RMO200G High DC Current Resistance Meter

Micro Ohmmeters RMO-G series are designed to measure the resistance of circuit breaker contacts, busbar joints, contact elements in bus-bars and other high-current links. The products are lightweight, reliable, accurate and very competitive on the market. Using RMO-G series with Both Sides Grounded Unit as an option, it is possible to test the resistance of an object grounded on both sides during the test, giving a safer, faster and easier workflow. Remote Control Unit is an optional accessory. These products are mounted in plastic cases.

The RMO-G series instruments are designed for contact resistance measurement of non inductive test objects. RMO instruments are based on state of the art technology, using the most advanced switch mode technique available today. RMO generates true DC current with automatically regulated test ramps. During the test RMO ramps with increasing current before measuring and decreasing current after the measurement. This eliminates magnetic transients.

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

high, middle and low voltage circuit breakers high, middle and low voltage disconnecting switches high-current busbar joints cable splices welding joints

Contact resistance is a value that is specified as a reference for all kinds of circuit breakers. According to IEC 56 (now IEC62271-100) this resistance value should be measured using a test current between 50 A and the breakers nominal value. According to ANSI C 37.09 the lowest test current is 100 A. Other national and international standards specify similar regulations.

Accessories

Cables and clamps

IBEKO provides Current Cables with cross sections from 16 mm2 to 70 mm2 (16, 25, 35, 50 and 70 mm2), with lengths of 3, 5, 10 and 15 m. All our Current Cables can be delivered with the following types of clamps: Standard clamps, C clamps, isolated clamps, non-colored clamps and semi-isolated clamps. Sense Cables are 2,5 mm2 cross section with lengths of 3, 5, 10 and 15 m. Extension Cables are with cross sections from 16 mm2 to 70 mm2 and with lengths of 5 m and 10 m.

Remote Control Unit

The RMO Remote Control Unit is an optional control unit, for RMO-G series instruments, that is used to start and stop the tests from a remote location, away from the actual RMO. Very often the same test current is fed through the test object for a series of tests. To simplify this and speed up the process, multiple measurements can be carried out with the RMO Remote Control Unit.

Transport Bags, Transport Case

We offer transport bags (device bag and cable bag) as a standard accessories. Also, we offer hard transport case as an optional accessory which improves mechanical protection of devices in transport.

Both Sides Grounded Unit

Using Micro Ohmmeters RMO-G series with current clamp it is possible to make safer measurement of an HV circuit breaker resistance with both sides of the breaker grounded. It is performed automatically by measuring the current through the ground connection and reducing this value from the total current. This is an optional accessory.

Test shunt

IBEKO provides as optional test shunt 600 A/60 mV. It could be used for accuracy checking of our Micro Ohmmeters.

Built-in thermal printer

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

Calibration Set for Micro Ohmmeter Series RMO

With our Calibration Set for Micro Ohmmeters you can calibrate devices with USB and RS232 interface.

Standard accessories

Digital Multimeter DV Power Switch Box Test Shunts Voltage Sense cables RMOWin-CAL Software

We provide three Test Shunts and DV Power Switch Box, calibrated in SP National Testing and Research Institute, Borås, SWEDEN. Test shunts and Digital Multimeter are calibrated at manufacturers facilities.

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