound parts. A built-in Pt100 temperature probe lets the instrument calculate resistance at a set temperature. This helps make consistent comparisons over time or between different measurements in changing conditions.

To enhance safety, the CA6255 detects live voltages at its terminals. It automatically stops testing when needed. After each measurement, it fully discharges the object being tested.

It can store up to 1,500 measurement results. Each result includes object and test indexing. This feature makes it great for traceability, quality checks, and long-term project records.

Chauvin Arnoux CA6255 Key Features:

• Extremely low-resistance capability: measurement range from 1 µΩ to 2,500 Ω with up to 0.1 µΩ resolution.
• Selectable test currents: from 0.1 mA to 10 A, depending on the chosen range.
• Three measurement modes:
  • Inductive
  • Non-inductive
  • Non-inductive with automatic trigger for rapid repetitive testing
• Automatic compensation of stray voltages, ensuring stable and reliable readings even in electrically noisy environments.
• Temperature-compensated measurements based on a Pt100 probe (automatic or manual).
• Programmable high/low alarms for production testing and pass/fail verification.
• Internal memory for 1,500 results, indexable by object and test number.
• PC connectivity via RS-232, fully compatible with Chauvin Arnoux DataView/MOT software for result export, trending, analysis, and PDF report creation.
• Large, backlit LCD display supporting dual-parameter visualisation.
• Durable IP53 enclosure suitable for field and workshop use.
• Integrated safety protections, including live-voltage detection and automatic discharge.

Typical Applications

• Chassis-earth / equipment bonding tests
• Contact resistance testing on circuit breakers, switches, and relays
• Surface metallisation and plating evaluation
• Transformer, motor, and generator winding resistance measurement
• Cable and busbar resistance verification
• Mechanical linkage quality checks
• Weld integrity and joint resistance testing

Why the CA6255 Outperforms Comparable Testers

Despite its advanced capabilities, the Chauvin Arnoux CA6255 remains compact and lightweight at approximately 4 kg, making it significantly more portable than many competing 10 A micro-ohmmeters. Its combination of high accuracy, range versatility, and robust safety features positions it as a standout instrument for electrical contractors, motor rewind workshops, transformer manufacturers, and power system engineers.

For businesses focused on compliance, quality assurance, or failure analysis, the Chauvin Arnoux CA6255 Micro-Ohmmeter offers a dependable and future-proof testing solution.

What comes with the Chauvin Arnoux CA6255?

• Chauvin Arnoux CA6255 Micro-Ohmmeter
• 3 m Kelvin clamp test lead set (10 A rated)
• Euro mains power cable (2 m)
• RS-232 communication cable
• MOT (Micro-Ohmmeter Transfer) software
• Full user manual and quick-start guides in multiple languages

Optional accessories such as pivoting Kelvin probes, pistol-style probes, mini Kelvin clamps, and Pt100 temperature probes are also available to support specialised measurement requirements.

❓ Frequently Asked Questions (FAQ)

Q1: What is the measurement resolution of the CA6255?

A. The instrument provides an ultra-fine resolution down to 0.1 µΩ, making it suitable for precision bonding and contact resistance testing.

Q2: Can the CA6255 test inductive components?

A. Yes. It includes a dedicated Inductive Mode that stabilises readings when measuring transformers, motors, and coils.

Q3: Does the CA6255 support temperature compensation?

A. Absolutely. Using an optional Pt100 probe, the CA6255 can automatically calculate resistance at a reference temperature for consistent comparisons.

Q4: How are test results stored?

A. The CA6255 includes memory for 1,500 measurement entries, organised by object and test number.

Q5: Is PC software included?

A. Yes. The instrument is supplied with MOT data-transfer software, compatible with DataView for advanced reporting.