Protective Bonding Tester DV Power RMO100E

A typical application of the protective bonding tester is the continuity test of the protective bonding conductors to verify that all conductive parts that are exposed to user contacts are properly connected to the ground. The test set complies with IEC 61010-1 safety standard. The protective conductor ensures that in the event of a failure, no dangerous voltage is present on the equipment's housing. In such a case, a life-threatening current could flow through the user if the housing were touched. This could happen if the resistance of the protective conductor is too high. The protective conductor should therefore reduce or in the best case eliminate the danger to persons. Therefore, all internal and external protective conductor connections must be checked for perfect performance.  
This device could also be used for contact resistances measurement of non-inductive test objects used in the electric power industry or similar branches, such as:

• High and medium voltage circuit breakers  
• High and medium voltage disconnecting switches  
• High-current bus bar joints  
• Cable splices  
• Welding joints  
• Fuses  

Protective Bonding Tester Test Mode 

The RMO-E tester is supplied with two different modes, SINGLE and CONTIN. Under SINGLE mode, only the test current can be selected, and under CONTIN mode, the test duration can also be selected (up to 300 seconds). This micro-ohmmeter is a precise measuring tool that generates a true DC ripple-free current with automatically regulated test ramps. During a test, the protective bonding tester ramps with increasing current before measuring and decreasing current after the measurement. This significantly decreases magnetic transients and ensures great accuracy. The pass/fail criteria is another feature that can be activated and gives the alarm if the measured resistance value is higher than the set Rmax value.

RMO-E Micro-Ohmmeter Design  

The RMO-E is a reliable test device that can store up to 500 measurements in internal memory. A built-in thermal printer is available as an option. Free DV-Win software is included in the purchasing price and communicates with the micro-ohmmeter via USB or RS232 interface. It allows you to run the test remotely from a PC, download test results, analyze them, and generate fully configurable test reports. A high output voltage enables the measurement of a wide resistance range and the use of long and thinner test cables, which is a benefit. As a digital micro-ohmmeter, is the ideal choice for industries that require precise and consistent measurement of electrical resistance.

Connecting Protective Bonding Tester to a Test Object  

The connection principle of the RMO-E tester corresponds to Kelvin’s (four-point) measurement principle. The measuring cables from the "Voltage Sense" terminals are attached as close as possible to the test object, and in between the current feeding cables. That way, the resistance of current cables and clamps is excluded from the resistance measurement.