Tektronix DAS 9221 Option 04, Руководство пользователя

Страница: 257 / 276

Glossary
Glossary–8
DAS System User Manual
Edge Positioning
The process of or ability to choose the relative position of the output channel
transitions of the pattern generator.
Edge-sensitive
A trigger specification term. An event recognizer is said to be edge-sensitive
when the event is only true in an acquisition cycle in which a transition
occurs on the selected channels. (See also Level-sensitive.)
Edge Triggering
A technique that uses a logic-level transition rather than a logic state as a
trigger condition. The logic analyzer would trigger on the transition to a
defined state. (See also Trigger.)
Event
See Simple Event and Compound Event.
Event Bus
Provides a means for modules to communicate low-speed events (
≥
40 ns) to
each other in real time.
Event Filter
A trigger specification feature that lets you specify the amount of time an
event must be present in order to be considered true.
External Clock
A clock external to the logic analyzer and usually synchronous with the
system under test. (See also Acquisition Clock and Internal Clock.)
External Clocking
A clock mode in which the sampling of input logic signals is synchronized
with the activity of the system under test. The representation of the signals is
stored in memory by what is commonly called the external (or synchronous)
clock (that is, a signal supplied externally to the logic analyzer).
Field
A display region containing a value (or values) that can be selected or modified.
Field Cursor
A screen marker used to move from field to field.
Field Note
A brief, on-line description of the field in which the cursor currently resides.
Part of the Notes System.
Fill-in Field
A display field that has no list of choices. Instead, you enter a value by
typing a string of characters into the field.