In this technical walkthrough, we explore the operational role of the Bently Nevada 3500/25 Enhanced Keyphasor Module within machinery protection systems. You'll see how this module processes signals from proximity probes and magnetic pickups to generate precise Keyphasor timing pulses, enabling accurate shaft speed and vibration phase measurements. We demonstrate its compatibility with legacy systems, TMR configurations, and explain when to use isolated vs. non-isolated I/O modules for optimal performance in industrial applications.