Operation
Logic
Triggering
The available Counter/Timer/Trigger (CTT) enhances trigger selectivity. Sweeps can
be initiated by combinations of two vertical signals, defined by A Trigger and
B Trigger. The available Word Recognizer (WR) expands logic triggering to 17-bit
patterns, either synchronous or asynchronous.
Initiate
a Sweep
with
the
Logic Trigger
1.
Press the MEASURE button.
2.
Select MORE from the menu.
3. Select LOGIC-TRIGGER from the menu.
4.
Select the desired triggering function by pushing the appropriate menu
{VERTICAL MODE) button:
a. A-AND-B — Triggers the A sweep only on the coincidence of the
A trigger event and the B trigger event.
The A and B trigger events are considered to be logically true if the
trigger input signal is more positive than the trigger level and + slope is
selected.
If - slope is selected, a true state exists only when the input
signal is more negative than the trigger level.
b. A-OR-B — Triggers the A sweep on the occurrence of either the
A trigger event or the B trigger event.
The same rules for logic conversion of the trigger signal apply here as
they do for A-AND-B.
c. A:WR — Triggers the A sweep upon recognition of the specified digital
word for the Word Recognizer.
d.
B:WR — Triggers the B sweep upon recognition of the specified
digital word.
5. Set the A-Trigger and B-Trigger controls or the WR pattern for the
desired trigger.
When the B Sweep is triggered by the WR, delay-time or delta-delay-time time is
measured by the crystal-controlled timer. With any other logic-trigger function, delay-
time and delta-delay-time measurements are derived from delay settings or cursors.
2-32
2465B/2455B/2445B Operators
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