HP 83480A User Manual

The Digital Communications
Analysis Menus
Measure Eye Menu
Data is acquired, histograms are built, absolute maximum and minimum
voltage/power levels, as well as relative maximum (top) and minimum (base)
voltage/power levels, are determined. Crossing points of the eye are located,
the threshold levels are calculated, and then, depending on the specic
measurement(s) activated, the requested parametric measurements are
calculated (See \How to Make Waveform Measurements" in Chapter 7).
Up to four parametric measurements can be active any time a valid database
exists. These measurements can include any of the eye measurements
described in this section or those described in Chapter 8.
Eye measurements are performed only on a color graded database.Whenone
of the seven measurements located in the Measure Eye menu is selected, the
color
graded
database
will
be
activated
automatically
if
it
has
not
already
been
enabled.
N
O
T
E
The
accurac
y
of e
ye
measurements
depends
on
the
amount
of
data
in
the
color
graded
database
.
F
or
the
rst
few
seconds after
pushing
Clear
Displa
y
,
the
amount
of
data
ma
y
be
insucient
to
obtain
statistically
signicant
results,
and displa
yed
measurements
ma
y
show
large
variability
.
In
rmware
re
vision
A.02.00
and
abo
v
e
,
it
is possible
to
set
a
threshold
in
the
Dene
Measure
menu
so
that
measurement
v
alues
are
not
displa
y
ed
until
they
are stable
.
Refer
to
the
description
of
Measure
Complete
in
Chapter
10
for
more
information.
6-31

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English