TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
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Delayed Triggering
The digitizing oscilloscope provides a main time base and a delayed time base.
The delayed time base, like the main time base, requires a trigger signal and an
input source dedicated to that signal. You can only use delay with the edge
trigger and certain classes of main pulse triggers. This section describes how to
delay the acquisition of waveforms.
There are two different ways to delay the acquisition of waveforms: delayed runs
after main and delayed triggerable. Only delayed triggerable uses the delayed
trigger system.
Delayed runs after main looks for a main trigger, then waits a user-defined time,
and then starts acquiring (see Figure 3–4).
Wait User-specified
Time
Acquire
Data
Wait for
Main
Trigger
Figure 3–4: Delayed Runs After Main
Delayed triggerable looks for a main trigger and then, depending on the type of
delayed trigger selected, makes one of the types of delayed triggerable mode
acquisitions listed below (see Figure 3–5).
Wait User-specified Time,
Number of Delayed
Trigger Events or Number
of External Clocks
Wait for Delay
Trigger Event
Wait for
Main
Trigger
Acquire
Data
Figure 3–5: Delayed Triggerable
After Time waits the user-specified time, then waits for the next delayed trigger
event, and then acquires.
After Events waits for the specified number of delayed trigger events and
then acquires.
After Events/Time (TDS 510A only) waits for the specified number of delayed
trigger events, then waits the user-specified time, and then acquires.
External clks (TDS 400A) waits for the specified number of external clocks and
then acquires.
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