General Purpose Oscilloscope Menus
Acquisition Menu
Note that averaging is particularly useful for single-valued waveforms, such
as pulses. Multi-valued waveforms, such as eye diagrams, are not improved
with averaging because the eye \collapses" to the average value between a
logic level one and logic level zero.Averaging can be used in conjunction
with optional Eyeline software (available with the HP 83480A) to view eye
diagrams for noise reduction and to view individual traces clearly.
Key Path
4
Acquisition
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Averaging
a
a
a
a
aa
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aa
aa
a
a
a
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Best
This
function
is
only
available
in
an
HP
54750A, or
an HP
83480A
with
the
HP
54755A
option
installed.
The
samplers
used
in
the
HP
54750A
and
HP
83480A
systems
have
a
certain
amount
of
passive
feedthrough.
This
feedthrough
is
corrected
by
a
compensation
circuit.
A
small
amount
of
feedthrough
does
remain
after
compensation
and
this
causes
slight
non-atness
in
a
step
response
.
Since
averaging
implies
single-valued
waveforms
,
the
Best
function
takes
advantage
of this
to further
improve
atness
.
This
is
done
by
taking
a
sample
with
the samplers
turned on
and then
with
the
samplers
turned
o.
The
two
results
are then
subtracted, thereby
removing the
residual
non-atness
.
Key Path
4
Acquisition
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Averaging
on
NNNNNNNNNNNNNN
Best
10-5
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