Current Sensing

In almost every physical phenomenon that can be defined by electrical parameters, there is more intelligence in current than in voltage measurements. Lacking technology in non-contact current sensing, historical developments have resulted in instruments and accessories for current measurement that require insertion in the circuit and are often difficult, dangerous and circuit-degrading in their application. Because of these drawbacks, less desirable voltage-drop circuit analysis has become widespread. Advantages and disadvantages of present technology are investigated and compared to recent developments in current sensing, utilizing Hall-effect devices which offer safe, accurate, reliable and non-contacting measurement of ac, dc and composite currents.