Tektronix CSA7154, User Manual

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Glossary
Glossary- 16
CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual
Time base
The set of parameters that let you define the time and horizontal axis
attributes of a waveform record. The time base determines when and how
long to acquire record points.
Timeout trigger
A trigger mode in which triggering occurs if the instrument does NOT find a
pulse, of the specified polarity and level, within the specified time period.
Trace
The visible representation of an input signal or combination of signals.
Identical to waveform.
Trace Expression
The definition of what the trace displays. It can include one or more channels
combined arithmetically and modified by functions.
Trigger
An event that marks time zero in the waveform record. It results in acquisi-
tion and display of the waveform.
Trigger level
The vertical level the trigger signal must cross to generate a trigger (on edge
trigger mode).
Vertical acquisition window
The vertical range of the segment of the input signal that the acquisition
system acquires.
Vertical bar cursors
The two vertical bars you position to measure the time parameter of a
waveform record. The instrument displays the value of the active (moveable)
cursor with respect to the trigger and the time value between the bars.
Waveform
The shape or form (visible representation) of a signal.