Current Transformer for Oscilloscopes
Electric current can be measured in differing ways and processes. Frequently we make use of a shunt resistor, across which we can measure the voltage drop caused by current flow. Actually many oscilloscopes have a galvanic (electrical) connection between signal ground and the protective earth (ground) wire of the 230 VAC line supply and for this reason the shunt method is often inappropriate. Commercial current clamp devices certainly are able to measure current by potential-free means but they are not suitable for capturing rapid alterations in current over time. In addition many low-cost examples of these do not provide an output for connecting to an oscilloscope.