Micro-ohmmeter | MOM2
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MOM2Micro-ohmmeter ■ Up to 220 A ■ Battery supplied ■ Lightweight - 1 kg ■ Safe test - DualGround™ ■ Auto range: 1 pQ to 1000 mfl ■ Bluetooth® PC communication ■ Complies with IEEE and IEC standards DESCRIPTION The MOM2 is designed to measure the resistance of circuit breaker contacts, bus-bar joints and other high-current links. This product is designed with safety, ease of use and versatility in mind. The micro-ohmmeter can be used anywhere to measure a low resistance value with high accuracy. MOM2 uses an ultra capacitor to generate the high output current. The ultra capacitor is able to store a huge amount of energy compared to conventional capacitors and can deliver very high current during the discharge thanks to its very low internal resistance. While testing, the capacitor is discharged through the test object and the voltage drop across- and the current flow through the test object are continuously and synchronously sampled. The resistances calculated from the individual samples are then averaged to obtain the final value. With MOM2 it is possible to make measurements according to the DualGround™ method. This means that the test object will be grounded on both sides throughout the test giving a safer, faster and easier workflow. The ruggedness and lightweight makes MOM2 a handheld instrument very suitable for field work, such as in substations. The unit comes with a strong rubber holster accessory which makes it extra durable. MOM2 is dimensioned to make a full day's work of testing without recharge. It can store 104 test values and transfer test data to a PC via Bluetooth. APPLICATIONS 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 low resistance is at high currents: At 10 kA a contact with the resistance 0.1 mO 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.

1. Current output terminal (-) 2. Current output terminal (+) 3. Display The display offers a combination of analogue arc and a dual digital readout: ▪▪Analogue arc: Indicates level of the capacitor charge. ▪▪Dual digital display: Large main digital readout for good visibility of all main measurement results Second digital display for additional data. 4. Ground (earth) terminal 5. Keys for navigation and to make settings in the display Measurement time with max. charge Bluetooth “pair units” Set date and time Set volume for the internal loudspeaker 6. TEST-button 7. Stand-by/Wake up (Press...

APPLICATION EXAMPLESBOTH SIDES GROUNDED Conventional vs. DualGround Circuit Breaker testing ■ Test of circuit breaker contacts ■ Test of the connections to the breaker Testing of Bus-bar ■ Test of Bus-bar joints ■ Test of connections Everywhere you need to test a low resistance/ high current connection ■ Switches ■ Disconnecting devices ■ Safety ground connections ■ Welding points ■ Fuses ■ Cables Many utilities require safety grounds to remain in place during station outages, therefore, the MOM2 was designed with this field safety constraint in mind. DualGround means that the test...

4 WIRE KELVIN TEST The "double" probe tip showing the springy center tip. The Kelvin probes (incl. in BD-59090) are used for a 4 wire Kelvin test. This is a way of measuring continuity resistances ensuring all contact and lead resistances are compensated for, which allows a much greater accuracy in measurements. Each Kelvin probe assembly has two probe tips. One tip is for the current generated and the other will measure the very small voltage present. The Kelvin clamps (incl. in BD-59092) uses the same principle. MOM2 (BD-59092) with Transport case, Charger, Kelvin clamps, Rubber holster,...

MOM2 Micro-ohmmeter SPECIFICATIONS Specifications are valid at fully charged batteries and an ambient temperature of +25°C, (77°F). Specifications are subject to change without notice. Environment Application field Temperature Operation Storage Relative humidity %RH Pollution degree Shock Vibration Transport *) Battery operation temperature 0°C to +50° (32°F to +122°F) Battery charging temperature +10°C to +40° (50°F to +104°F) CE-marking EMC LVD General Battery power Recharge time Typical recharge time at 25°C Battery charger Mains voltage Power consumption Protection Real time clock...

ACCESSORIES ORDERING INFORMATION MOM2_DS_en_V13a ZI-BD03E ■ Doc. BD0336ME ■ 2018 Subject to change without notice Megger Sweden AB Registered to ISO 9001 and 14001 The word 'Megger' is a registered trademark www.megger.com