Potential-free current measurement probe for oscilloscopes
Measuring current with an oscilloscope is difficult because the common of the oscilloscope’s input is internally connected to the protective earth of the mains voltage. Current clamps can measure the current without potential, but are slow and usually do not have an output to connect to an oscilloscope. Current clamps for oscilloscopes exist, of course, but are expensive. The circuit presented here shows that a potential-free current measurement can be realized with relatively few but high-quality components.