Application #3: Port Identification
The VOLT can help take the guesswork out of
identifying ports in a fiber patch panel or checking
polarity of a duplex connector. Connect the
VOLT to one end of a fiber link, and the high-
intensity, precision-coupled red laser diode will
allow the user to visually identify the port by the
presence of a red glow emitting from the
connector on the other end. The VOLT allows for
visual port identification of fiber optic links up to 5
kilometers (3.1 miles) away!
VOLT (Visual Optical Length Tester)
Optical Length Testers
Fiber Optic
Test Equipment
Visual Optical Length Tester (VOLT) Description
The VOLT uses a visible laser that can measure fiber links of up to 1.5 kilometers, and is accurate to within ±2.5 meters. In addition
to length testing, the VOLT’s high-intensity laser permits it to do double duty as a visual fault locator, and a pulsing mode allows for
easy visual fiber identification.
Each unit comes with a protective rubber boot, carrying strap, 9-volt battery, NIST-traceable certificate of calibration, and CD-ROM
with operations manual.
For more information about OWL optical length testing technology, see page 14.
Specifications
Range
Accuracy
Resolution
Other Function
up to 1.5 km
± 2.5 m (7 feet)
0.001 km (1 meter)
Doubles as a Visual Fault Locator (VFL)
Ordering Info
395.00VOLT Visual Optical Length Tester (red laser)
Application #1: Fiber Length Measurement
The VOLT is designed to measure the length of optical
fiber links up to 1.5km, and is accurate to ±2.5 meters!
The VOLT uses a "round-robin" method of measuring
fiber length. This is accomplished by looping back two
fibers at one end of the fiber run. The round trip time
that the light takes to travel through the fibers is
converted to length in kilometers, then divided by two
to show the length of the fiber cable. There is no need
to measure the length of all the fibers; the length
measurement can be applied to all fibers in the cable.
The VOLT can also be used to verify the amount of fiber
on a spool prior to installation simply by connecting to
the ends of the spool and multiplying the displayed
fiber length by two.
Note: the VOLT is not an OTDR-like device. It does not measure distance to a fault. It is designed to measure the
total length of a fiber link based on a two-fiber loopback method.
Application #2: Visual Fault Location
The VOLT can also be used as a troubleshooting tool to determine if there are breaks, micro-bends, or any
other anomalies causing excessive loss within the first few feet of the fiber under test, located in the splice
tray. The laser diode in the VOLT injects high-intensity red laser light into the near-end connector. If this light
encounters any anomalies, such as a break or a micro-bend, the light is deflected into the fiber jacket,
producing a red glow at the point of the anomaly. Some optical fiber jackets are colored so that it is difficult to
see red light shining through, so it is recommended to keep the room light at a minimum when using the VOLT
for visual fault location.
Symbolic
Fiber
Link
Symbolic
Fiber
Link
(8 pages)
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