EMC Question of the Week: July 6, 2026

A current waveform (square wave) and 4 possible measured waveforms

A small loop magnetic-field probe is placed on a circuit board trace. The trace carries a current with a waveform that looks like a 60-mA, 250-MHz square wave. The magnetic-field probe's loop inductance is 15 nH. When connected to a 50-Ω oscilloscope input, we measure a voltage waveform that looks like 

  1. the current waveform
  2. the current waveform with no DC component
  3. pulses corresponding to positive and negative transitions
  4. a 250-MHz sine wave

Reveal Question of the Week - Answer 260706