HP 83480A User Manual

The Digital Communications
Analysis Menus
Measure Eye Menu
Figure
6-5.
Extinction
ratio
measurement.
K
ey
Path
4
Shift
5
4
Meas
ey
e
5
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Extinction
ratio...
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Dark
Cal
V
dark
is
determined
as
part
of
the
extinction
ratio
calibration
routine
.
In
this
routine
you
are
instructed
to
turn
o
the
transmitter
.
The
instrument
can
then
characterize
any
internal
noise
signals
present
and
remove
them
during
the
extinction ratio
calculations.
NOTE
The
dark
cal
routine
varies
slightly depending
on
the
calibration
status
of
the
instrument.
Whenever
the
channel
oset
calibration
is
invalid, the
dark
cal
routine
automatically
invokes
the
oset
cal
routine
(for
optical
channels
only).
As long
as
the
oset
cal
routine
remains
valid,
the
dark
cal
routine
performs a much faster oset correction.
6-33

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English