Digital microhmmeter MOM3

portablelow-resistancebattery-powered

Overview
The MOM3 is a handheld 300 A micro-ohmmeter for measuring contact resistance in high-current systems such as high-voltage circuit breakers, disconnect switches and busbar joints. It uses ultracapacitor energy storage to deliver high test current from a compact, battery-powered unit suitable for field use.

Key features and included technologies

• Ultracapacitor technology: stores and releases high energy to provide large discharge currents required for precise low-resistance measurements.
• Low internal resistance: ensures efficient energy discharge and consistent measurement accuracy.
• High test current: up to 300 A for reliable micro-ohm and milliohm testing.
• Battery-powered: rechargeable battery pack for mobile field testing without mains supply.
• Lightweight, handheld design: approximately 1.1 kg for easy transport and on-site operation.
• Auto-ranging: automatic selection from 1 μΩ to 3000 mΩ for broad measurement coverage.
• Connectivity: Wi‑Fi for wireless data transfer to compatible Megger analysis devices and USB‑C for direct data export to computers.

Applications
The MOM3 is intended for contact resistance and low-resistance measurements on circuit breaker contacts, disconnecting switches (isolators), busbar joints and other high-current connections in power distribution and industrial electrical systems.

Practical measurement guidance

• Measurement range: auto-ranging covers 1 μΩ to 3000 mΩ.
• Preparation: ensure clean contact surfaces, appropriate contact pressure and connection near the test point for accurate micro-ohm readings.
• Test protocol: perform repeated measurements to verify stability and detect wear, corrosion or intermittent contacts.

Common issues and indicators
Issue | Indicator | Action
Loose connections | Higher than expected resistance readings | Tighten connections and retest
Corrosion | Gradually increasing resistance over time | Inspect and clean contacts
Wear and tear | Fluctuating resistance, especially under load | Repair or replace components
Inconsistent results | Varying readings between similar tests | Check equipment calibration and connections

Further reading and documents
Datasheets, user guides and application notes are available for detailed procedures, cabling recommendations and firmware/maintenance information.

Technical specifications

• Model: MOM3
• Maximum test current: up to 300 A
• Measurement range: auto-ranging from 1 μΩ to 3000 mΩ
• Power source: rechargeable battery pack (battery service via authorized centers)
• Energy storage: ultracapacitor for high discharge current
• Weight: approximately 1.1 kg
• Connectivity: Wi‑Fi (wireless transfer to compatible analysis equipment), USB‑C for computer export
• Designed for: contact resistance measurement on circuit breakers, disconnecting switches and busbar joints