VFL-VISITESTER OPERATION
KI23400/KI27400 UM-2
-
46 -
VFL-VisiTester Operation
VFL-VisiTester is an option, depending on the instrument p/n.
The VFL laser shares the Two-Way port, so it can be used in a few
ways, for example:
1.
If the instrument (source) is in Autotest mode, the red VFL laser
is intermittently mixed in with the test signal. So, at the far end,
on shorter distance tests, the fiber to be tested will flash red
occasionally. This can save a lot of time finding a misplaced fiber
to be tested and is very helpful to get the testing under way in the
first place.
2.
The VFL laser can be used as a typical full-feature VFL, eg for
typical fault location or continuity testing
3.
The VFL is high powered for the longest possible range and is
the maximum power level for an eye-safe Class 1 device.
The visible laser works equally well in single mode and multimode
systems. Although red light is usually visible at the fiber end for up to
about 10 Km, best performance is achieved over distances of less
than 1km.
Operation:
If used with Autotest, no specific action is needed other than to start
Autotest. In Autotest mode, the red laser is not included in the
displayed test result.
If used in stand-alone VFL mode: To switch on the visible laser, press
[On] then [SOURCE], then select the 650 nm VFL
λ
.
To improve visibility, the laser is modulated at 2Hz. To change
modulation frequency or turn off modulation, press and release [Mode]
repeatedly while source is on.
The visibility of the red light can be greatly improved by darkening the
area to be observed. For example, a heavy blanket over both the
observer and the fiber, can be happily used to block out sunlight.
Long Distance Fault Finding
For long distance fault finding, the non-VFL light source tone function
can be used with a clip-on fiber identifier or power meter to give up to
200Km of fault-finding range.
WARNING!
Although the visible laser is classified as Class 1, and so
is eye safe, please observe any other required optical safety measures
for the system under test.
