Open source current probe based on Rogowski coil

This project is a Rogowski coil based current probe designed to measure high frequency AC current in small spaces. The sensing coil is optimized to be small enough to fit between the leads of a TO-220 transistor and can be slid around the leads of many through-hole power components for non-intrusive current measurements. The project consists of a Rogowski coil and an integrator/amplifier that conditions the signal from the Rogowski coil and provides an output voltage proportional to the current flowing in the conductor surrounded by the Rogowski coil. The sensing coil is open ended and the free end is held in place by a fixed O-ring. This allows the coil to be placed around the wire without breaking the circuit. The amplifier provides a 0.1V/A output via an SMA connector and is designed to drive a 1M oscilloscope input via coaxial cable. The amplifier is powered via a USB-B connector and consumes less than 2W. Typical Electrical Performance Bandwidth: 800 Hz - 25 MHz Sensitivity: 0.1 V/A Maximum Current: +/- 30 A Noise: 6mA RMS Slew Rate: 1 A/ns Coil OD: <1.7mm Length: 70mm Current probes meet The original design target is suitable for general laboratory use. Recently manufactured versions of the integrator have some issues with wireless signal (WiFi and LTE) interference. The PCB files in the latest submission have layout changes to accommodate the circuitry under the metal shield can, which should largely resolve the issue. Only minor electrical modifications have been made in the updated version, but they have not yet been tested.