Measurement of Equipotential Bonding without interruption!
From the perspective of automation technology, the function of equipotential bonding is not questioned because the functionality is assumed, and the contact points are mostly seen in the low voltage system. However, a secure and solid working communication network, including the bus system, is related with the function of the equipotential bonding. Straying currents and higher frequency currents often caused by frequency converters often use the screen of our data cable as the return current instead of the intended equipotential bonding system.
Relying only on gut feeling or making intuitive judgments about the quality of existing shielding and grounding measurements is rarely a good idea. The only way to ensure good equipotential bonding is proof by measurement. The resistance measuring clamp EMCheck® MWMZ II is the right tool for this purpose. In this way, you meet the requirements of DIN EN 50310, which are cited in the new guideline "Functional potential equalization and shielding of PROFIBUS and PROFINET" - from the World Association PROFIBUS & PROFINET International (PI).
How it works: EMCheck® MWMZ II consists of two coils. The first coil induces a voltage of a defined level and with a defined frequency of 2083 Hz. The second coil measures the current induced by coil one in the set frequency range. The ratio of these two values is used to determine and display the alternating current resistance (impedance). The measurement is made without any interruption and can also be carried on conductors which already carry currents during their normal operation.
