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MOM2 + Clamps


Price starts at $7,220.00

Product Code : BD-59092-US

Manufacturer : Megger

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The Megger MOM2 microhmmeter is a handheld contact resistance test instrument that weighs only 2 lbs. Thanks to a new ground breaking technology, this instrument can reliably produce a test current up to 220A. It also complies with IEC 62271-100, IEEE/ANSI C37.09-1999 and C37.100-1992 standards. It is battery operated and performs 2200 tests per charge.

 Designed for any customer that needs more than 50A or 100A to perform a low resistance measurement and store up to 190 records.

  • Up to 220 A

  • Battery operated

  • Handheld, lightweight – 2.2 lb (1 kg)

  • Safe test – DualGround™

  • Auto range: 1 µÙ to 1000 mÙ

  • Bluetooth® PC communication

  • Ultra capacitor technology (patent pending)


The MOM2 test system is designed to serve a number of applications. The most common are contact resistance measurements of low-, medium- and high-voltage breakers and also at bus-bar joints, and other high current links.If the contact resistance is too high, this will lead to power loss and temperature rise, which often leads to serious trouble. To avoid such problems, it is necessary to check the resistance at regular intervals.The following table demonstrates how important lowresistance is at high currents:

Current Contact resistance Power loss

  • 10 kA 1 mÙ 100 kW

  • 10 kA 0.1 mÙ 10 kW

  • 1 kA 1 mÙ 1 kW

  • 1 kA 0.1 mÙ 100 W

At 10 kA a contact with the resistance 0.1 mÙ gives a power loss of 10 kW. This power loss in one single point will definitely confer a temperature rise, which may result in overheating and possibly premature failure.

This instrument was designed to serve a number of applications. Some of which are shown below:

Circuit Breaker testing

     Circuit breaker contacts

     Connections to the breaker

      Testing of Bus-bar

     Bus-bar joints


      Everywhere you need to test a low resistance / high current connection


     Disconnecting devices

     Safety ground connections

     Welding points


-         Cables

       Testing switches, connectors and relays – To ensure contact resistance is within specified values.

       Cable resistance – too low means too much copper in cable (higher costs), too high means not enough copper (cables’ current carrying capacity compromised)

       Motors – To determine heat rise under load, measure winding resistance, check for short circuits or open circuits.

       Generators - To determine heat rise under load, measure winding resistance, check for short circuits or open circuits.

       Fuses - To ensure resistance is within specified values.

       Cable looms – Checking bonding and interconnections when installing in equipment, racks etc.

      UPS / Car batteries - Carrier to plate weld resistance, high resistance indicates poor weld quality that will restrict battery’s ability to carry current.

       Aircraft assembly and maintenance

       Main frame electrical and mechanical bonds to ensure a stable “ground plan” to protect aircraft from static electricity and lightning strikes.

       Static wick bonding

       Antenna bonds

       Control linkage bonding

      Battery connection and interconnection

       Integrity of structure and exhaust system

       Metallic coating resistance

       Railway / Railroad Industry

       Strap and wire bonds between rail segments – maintaining performance of control and telephone system. Minimizing power loss on three rail systems. However sometime higher test currents are specified.

       Cable joints – power system efficiency.

       Earth / ground bonds – e.g. lightning protection on structures. Ground mats, ground conductor rings, metal cladding, metal ceilings, metal floors, hand rails, seats etc. to limit step and touch potential.

       Platform edge doors – Earth / ground bonding (mainly underground systems)

      Aluminum refineries

      Graphite electrodes – to verify density

       Ship building or any metal structures

       Weld quality – measure at regular intervals along weld length looking for uniformity.

       Installed equipment bonds – to steel structure / hull.

       Raw material processing, e.g. cement plants

       Power carrying elements – installation and maintenance

      Ground bonds - cement is corrosive

      Automotive industry

      Cable leads in robot spot welders work-harden through flexing causing strands to break. Results in poor weld quality.

      Power Generation and Distribution

      Bus bars – lap joint tests to maintain low resistance, and hence maintaining efficiency and reducing likely hood of fire.

       Cable joints – including overhead lines. High impedance joint can explode.

       Fuses – connections

       Uninterruptible Power Supply (UPS)

       Battery straps – quality of connections. Preventing potential of fire and failure to operate

      Carrier to plate weld resistance – High resistance indicates poor weld quality that will restrict battery’s ability to carry current.

       Military vehicles – Trucks, tanks etc.

       Installed equipment such as radio equipment - ground bonding to vehicle chassis.

       Buildings – wiring, lightning protection bonds

       Various bond, both for power distribution and earth grounding – check for step and touch voltage safety in fault condition.

       Conduit continuity – metal conduit, detect corroded or loose threads etc.

       Pipe lines

       Cathodic protection – check connection etc. Tough environment ideal for the DLRO10HD

       Wind turbines Lightning protection – wing tip to base, or component parts in manufacture. Long test leads available for this application.

       Earth ground bonds – various


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