EQUIPOTENTIAL BONDING AND CONNECTIVITY TESTING MI 3252 MicroOhm 100A


The equipotential bonding and connectivity of bigger cross section conductors, parallel connected bars and metal stripes is hard to prove without a powerful, accurate and precise measuring system. The MI 3252 MicroOhm 100A is just what is needed to show reliable and stable results in fine resolution of 1 nanoOhm.


The MI 3252 MicroOhm 100A is portable low resistance ohmmeter used to measure low contact resistance of circuit breakers, switches and busbar joints using test current from 100 mA up to 100 A. A 4-lead Kelvin test method is utilized to eliminate test lead resistance and provide extremely ac- curate readings (0.25%). The instrument can be powered from mains supply or internal battery. PC SW HVLink PRO supplied as a standard accessory enables downloading, analysis and export of test results and printing of test reports.


MEASURING FUNCTIONS: • Resistance measurement with adjustable test current (100 mA … 100 A);


• Voltage drop measurement.


APPLICATION: Resistance measurement of: • High, middle and low voltage circuit breakers; • High, middle and low voltage disconnecting switches; • High current busbar joints; • Cable splices; • Welding joints.


TESTING OF LARGE EARTHING SYSTEMS MI 3295 Step Contact Voltage Measuring System


The measurement of earth resistance, soil resistivity and the analysis of voltage drop around objects such as earthing systems, antenna towers, HV towers, industrial platforms, transformers, generators, PV systems etc. is necessary to ensure the safety in the surrounding area should the object become dangerous in the event of a earthing fault or lightning strike.


The MI 3295 Step/Contact Voltage Measuring System is one of the smallest all in one solutions, with a powerful generator (up to 55 A) and special technology to eliminate the earth noise current (even in low power operating mode (in the range of mA)). The MI 3295 Step Contact Voltage Measuring System is extremely safe and utilizes a SELV voltage of only 55 V to perform its tests, reducing the risk of injury to people or livestock when performing tests in public or in areas containing livestock. All test results can be interpreted and recalculated online at the test site to simulate a live to earth fault or lightning strike.


The MI 3295 Step Contact Voltage Measuring System is a voltage meas- uring system intended for testing and verification of protective earthing of power stations, substation and other power systems. The system consists of a station for generating current and an autonomous voltage Meter (removing the need for long test leads). Due to high test current (up to 55 A) and effective noise cancellation, the MI 3295 produces very accurate and stable measurements of Step and Contact Voltages with the resolution down to 10 µV. Multiple voltme- ters can be used simultaneously for faster analysis of voltage distribution around the tested object. All test results and parameters can be saved into the instrument’s memory for further reference, downloading, analy- sis and test report printing with the help of the PC SW HVLink PRO.


MEASURING FUNCTIONS: • Step voltage; • Contact voltage; • Earth resistance.


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APPLICATION: Measurement of protective earthing of: • Power stations; • Substations; • Distribution towers; • Other power systems.


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