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MOM2 Microohmmeter with Kelvin Probes

Megger BD-59090

The Megger BD-59090 MOM2 Microhmmeter 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.



  • Up to 220 A
  • Battery powered
  • Lightweight – 1 kg
  • Safe test – DualGround
  • Auto range: 1 μΩ to 1000 mΩ
  • Bluetooth PC communication
  • Complies with IEEE and IEC standards
  • Easy to use – Attach the Kelvin Clamps and press TEST button
  • Active-duty and rugged design. All weather, all environment, all industry usage
  • Truly handheld
  • Testing with both sides grounded

The Megger BD-59090 MOM2 Microhmmeter 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.

The Megger BD59090 MOM2 Microhmmeter can be used anywhere to measure a low resistance value with high accuracy. 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. This gives a personal safe, quick and easy measurement.

The ruggedness and lightweight makes Megger BD-59090 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 190 test values and transfer test data to a PC via Bluetooth.

Low weight, ease of use and versatility has been key issues during product development. New patent pending technology has made MOM2 small and light, it weighs about 1 kg. Despite the small size and light weight the instrument can deliver a maximum current of about 220 A short duration and up to 100 A for three seconds.

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Application field For use in high-voltage substations and industrial environments.
Installation category CAT I
Relative humidity %RH 5%-95%, non condensing
Pollution degree 2
Shock IEC 60068-2-27
Vibration IEC 60068-2-6
EMC 2004/108/EC
LVD 2006/95/EC
Battery power Five AA (HR6) 2700 mAh NiMH cells
Recharge time < 12 h
Typical recharge time at 25°C 4 h
Audible feedback Different buzzer sounds
User presets 3
Field calibration  Yes
Encapsulation IP54
Measurement section
Minimum current guarantee Selectable 50 A / 100 A 
Valid at resistance ≤2mΩ
Pass / Fail Settable from 1 µΩ to 1999 mΩ
Number of measurements on fully charged batteries typ. 2200 at I min = 50 A 
typ. 800 at I min = 100 A
Interference suppression Yes
Range 0 - 1000 mΩ
Resolution 0 – 999 µ : Ω1 µΩ
1.0 – 9.99 mΩ : 0.01 mΩ
10.0 – 99.9 mΩ : 0.1 mΩ
100 – 1000 mΩ : 1 mΩ
Inaccuracy 0 – 1999 µΩ : ±1 % of reading ±1 digit
2 – 1000 mΩ : ±2 % of reading ±1 digit
Range > 100 A DC (R < 2 mΩ)
Output voltage (max) 2.5 V DC
Generation duration Selectable: 0.1 s, 0.6 s, 3 s
Connector 4 mm banana jack
Voltage ±3 V DC
Trigger input Threshold 8 V DC
DC IN 12 – 24 V DC, 2 A max 
Logger, Data Label. Timestamp, I max, I min, I Limit, Resistance, Meas.time, P/F limit
Labeling schemes Circuit breaker oriented or diary number
Capacity 190 measurements
Wireless communication
Headset Bluetooth
PC communication Bluetooth

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