Octal-input Zero-span-mode Analyzer using FPGA boards

Measuring leakage currents in the rolling stock is crucial to avoid electromagnetic interference (EMI). Particularly, tackling common-mode current paths at a given signal frequency at several locations simultaneously is essential because railway signaling equipment uses electromagnetic waves below 10 MHz to detect trains and for vehicle-to-ground communications. This paper presents a measurement instrument that can simultaneously record eight inputs in zero-span mode using two low-cost field-programmable gate array boards.