Reference
Logic Triggers
Edge triggering can trigger on most signals, and is the default trigger
type. Ed ge triggering sets the oscilloscope to trigger (acquire signal
data) when a signal m eets a specified signal slope and a single
voltage-threshold condition.
However, th ere are times w hen you need to trigger the oscilloscope
on a more complex signal, or when tw o signals meet a condition to
troubleshoot a problem. These problems include a pulse th at is too
narrow or wide, a nd situ ations in which o ne signal is true when a second
signal transitions from low to high.
Logic and Pulse trigg ering lets you further qualify the trigger
conditions by adding parameters such as pulse width, delta time, logical
comparisons of two signals, and dual threshold levels.
Thresholds. Both Pulse and Logic types trigger the oscilloscope wh en
one or tw
o signals are logically true. To determine whether a signal
is true or false, you must set a signal reference point that determines
whether a signal is in one of two states. You set this reference point by
specif
ying a threshold voltage level for each trigger signal. Crossing the
threshold level toggles the state value of that signal.
TDS3000C Series O scilloscope User Manual 117
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