Visible fault location (VFL)
Use visible light to find where loss is occurring in an optical cable.
- Pen sized VFL fault locater & line tracer
- Single mode, multimode and plastic fiber applications
- Eye safe Class 1 device, no safety procedures required
- Rugged & simple fibre optic fault finder
- 2.5 & 1.25 mm universal connector options
- Pulsed or continuous laser options
- Useful in combination with an OTDR, to help exactly identify a fault
- High throughput premium meter with expert features and simple interface.
- Autotest, with up to 3 λ display
- Powerful KITS™ standards compliant reporting software
- Reliable, high-accuracy results
- Rugged, slim, rubberized case
- Large memory with text, timestamp, USB key storage
- 1,000 hr AA battery life (or external power)
- Sunlight-reflective high contrast backlit multi-line display
- Detector options for all network & connector types
Related Fault Finders & Continuity Testers
- Easy to use fiber checker
- Live fiber detector or tone detectors
- Easy to use fiber finder
- Supplied with interchangeable heads for most fiber/cable types
- Low false detection rate
- Uses popular 9 volt battery size. Auto turn-off
- Power display is very useful for finding lossy components
- Identifiers require a light source with tone facility, preferably 1550 nm
The useful operating range of fiber optic visual fault locators is widely misquoted, with ranges of 20, 30, 40 and even 50 Km often incorrectly stated.
This is what they will actually do. There is no magic, it's just a combination of emitted power, attenuation and eye sensitivity, combined with eye safety limits on emitted power when no connector is attached (which is often not quoted at all).
If you are struggling here, consider a different technology that's safe to use.
|VFL range under ideal conditions||Power level connected||Power level disconnected||Wavelength||"Connector end view" continuity||"Break location" in patch lead||"Side glow" continuity||Comment|
|KI6354 Pen||-4.5 dBm||- 1.5 dBm typ||650 nm||8.75 Km||5.75 Km||3.75 Km||Small & easy|
|KI9807||-2 dBm||-2 dBm||635 nm1||8.75 Km||5.75 Km||3.75 Km||Brighter on short distances|
|KI2600 Power meter||+2 dBm||+2 dBm||650 nm||9.8 Km||6.8 Km||4.8 Km||Top performance|
|KI2000 Series VisiTest||+2 dBm||+2 dBm||650 nm||9.8 Km||6.8 Km||4.8 Km||Top performance|
|Class 1 Legal Limit||+3 dBm||+3 dBm||10 Km||7 Km||5 Km||No precautions needed|
|KI9808||+7 dBm||+7 dBm||650 nm||10.7 Km||7.7 Km||5.7 Km||Requires special site precautions|
|Class 2M Legal Limit||+10 dBm||+10 dBm||11.2 Km||8.2 Km||6.2 Km||Maximum legal power level allowed|
|Illegal VFL "20Km"||+20 mW / 13 dBm||Not specified!||650 nm||11.7 Km||8.7 Km||6.7 Km||Illegal|
|Illegal VFL "30Km"||+30 mW / 14.8 dBm||Not specified!||650 nm||12 Km||9 Km||7 Km||Illegal|
|Illegal VFL "40Km"||+40 mW / 16 dBm||Not specified!||650 nm||12.2 Km||9.2 Km||7.2 Km||Illegal|
|Illegal VFL "50Km"||+50 mW / +17 dBm||Not specified!||650 nm||12.4 Km||9.4 Km||7.4 Km||Illegal|
|Source & Clip on Identifier||0 dBm||0 dBm||1550 nm||200 Km||200 Km||200 Km||Good long range solution!|
Note 1: Attenuation is higher at 635 nm than at 650 nm. In addition to the photopic curve effect, this makes faults look brighter.
These calculations are approximate and variations may be observed in practice, depending on the fiber type, fiber & cable pigments, cable construction, ambient lighting, operator skill etc.