The Digital Communications
Analysis Menus
Time Base Menu
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Scale
The Scale function changes the sweep speed from 10 ps/div to 1 s/div.If
bit period has been selected for the time base units, scale is measured in
bits.You can change the sweep speed with the knob, keypad, or arrow
keys. The knob and arrow keys operate in two modes. One mode is a 1-2-5
step sequence, while the other mode is a ne mode that allows smaller
incremental changes. The keypad allows you to enter more precise values
than are possible with either the knob or arrow keys.
When the
instrument is
stopped,
and
you
expand
the
scale
,
the
instrument
redisplays the
signal at
the
new
scale
setting.
This
feature
allows
you
to
zoom in
or
to
zoom
out
on
the
signal.
If
you
watch
the
memory
bar
at
the
top
of the
display
,
you
can
see
what
portion
of
memory
you
are
zooming
on.
K
ey
Path
4
Time
Base
5
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Scale
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Position
The
P
osition
function
moves
the
sweep
horizontally
.
When the instrument is stopped, position allows you to pan across a signal.
The memory bar at the top of the display indicates the portion of memory
you are panning across.
The minimum position level is 22 ns, or the equivalent number of bits,
depending
on
the
bit
rate
selected.
K
ey
Path
4
Time
Base
5
N
NN
N
N
N
N
N
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N
N
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N
N
N
N
Position
6-46
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