HP 83480A User Manual

Eye, Mask and Eyeline Mode Measurement Tutorials
Testing to a Mask
Setting the time base
(mask-to-waveform
mode only)
1. Select 4
Time base
5 from the SETUP group on the instrument's front panel.
2.
Select
NNNNNNNNNNNNNNNNN
Units bit period. (HP 83480A only)
3. Select the bit rate of your transmitter.For this example, select
2.48832 GHz STM16/OC48 from the
NNNNNNNNNNNNNNNNNNNNNNNNNN
Bit rate softkey by selecting the
softkey. Scroll through the choices by using the arrow keys located next to
the knob.
4. Scale your waveform to show two complete crossings (see the previous
gure). Select the
NNNNNNNNNNNNNNNNN
Scale softkey and adjust the display with the arrow
keys, keypad, or the knob.
5.
Center your waveform on the instrument display. Select the
NNNNNNNNNNNNNNNNNNNNNNNNNN
Position
softkey
and
adjust
the
display
with
the
arrow
keys
,
keypad,
or
the
knob
.
NO
TE
HP
83480A
only
The
instrument
has
the
capability
to
set
its
horizontal
scale
in time
units,
as
is
typical
with
conventional
oscilloscopes,
or
in
a
scale
corresponding
to
bit
periods.
By selecting
bit
period
and
entering
the
bit
rate
,
the
time
base
can
then
be set
to
show
a
specic
number
of
bits.
F
or
instance
,
if
a
transmitter
is
operating
at
2.48832
Gbit/sec
,
select
the
STM16/OC48 setting
for
the
bit
period.
T
o
displa
y
two
complete
e
yes
of
the
pattern,
the
scale
is
then
set
to
two
bits.
If
the position
of the
bit
pattern
needs
to
be
oset
b
y
one
half
bit,
the
current
position
value
is
simply
adjusted
b
y one
half bit.
This
is
more
intuitive
than
working
directly
in
a
time
format.
5-30

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English