Fluke OF-500 OptiFiber, Technical Reference Handbook

Page: 269 / 282

Loss Test Methods
The Alternate Method
B
B-11
The Alternate Method
Like Method B/A.1, the alternate method described in
this section produces results that account for the loss of
two connections plus the fiber in the link.
Like modified Method B, this method lets you test links
when you cannot change the tester's or source's input
adapter to match the connectors in the link. For
referencing, use the connections shown at the top of
Figure B-6. For testing, add the appropriate short patch
cords at each end. Figure B-7 shows an example of these
test connections for a link with MT-RJ connectors at both
ends.
You may also use this method to test links that have
different connector styles at each end, as shown in Figure
B-6. The link shown has MT-RJ connectors at one end,
and LC connectors at the other end.
Using an SC to MT-RJ patch cord and an SC to LC patch
cord for reference and test connections may seem like an
easier way to connect to the link; however, that would
require an MT-RJ to LC patch cord for reference
connections. The reference and test connections would
be the Method C/A.3 configuration, as shown in Figure
B-3. The loss results would account for the loss of only
the fiber in the link.
To account for the loss of both connections in the link,
you must add connections to each end after referencing,
as shown at the bottom of Figure B-6. Each fiber path
then has four connections. Since two connections were
canceled out during referencing, the test results include
the loss of the two connections at the ends of the link.
On the tester select Method B as the TEST METHOD
when using these alternate connections.