The Instrument at a Glance
The Front Panel
4
Autoscale
5
The Autoscale key causes the instrument to quickly analyze the signal. Then,
it sets up the vertical, horizontal, and trigger to best display that signal.
Autoscale can nd:
Repetitive signals with:
frequency
50 Hz
duty cycle
>
1%
amplitude
10
mV p-p
or 120
Wp-p
(optical
signals
only
on
the
HP
83480A, 83485A
)
trigger
amplitude
>
20
mV
A
utoscale
looks
for
signals
on
all
channels
,
even if
they are
turned
o.
It
also
searches
for
a
trigger
signal
on
the
external
trigger
inputs
.
HP
83480A
Option
100
only:
If
no
trigger
signal
is
detected
at the
external
input,
and
the
instrument
is
in
the
2.5
GHz
trigger
mode
, the
sweep
will
stop
.
If
the
instrument
is
in
the
12
GHz
trigger
mode
,
it
will
sweep
continuously
in
\freerun"
condition.
If
the
A
utoscale
key
is
pressed
unintentionally
,
use
the
Undo
A
utoscale
function
to
return
the
instrument
to
the
settings
that
existed
prior
to
pressing
the
A
utoscale
key
.
T
o
undo
an
A
utoscale
function
press:
4
Shift
5
,
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
Undo Autoscale
To quickly rescale the vertical axis,
without
altering the timebase, press:
4
Channel
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Channel Autoscale
(only on
HP 83480A, 83483A, 83485A
)
1-10
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