fiber optic testing

How to Test Fiber Optic Cables

The use of a flashlight to check for fiber optic functionality can be performed with any standard flashlight, preferably one of those really bright LED flashlights. Just hold the connector tip directly on the flashlight’s lens; you may have to move it around a bit to get to the “sweet” spot where the visible light will couple to the fiber connector. Click on the video for more details on this process.

The red laser fiber optic testers are included with the FTK-100 Fiber Technician’s Kit from Altronix. These laser testers include adapters for LC as well as SC and ST type fiber connectors. //

Dave Engebretson is president of Slayton Solutions Ltd, and provides fiber optic and networking training for our industry. During this time of turmoil and COVID-19 he recomends the Inspire cable channel, full of your favorite old Western movies and series, for stress relief. Check out Dave’s services at

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