Shanghai FO-LINK Technology Co., Ltd

Favorite  |  Set Home
Products > Fiber Testing Equipment > Visual Fault Locator > F-650 Visual Fault Locator (VFL)
Product name : F-650 Visual Fault Locator (VFL)
Item : FO-047
Price : $58.00-$78.00
Manufacturer : FO-LINK
Weight : 80.0g (without battery)
Size : 23.0mm x 190mm
 Enlarge Image                   Back
←[Previous Product]             

F-650 Visual Fault Locator (VFL)
This type VFL is specially designed for field personnel who need an efficient and economical tool for fiber tracing, fiber routing and continuity checking in optical networks. It finds breakpoints, poor connections, bending or cracking in fiber optic cables; and it can find faults in an OTDR dead zone and is used for end-to-end visual fiber identification.
1. Maintenance in telecom, CATV 
2. Test Lab of optical fibers 
3. Fiber routing and continuity checking in optical networks 
4. Other fiber optic measurements 
1. 2.5mm universal connector,for 1.25mm connectors,
2. FC(male)-LC(Female) adaptor also can be provided on request
3. Operates either in CW or Pulsed mode with constant output power
4. Low battery warning
5. Long battery life (up to 60 hours)
6. Drop-resistant and dust-proof design of laser head
7. Laser case ground design prevents ESD damage
8. Portable and rugged
9. Easy to use
Product Description
The Visual Fault Locator launches 650nm visible laser light into the fiber.When the light encounters a break or sharp bend, it scatters, and the scattered light can be observed emerging from the cable. The Visual Fault Locator can locates breaks in short patch cords, which an OTDR cannot detect due to their operating dead zone. A fault locator is also much cheaper than an OTDR. However, they are not recommended for using with dark-colored or armored cables.
The Visual Fault Locator can be operated in either continuous wave mode (CW mode) or in pulsed mode. Pulsed mode aids in locating faults under high ambient light conditions and improve battery life. It also could be used in checking connector quality. Often a connector may appears to be perfect. But inside the connector ferrule itself, poor gluing or dirty may create a micro bend in the fiber. This micro bend will produce excess insertion losses or return losses, and may result in premature failure of the connector. As the visual light launches through the fiber, it emerges from the connector in question, one can readily see the distortion as a series of rings superimposed on a normal output. Bending or  twisting the fiber may affect the overall intensity pattern, but not the ring pattern itself.



Central wavelength

650nm±10nm (635nm is available on request)

Emitter type

FP-LD (珀罗激光二极管)

Output power





Laser Range





Optical connector

2.5mm universal connector, for 1.25mm connectors, FC (Male)-LC. (Female) connector can be provided on request

Operating mode

Both CW and Pulse available 

Pulse frequency

2Hz to 3Hz / 9Hz

Power supply

2AA alkaline batteries 

Operating temperature

-20°C to 60°C 

Storage temperature

-40°C to 85°C 


23 x 190mm


80g (without battery)

Standard Package




Main unit, User Manual,Individual packing

For further reports, please contact us by Mail : or

Related Products :
F-660 Visual Fault Locator
F-660 Visual Fault Locator

Price: $60.00-$80.00
F-670 Visual Fault Locator
F-670 Visual Fault Locator

Price: $55.00-$76.00