Tektronix CSA7154, User Manual

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Glossary
CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual
Glossary- 5
Display system
The part of the instrument that shows waveforms, measurements, control
windows, status, and other parameters.
Dragging
The act of changing your touch panel selection by moving your finger
without removing it from the screen. The selection that is activated is the last
one that you were touching before removing your finger.
Dual Graticule
A display with two graticules. Each one is half the height of the single
graticule.
Fast Acquisition mode
A mode that increases the waveform capture rate up to 400,000 waveforms
per second. This very fast capture rate greatly increases the probability that
runts, glitches, and other short term changes will accumulate in waveform
memory. The instrument then displays the waveform at the normal display
rate using variable or infinite persistence. This display mode emulates the
display of an analog instrument.
Edge Trigger
Triggering occurs when the instrument detects the source passing through a
specified voltage level in a specified direction (the trigger slope).
Envelope acquisition mode
A mode in which the instrument acquires and displays a waveform that
shows the variation extremes of several acquisitions.
Equivalent-time sampling (ET)
A sampling mode in which the instrument acquires signals over many
repetitions of the event. These instruments use a type of equivalent-time
sampling called
random equivalent-time sampling , which uses an internal
clock that runs asynchronously with respect to the input signal and the signal
trigger. The instrument takes samples continuously, independent of the
trigger position, and displays them based on the time difference between the
sample and the trigger. Although the samples are taken sequentially in time,
they are random with respect to the trigger.