HP 83480A User Manual

The Waveform Measurement Process
Figure 7-2 shows the basic process used by the instrument when making
automatic parametric measurements such as rise time, Vp-p, or frequency.
These measurements can be made on input signals, stored waveforms,or
functions.
In order to start the measurement process, the instrument captures a data
record. From this data record, the instrument builds a histogram, recording
how many times each q level is present in the data record. (A q level is an
internal
voltage
representation.)
From
the
histogram,
and
from
the
data
record, the
absolute maximum
and minimum
power or
voltage
levels
,
as
well
as relative
maximum (top)
and minimum
(base) power
or
voltage
levels
,
are
determined.
A horizontal
time histogram
is
constructed
to
determine
crossing
points
for eye
diagrams.
Using
the
top
and
base
levels
,
threshold
levels
are
calculated.
The
data
record
is
again
analyzed
using
the thresholds
to
determine
signal
edges
.
Finally
,
with
all
this
information,
the
requested
parametric
measurements
are
calculated
as
shown
in
Figure
7-2
.
7-4

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English