Operating Instructions 5-7 M90 Fusion Splicer
Issue 02/97 Attenuation Splice
Possible prob-
lems
If the set attenuation is not obtained or the result is not sufficiently accurate, ensure first
that all parameters except the fusion current are set to provide good splice attenuation
results in the
Automatic Fusion Time
program. If this is the case, proceed as set out
in the following check list. Keep to the specified sequence and check the effect of each
change before proceeding with other changes.
Fault Symptom/
Possible Cause
Remedy
Attenuation too low.
The fusion pulses
are
not
generated.
The electrodes are not in-
serted as far as they can go
into the electrode holder or
they are very dirty.
Check and correct if necessary. The
electrodes must be clean and inserted as
far as they can go.
The fusion current is set too
high.
Ensure that the fusion parameters rec-
ommended for the given fiber type have
been set. The fusion current is to be set
0.5 mA lower than for normal splices.
Check the duration of the first fusion
phase. The fusion current must be set so
that it is applied for between 2 and 5 s.
The lead is too low
. If the lead recommended for the given
fiber type is set, increase this value in
steps of 5 %.
Attenuation too low.
The fusion pulses
are generated.
The actual value displayed
changes with each fusion
pulse by a high percentage.
The fusion pulses are too
long.
Reduce additional time in steps of 0.02 s.
Attenuation value
too high.
The process is
aborted after 20
fusion pulses.
The actual value displayed
changes only slightly from
one fusion pulse to the next.
The fusion current is set too
low.
Check the duration of the first fusion
phase. The fusion current must be set so
that it is applied for between 2 and 5 s. If
this is already the case, the cause may lie
in the additional time being too low (see
below).
After the first fusion phase,
the actual value is very much
smaller than the required
value. The actual value rises
markedly from one fusion
pulse to the next but does not
reach the required value.
The lead is too large.
Reduce the lead in steps of 5 %. If the
attenuation is then too low and no more
fusion pulses are generated, set the old
lead value again and increase the addi-
tional time in steps of 0.02 s.
The displayed actual value
changes only slightly from
one fusion pulse to the next
or falls.
The additional time is too
short.
Increase the additional time in steps of
0.02 s. If the attenuation falls below the
required value by an excessive amount,
the additional time was probably not too
short but rather the lead was too large.
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