Tektronix 2212 User Manual page 241

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.
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