Magnetic-Electric Probes Posted July 18, 2018← Return to EMC Precompliance with a Real Time Spectrum Analyzer Part 3 — Affordable EMC Precompliance Testing Options‹›Fig 6 – BNC connectors are used in many DIY test equipment applications below 2 GHz, as BNC connectors are low-cost, easily modified, and robust enough for non-expert hand fabrication.