Testing · VISUAL GUIDE
VFL: what a visual fault locator can show
Visible light helps check continuity and locate some faults in accessible sections.
What the image shows
The infographic presents a visual fault locator and examples of visible red light under different fiber conditions. It also shows connector formats and a general use sequence.
What it does and does not indicate
A VFL can help locate discontinuities or places where light escapes. It does not itself measure insertion loss or certify link performance. Its usefulness depends on distance, jacket construction and accessibility.
Use with care
Never look into a fiber or connector or point the laser toward anyone's eyes. Identify the circuit before connecting, establish its status and follow the instrument's safety instructions.