How to use the Visual Fault Locator Clean and inspect the connectors on the patch cord, if used, and the fiber to be tested. It's a cost-effective and straightforward tool, making it ideal for quick troubleshooting and maintenance. If you're new to fiber optics or just. Page 1 VisiFault Visual Fault Locator Instruction Sheet The VisiFault Visual Fault Locator (VFL) is a visible light source that helps you trace optical fibers, check fiber continuity, and find faults such as breaks, bad splices, and tight bends in fiber optic cable. Page 2 Using the Visual Fault. It has a laser diode with a wavelength of 635 nm (nominal) and is classified as Class 2. The VFL is compatible with for connectors with 2. However, fiber optic cables can develop faults due to a range of factors, such as improper installation.
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