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HP 54540 Series - Page 238

HP 54540 Series
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Measurements
Calculating
Top
and
Base
The
greatest
number
of
data
occurrences
in
the
top
half
of
the
histogram
corresponds
to
the
top.
If
the
occurrence
count
is
less
than
five
percent
of
the
total,
the
top
defaults
to
the
value
of
the
absolute
maximum.
Likewise,
the
base
represents
the
level
with
the
greatest
number
of
occurrences
in
the
bottom
portion
of
the
histogram.
If
the
occurrence
count
is
less
than
five
percent
of
the
total,
the
base
defaults
to
the
value
of
the
absolute
minimum.
This
may
be
the
case
for
very
irregular
waveforms
or
those
in
which
the
voltage
rises
or
falls
slowly
over
time.
This
selection
technique
prevents
the
top
and
base
from
jumping
around
on
waves
with
even
histogram
distributions
such
as
triangle
waves.
It
also
allows
the
detection
of
the
top
and
base
for
low
duty
cycle
signals.
Once
the
top
and
base
measurements
are
complete,
Vtop,
Vbase,
and
Vamp
measurements
can
be
made.
13-7

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