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Tektronix 2212 - Page 241

Tektronix 2212
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Glossary
Roll Time-Base Mode
The
digital time-base
mode
used
for
slow
bases
(50 s to 0.1
s). In Roll time-base
mode,
no
trigger is
accepted.
The
first
sample
appears
at
the
left edge
of
the
display;
the
display
fills from left to right. After
the
display
fills,
new
samples
appear
at
the
right
edge
and
the
old
samples
shift
lift
one
point
at a
time
to
accommodate
the
new
samples.
The
oldest
sample,
the
one
at
the
left edge
of
the
screen,
is erased.
This
gives
the
effect
of
the
waveform
continuously
scrolling
across
the
screen
from
right
to left.
RS-232
A
communication
interface
that
can
be
used
to
control
the
instrument
and
capture
data
remotely
from a
computer.
Sample
One
point
of
the
waveform.
Sample
Interval
The
time
interval
between
successive
samples
in
a
time
base.
Sampling
The
process
of
converting
a
portion
of
the
input
signal
to
digital form for
display
and
processing.
Two
general
methods
of
sampling
are: real-time
sampling
and
equivalent-time-
sampling.
Sample Interval
See
acquisition
sample
interval
or
display
sample
interval.
Sampling Rate
The
number
of
times
per
second
that
the
instrument
samples
the
signal
it
is receiving.
Seconds per Division
The
number
of
seconds,
or
fractions
of
a
second,
represented
by
each
major
division
on
the
horizontal
axis.
Selected Channel
The
channel
affected
by
changes
to
the
front-panel
controls.
Setup
A specific
configuration
of
front-panel
control
settings.
2212 User Manual
E-
7
I I

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