Learn about fiber pen tester (Visual Fault Locator) in a few minutes

What is a fiber pen tester?

  The fiber pen tester (also called VFL: Visual Fault Locator) is a tool to identify fibers from end to end and locate polished connector endfaces easily. A red laser shines through most yellow-jacketed fibers to help you pinpoint breaks, bends, faulty connectors, splices and other causes of signal loss.

10mw visual fault locator

10mw visual fault locator

Where to use this tool?

  The pen tester tool is specially designed for field personnel who need an efficient and economical tool for fiber tracing, fiber routing and continuity checking in an optical network during and after installation. It includes: finding the breakpoint, poor connections, bending or cracking in fiber optic cables, finding the faults of OTDR.

  These handy locators have up to 10km~30km distance range (depands on the light power)and a wavelength with excellent visibility and the highest attenuation.

How they works?

  They locate faults visually by creating a bright red glow at the exact location of the fault on singlemode or multimode fibers.
  Due to their small size, light weight and simple but proven design, the visual fault locator can accompany you anywhere even to the most demanding environments.
  To ensure ruggedness, they usually have rubber seals, fully enclosed laser head and long-lasting on/off switch. Their extremely high efficiency guarantees prolonged battery operation for long time uninterrupted.

Common fiber optic test applications (usually together with optical power meter)

  • Measuring the absolute power in a fiber optic signal. For this application, the power meter needs to be properly calibrated at the wavelength being tested, and set to this wavelength.
  • Measuring the optical loss in a fiber, in combination with a suitable stable light source. Since this is a relative test, accurate calibration is not a particular requirement, unless two or more meters are being used due to distance issues. If a more complex two-way loss test is performed, then power meter calibration can be ignored, even when two meters are used.
  • Some instruments are equipped for optical test tone detection, to assist in quick cable continuity testing. Standard test tones are usually 270 Hz, 1 kHz, 2 kHz. Some units can also determine one of 12 tones, for ribbon fiber continuity testing.

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