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Winding Ohmmeters

High current winding ohmmeter for transformers/motors

The winding ohmmeter series RMO-T instruments are designed for winding resistance measurement of inductive test objects. RMO-T winding ohmmeter are based on state of the art technology, using the most advanced switch mode techique available today. RMO-T winding ohmmeters generate true DC current (up to 50A @ 60V) with automatically regulated measurement and discharge circuit.

Typical application areas of RMO-T winding ohmmeter are high-voltage substations and industrial environments. An important part of commissioning, maintaining and production is measuring winding resistance of:

• transformers
• generators
• electrical motors
• high-current busbar joints
• cable splices
• welding joints

	RMO10T	RMO20T	RMO30T	RMO40T	RMO50T
CURRENT RANGE	5mA - 10A	5mA - 20A	5mA - 30A	5mA - 40A	5mA - 50A
RESISTANCE RANGE	0,1µΩ-2000Ω	0,1µΩ-2000Ω	0,1µΩ-2000Ω	0,1µΩ-2000Ω	0,1µΩ-2000Ω
RESOLUTION	0,1µΩ	0,1µΩ	0,1µΩ	0,1µΩ	0,1µΩ
ACCURACY	0,2%	0,2%	0,2%	0,2%	0,2%
PC SOFTWARE	YES	YES	YES	YES	YES
TAP CHANGER	YES	YES	YES	YES	YES
BUILT-IN THERMAL PRINTER	OPTIONAL	OPTIONAL	OPTIONAL	OPTIONAL	OPTIONAL

Accessories

Cables and clamps

We offer Current Cables with cross sections of 2,5mm2 and 10mm2, with lengths of 10m and 15m. All our Current Cables are delivered with isolated clamps as a standard. Sense Cables are 2,5mm2 with lengths of 10m and 15m. Current connection cables are 5m long, with cross sections of 6mm2 or 10mm2.

[Voltage sense cables]	[Current cables]	[Current connection cable]

Transport case

Hard transport case is standard accessory which improves mechanical protection of winding ohmmeters in transport from IP43 to IP54.

Cable bag

As an optional accessory we offer a cable bag.

Test shunt

We offer two types of test shunts: 50A/100mV and 100A/100mV. They could be used for accuracy checking of our Winding Ohmmeters.

Built-in thermal printer

We deliver devices with 80mm paper wide built-in thermal printer, as an optional accessory.