TheMegger MOM2 microhmmeter is a handheld contact resistance test instrument thatweighs only 2 lbs. Thanks to a new ground breaking technology, this instrumentcan reliably produce a test current up to 220A. It also complies with IEC62271-100, IEEE/ANSI C37.09-1999 and C37.100-1992 standards. It is batteryoperated and performs 2200 tests per charge.
Designed for any customer that needs more than 50A or 100A to perform alow resistance measurement and store up to 190 records.
Up to 220 A
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 toserve a number of applications. The mostcommon are contact resistance measurements oflow-, medium- and high-voltage breakers andalso at bus-bar joints, and other high current links.If the contact resistanceis too high, this will lead to power loss andtemperature rise, which often leads to serious trouble.To avoid such problems, it is necessary to check theresistance at regular intervals.The following table demonstrates how importantlowresistance is at high currents:
Current Contact resistance Powerloss
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 theresistance 0.1 mÙ gives a power loss of 10kW. This power loss in one single point willdefinitely confer a temperature rise, which may result inoverheating and possibly premature failure.
Thisinstrument was designed to serve a number of applications. Some of which areshown below:
Circuit breaker contacts
Connections to the breaker
Everywhere you need to test a lowresistance / high currentconnection
Testing switches, connectors and relays Toensure contact resistance is within specified values.
Cableresistance too low means too much copperin cable (higher costs), too high means not enoughcopper (cables current carrying capacity compromised)
Motors To determine heat rise under load, measurewinding resistance, check for short circuits or opencircuits.
Generators– To determine heat rise under load, measurewinding resistance, check for short circuits oropen circuits.
Fuses– To ensure resistance is within specified values.
Cablelooms Checking bonding and interconnectionswhen installing in equipment, racks etc.
UPS / Car batteries – Carrier toplate weld resistance, highresistance indicates poor weld quality that will restrict batterys ability tocarry current.
Aircraftassembly and maintenance
Mainframe electrical and mechanical bonds to ensure a stable ground planto protect aircraft from static electricity and lightning strikes.
Battery connection andinterconnection
Integrityof structure and exhaust system
Railway/ Railroad Industry
Strapand wire bonds between rail segments maintaining performance of controland telephone system. Minimizing power loss on three rail systems.However sometime higher test currents are specified.
Cablejoints power system efficiency.
Earth/ ground bonds e.g. lightning protection onstructures. Ground mats, ground conductor rings,metal cladding, metal ceilings, metal floors, hand rails, seats etc. tolimit step and touch potential.
Platformedge doors Earth / ground bonding (mainlyunderground systems)
Graphite electrodes to verifydensity
Shipbuilding or any metal structures
Weldquality measure at regular intervals along weld length looking foruniformity.
Installedequipment bonds to steel structure /hull.
Rawmaterial processing, e.g. cement plants
Powercarrying elements installation and maintenance
Ground bonds – cement is corrosive
Cable leads in robot spot welderswork-harden through flexing causingstrands to break. Results in poor weld quality.
Power Generation and Distribution
Bus bars lap joint tests tomaintain low resistance, and hencemaintaining efficiency and reducing likely hoodof fire.
Cablejoints including overhead lines. High impedance joint can explode.
UninterruptiblePower Supply (UPS)
Batterystraps quality of connections. Preventingpotential of fire and failure to operate
Carrier to plate weld resistance High resistance indicates poor weldquality that will restrict batterys ability to carry current.
Militaryvehicles Trucks, tanks etc.
Installedequipment such as radio equipment – ground bonding to vehicle chassis.
Buildings wiring, lightning protection bonds
Variousbond, both for power distribution and earthgrounding check for step and touch voltagesafety in fault condition.
Conduitcontinuity metal conduit, detect corrodedor loose threads etc.
Cathodicprotection check connection etc. Toughenviron
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