HP 83480A

Eye, Mask and Eyeline Mode Measurement Tutorials
Making Eye Diagram Measurements
Figure
5-3.
Extinction
ratio
measurement.
1.
Select
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Ext.
ratio...
from
the
softkey menus
.
Press
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Continue
to
activate
the
color
grade
database
,
if
not
currently
active
.
2.
Select
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Dark
Cal
from
the
softkey
menus
,
and
follow
the
instructions
displayed
on the
screen.
a.
Turn
o
the
laser
,
and
select
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Continue
from
the
softkey
menu.
This
establishes
a
basis
for
the
oset
level
of
the
instrument,
so that
a true
extinction ratio measurement may be made.
NOTE
The
dark
calibration
requires
that
the
signal
level,
with
the
laser o,
be
on
screen.
b. Turn on the laser
,
let it stabilize
, and select
4
Clear displa
y
5 from the
CONTROL group on the instrument's front display
.
5-11