Digital microhmmeter MOM3

portablelow-resistancehigh-voltage

Overview
The MOM3 is a handheld 300 A micro-ohmmeter for checking and measuring contact resistances in high-voltage circuit breakers, disconnecting switches (isolators) and busbar joints. It uses ultracapacitor energy storage to generate high output current for accurate low-resistance measurements and provides Wi‑Fi and USB‑C connectivity for on-site data handling.

Key features

• High test current: up to 300 A for accurate measurement of very low resistances.
• Battery powered: rechargeable battery for mobile field testing; battery replacement by authorized service centers.
• Lightweight: approximately 1.1 kg for easy transport and one-person operation.
• Auto-ranging: automatic selection from 1 μΩ to 3000 mΩ.
• Ultracapacitor energy storage: low internal resistance enabling high discharge current.
• Connectivity: Wi‑Fi for wireless data transfer to Megger Egil200 and USB‑C for direct PC connection.
• Designed for use in high-disturbance, high-voltage on-site environments.

Included technology / capabilities

• Ultracapacitor technology: stores and quickly discharges large energy to produce high output currents compared with standard capacitors.
• Low internal resistance of the ultracapacitor improves energy delivery and measurement stability.
• Versatile for field use on various high-current contacts and busbar joints.

Interpreting test results
Readings are provided in micro-ohm (μΩ) and milli-ohm (mΩ) ranges. Accurate interpretation depends on consistent test setup: clean contact surfaces, correct contact pressure, stable test current and awareness of temperature effects. The device auto-ranging selects the most appropriate scale to support precise readings.

Common issues — indicators — recommended actions
Loose connections — Higher than expected resistance readings — Tighten and retest
Corrosion — Gradually increasing resistance over time — Inspect and clean contacts
Wear and tear — Fluctuating resistance, especially under load — Replace or repair components
Inconsistent results — Varying readings between tests in similar conditions — Check equipment calibration and repeat measurements

Documents available
Datasheet, user guide and application notes (including comparison and cable-setup guidance) are available for detailed specifications, setup and measurement examples.

Technical specifications

• Model: MOM3
• Maximum test current: 300 A
• Resistance measurement range: 1 μΩ to 3000 mΩ (auto-ranging)
• Power source: rechargeable battery (battery pack replacement by authorized service centers)
• Weight: approximately 1.1 kg
• Energy storage: ultracapacitor (low internal resistance)
• Connectivity: Wi‑Fi (wireless data transfer to Megger Egil200) and USB‑C for PC connection
• Designed for high-voltage environments and on-site disturbance conditions
• Warranty: 18 months (manufacturer-stated)