Megger MJOLNER 200 - High-Accuracy Micro-Ohmmeter with DualGround™

The Megger MJOLNER 200 is a rugged, field-ready micro-ohmmeter with DualGround technology, engineered for technicians who need fast, safe and ultra-precise low-resistance measurements. Designed for high-voltage substations and industrial power systems, the MJOLNER 200 delivers true DC, ripple-free current up to 200 A, ensuring repeatable accuracy when testing circuit breakers, bus-bar joints, disconnectors, welded connections and other high-current links.

Its suitcase-style enclosure offers exceptional durability. When latched shut, the unit is protected against dust, sand and water ingress. This makes the Megger MJOLNER 200 ideal for demanding outdoor testing environments where reliability is essential.

Why Choose the MJOLNER 200?

The Megger MJOLNER 200 stands out as one of the most reliable solutions for contact resistance testing. It incorporates advanced measurement algorithms, a 5” high-visibility touchscreen, automatic data logging via USB and robust safety features. Its ability to perform resistance checks with both sides of the test object grounded, thanks to the integrated DualGround™ capability, provides a safer workflow by eliminating unnecessary exposure to live potentials.

The DualGround method allows testing with both ends of the circuit breaker grounded simultaneously, significantly reducing hazards while speeding up the measurement process.

Megger MJOLNER 200 Key Features

• True DC, ripple-free output up to 200 A, ensuring accurate measurements on high-current equipment
• DualGround™ for safer, faster testing with the test object grounded on both sides
• 5” IPS touch display for clear, intuitive operation even in bright outdoor conditions
• Automatic data logging to USB memory in CSV format for seamless reporting
• Lightweight, IP-rated suitcase design - the unit even floats when closed
• Built-in thermal protection that automatically derates current if internal temperature rises
• PC integration via MJÖLNER Win software for remote operation and report generation
• Optional remote control and Bluetooth dongle for mobile-based testing

MJOLNER 200 Applications:

The MJOLNER 200 is the preferred micro-ohmmeter with DualGround for:

• Contact resistance testing on low, medium and high-voltage circuit breakers
• Measuring bus-bar joints and large conductor assemblies
• Diagnosing oxidation, contamination or loose connections
• Routine maintenance aligned with common breaker testing standards

Low resistance is critical for preventing power loss and hotspot failures. The MJOLNER 200 ensures issues are identified long before they escalate.

MJOLNER 200 Options:

• BD-19100 - MJOLNER 200 (no accessories)
• BD-19191 - MJOLNER 200 with 5 m cable set and accessories
• BD-19193 - MJOLNER 200 with DualGround kit and accessories, includes 200 A/1 V clamp

The various models of the MJOLNER 200:

• (BD-19100) MJOLNER 200 Micro-Ohmeter - No Accessories
• (BD-19191) MJOLNER 200 Micro-Ohmeter - 5M c/w Accessories
• (BD-19193) MJOLNER 200 Micro-Ohmeter - 5M DG c/w Accessories; Clamp 200 A/1 V

❓ Frequently Asked Questions (FAQ)

Q1: What makes the MJOLNER 200 safer than conventional micro-ohmmeters?

A. Its DualGround™ design keeps both sides of the breaker grounded during testing, reducing operator exposure to hazardous voltages.

Q2: Can I log and export test results easily?

A. Yes. All test data can be logged automatically to a USB stick in CSV format, which can be opened in common data analysis tools.

Q3: Does it support remote testing?

A. Yes. The unit supports an optional handheld remote control and Bluetooth dongle for app-based operation.

Q4: Is the MJOLNER 200 suitable for outdoor substations?

A. Absolutely. Its rugged case design is built for high-voltage substation and industrial environments.