HP 83480A User Manual

General Purpose Oscilloscope Menus
Dene Measure Menu
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Thresholds...
The Thresholds menu sets the measurement points that the automatic
measurements use for calculating the timing measurement results. The
threshold points are lower, middle, and upper.For example, rise time is
measured from the lower threshold to the upper threshold, while a width
measurement is made between two middle thresholds. The three threshold
choices are the standard IEEE measurement points 10%, 50%, 90% ,or 20%,
50%, 80% ,or user dened . The Upper, Middle, and Lower softkeys are
displayed when
user
dened
is
selected.
K
ey
Path
4
Dene
meas
5
N
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NN
NN
NN
NN
N
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N
Thresholds
.
.
.
N
N
N
NN
NN
N
N
N
N
N
N
N
N
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N
N
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N
NN
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N
10%,
50%,
90%
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
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NN
N
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N
20%,
50%,
80%
These
are
the
two
standard
pulse
measurement
thresholds
for
all
measurements
.
These
standard
thresholds
are
calculated
as
a
percentage
of
the
top-base
values
,
and
the
top-base
values
are
calculated
from
the
waveform
that
is
on
the
display
.
Make
sure
that
the
waveform
is
expanded
vertically and
horizontally
so
that
the
instrument
can
accurately
determine
the top
and
base
values
of
the
waveform.
However
,
if
too
much
of
the
top
and base
of the
waveform
is
on
the
display
,
it
may
reduce
the
number
of
sample points
on the
edge
of
interest,
which
may
reduce
the
repeatability
of
your measurements
.A
good rule
of
thumb
is
to
have
two
divisions
of
top
and
two
divisions
of
base
.
When the instrument cannot make the requested measurement, an error
message is displayed instead of a measurement result. Usually, this is because
there are not enough sample points, an edge is not on the display, or the
specied channel is turned o.
When the measurement result is followed by a question mark, this indicates
that the
waveform
is
clipped
high
or
low
,
two
points
were
not available
for
linear interpolation,
or
the
amplitude
of
the
waveform
is
too
small.
Key Path
4
Dene meas
5
NNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNN
Thresholds...
NNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNN
10% 50% 90%
4
Dene meas
5
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNN
Thresholds...
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNN
20% 50% 80%
10-9

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English