The Digital Communications
Analysis Menus
Time Base Menu
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Units
This function is only available with the HP 83480A, or if the HP 83480K
option is installed in an HP 54750A.
The Units function lets you set the instrument timebase to basic time units
or to bit period units. Bit period units provide an easy and intuitive way to
display digital communication signals. Instead of having to compute the time
interval required to display two bits or eyes, you can simply set the scale to
two bits. Refer to the Scale softkey, later in this chapter.
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ey
Path
4
Time
Base
5
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N
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NN
Units
time
or
bit
period
a
a
a
a
a
a
a
a
a
aa
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
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a
Bit Rate
This
function
is
only
available
with
the
HP
83480A,
or
if
the HP
83480K
option
is
installed
in
an
HP
54750A.
Bit
rate
allows
the
time
base
to
be
congured
for a
variety of
standard optical
and
electrical
telecommunications
rates
.
In the Bit Rate mode, the knob and arrow keys scroll between standard rates
for digital communications signals.To select a non-standard rate, enter the
rate from the numeric keypad. To enter values in Mb/s, enter the number
followed by
4
Eex
54
6
5
.To enter values in Gb/s, enter the number followed by
4
Eex
54
9
5
.
K
ey
Path
4
Time
Base
5
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
Bit
rate
6-45