S IMPLIFIBER ENGLISH - 22
requires the reference value to compensate for
the signal loss in the launch cable. This value
is then automatically subtracted from the
actual measured value to determine cable
plant loss.
Note
The launch cable used to set the reference
value should be the same type as the cables to
be tested: 50/125, 62.5/125, or single-mode.
IMPORTANT
All connectors and fiber end faces
should be cleaned prior to testing.
The Reference Methods
There are three recognized methods for
reference determination. Reference diagrams
will show how to establish a reference for
each method.
It is very important that the connections are
not disturbed after the reference value is
established. To assure that the effects of the
connectors and launch cables are zeroed
out, follow the instructions closely.
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