Connect the fiber directly to the VFL port or use the patch cord to connect to the port. No setup, no calibration, no software -- just inject visible red light and walk the cable route. This guide covers the actual workflow: connecting safely, choosing continuous vs modulated mode, what different glow patterns mean, and the field. When it comes to testing fiber optic cables, a Visual Fault Locator (VFL) is an essential tool in your toolkit. A VFL is used to detect faults, breaks, or bends in fiber optic cables by emitting a bright red light that is visible even through the fiber's jacket. Using a VFL to diagnose issues can save time and cost when diagnosing an. Unscrew dust cap, press the power switch on the end of the cap to power up unit. Press mode switch again and the red beam will pulse (frequency 6-9 Hz).
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