M90 Fusion Splicer 5-4 Operating Instructions
Attenuation Splice Issue 02/97
Fusion
sequence
The first fusion phase takes the same form as in the other programs. Up to 20 fusion
pulses are then generated at intervals of approx. 1 s until the required attenuation is
reached.
Level display
After the first fusion phase and after each fusion pulse, the current LID level and the
target value are displayed as relative level values. This display serves solely as an aid
to parameter optimization. Further information can be found in section "Possible Prob-
lems". The displayed levels are unimportant for normal operation.
Attenuation
display
After fusion has been completed, the attenuation obtained is measured and displayed.
If this value deviates from the required value by more than the amount given in the
"Technical Specifications", refer to the notes lower down in this section.
Splice protec-
tion
Remove the fibers and fit the splice protection. Refer to the section "Splice Protection".
Attenuation
too low
If the attenuation is already below the required value after the first fusion phase, no
fusion pulses will be generated and the value reached is displayed. Correct the parame-
ters as described in section "Possible Problems". The same applies if the fusion pulses
are generated but the attenuation reached is still too low.
Attenuation too
high, repeat fu-
sion
If the attenuation is still significantly over the required value after 20 fusion pulses, the
procedure is terminated and a question mark appears after the displayed levels. The
displayed attenuation is higher than the required value. You can then attempt to im-
prove the result by fuse again. This is particularly likely to be successful if the displayed
actual value has risen significantly after each fusion pulse and the attenuation differs
only slightly from the required value.
To perform fuse again, press buttons
and in succession.
Up to 20 new fusion pulses are then generated. If you are still unable to obtain the re-
quired attenuation or if you have to perform repeat fusion frequently, this is a sign that
the parameters need to be corrected as described in section "Possible Problems".
Splice Protection
Standard crimping and heat-shrink splice protectors are of only limited suitability for
protecting attenuation splices since they can impair the temperature stability of the at-
tenuation splice. Depending on the requirements on the attenuation temperature stabil-
ity, heat-shrink splice protectors must be used which employ a stabilizing support made
of glass.
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