The Motor & Generator Winding Ohmmeter instruments are designed to measure winding resistance of electrical motors and generators. Based on the state of the art technology, using the most advanced switch mode technology available today, RMO-M series instruments are: accurate (0,1%), powerful (up to 100 A) and lightweight (8,0 kg / 17.6 lbs). Instruments generate a true DC ripple free current with automatically regulated measurement and discharging circuit.
RMO-M series instruments can perform a simple, quick, and reliable DC resistance measurement of all types of rotating machine windings. Problems such as a turn-to-turn short circuit in a winding, which reduces a motor / generator's ability to produce a balanced magnetic field, and a phase-to-phase short circuit, which in most cases results in a motor / generator trip, can be easily detected with these instruments. Additionally, any anomalies of the power circuit occurring downstream of the test lead connections will be identified by a resistance imbalance.
Test currents: 5 mA – 100 A
Lightweight: 8,0 kg / 17.6 lbs
Measurement range: 0,1 µΩ - 1 kΩ
Accuracy: 0,1 %
Resolution: up to 0,1 µΩ
Two resistance measurement channels
Automatic discharge circuit
Winding Resistance Measurement
Test currents: 5 mA – (50 A)100 A DC
Measurement range: 0,1 μΩ - 1 kΩ
Typical accuracy: ± (0,1% rdg + 0,1% F.S.)
Resolution
0,1 μΩ – 999,9 μΩ: 0,1 μΩ
1,000 mΩ – 9,999 mΩ: 1 μΩ
10,00 mΩ – 99,99 mΩ: 10 μΩ
100,0 mΩ – 999,9 mΩ: 0,1 mΩ
1,000 Ω – 9,999 Ω: 1 mΩ
10,00 Ω - 99,99 Ω: 10 mΩ
100,0 Ω – 999,9 Ω: 0,1 Ω
Data Storage
1 000 internal memory positions
Printer (optional)
Thermal printer
Graphic and numeric printout
Paper width 80 mm
Computer Interface
USB
Optional: RS232
Dimensions and Weight
Dimensions (W x H x D): 198 mm x 255 mm x 380 mm (7.8 in x 10.0 in x 15.0 in)
Weight: 8,0 kg / 17.6 lbs
Warranty: Three years
Environmental Conditions
Operating temperature: - 10 ºC to + 55 ºC / +14 F to + 131 ºF
Storage & transportation: - 40 ºC to + 70 ºC / - 40 F to + 158 ºF
Humidity 5 % - 95 % relative humidity, non condensing
Mains Power Supply
Connection according to IEC/EN60320-1; UL498, CSA 22.2
Mains supply: 90 V – 264 V AC
Frequency: 50 / 60 Hz
Input power: (600 VA) 1 200 VA
Fuse 15 A / 250 V, type F, not user replaceable
Applicable Standards
Low Voltage Directive:
Directive 2014/35/EU (CE conform)
Applicable standards, for a class I instrument, pollution degree2,
Installation category II: IEC EN 61010-1
Electromagnetic Compatibility :
Directive 2014/30/EU (CE Conform)
Applicable standard EN 61326-1:
