1569
‐
PT060EE1
Rev.
7
Page
10
of
62
2.2.4 Signal
filtering
The
instrument
allows
introducing
filtering
methods
of
the
signal
coming
from
load
cells
(FIR
filters).
This
method
is
based
on
Digital
Signal
Processing
(DSP)
modes
and
allows
handling
at
best,
signals
containing
strong
harmonic
components
(e.g.
generated
by
mixers).
During
the
configuration
phase,
it
is
possible
to
select
three
typical
filters
(with
moving
average)
and
5
DSP
filters.
The
former
allow
quicker
response
times
but
are
less
effective
with
regards
to
interferences,
therefore
they
must
be
used
when
extremely
quick
weight
variations
must
be
detected.
The
latter
allow
mitigating
interferences
(since
they
boast
a
higher
filtering
effect)
at
the
disadvantage
of
the
response
time
to
weight
variations.
In
both
cases,
the
higher
is
the
filter’s
number,
the
greater
is
the
filtering
effect
and
the
response
time
to
a
weight
variation.
For
example,
the
response
to
a
step
weight
variation
is
shown
in
the
chart
below,
based
on
the
selected
filter.
The
chart
shows
that
filter
FIR
1
boasts
a
response
time
of
approx.
0.2
seconds,
while
filter
FIR
5
boasts
a
response
time
of
approx.
2.5
seconds.
