Agilent Technologies 8504B - Reducing Displayed Noise

FINAL TRIM SIZE : 7.5 in x 9.0 in
Reducing
Displayed
Noise
The
precision reectometer
can
average
the
data
from
several
traces
.
A
veraging reduces
displayed
noise
especially
when
used
with
narrow
spans
.
F
or best
accuracy
,
use
averaging
on
the
minimum
span:
A
veraging
o.
A
veraging
on.
The
default
number
of trace
averages is
16.
Source Minimum
Span
(n
=
1)
1300
nm
1
mm
1550
nm
1.2
mm
In
wide
spans
,
the
precision
reectometer
captures
more
data
points
than it
can
display;
adjacent
data
points
are
grouped
and
then
the
maximum
point
for
each group
is displayed.
As the
span is
decreased, the
number of
points
per
group decreases
until
all
the
points
are
displayed.
Since, in wide spans
, the maximum value is averaged, there is a dierence
between the averaged value and the
true value of a signal. The dierence (or
inaccuracy) increases with noise or span.
3-9
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