Reference
The four logical com parison functions are AND, OR, NAND, and N OR:
The AND function means that if both signal logic states are true,
the condition is true, otherwise the condition is false.
The OR function means if either or both signal logic states are tru e,
the condition is true, otherwise the condition is false.
The NAN D function means that if both signal logic states are true,
the condition is false, otherwise the condition is true. This fu nction
is the inverse of the AND function.
The NOR function mean s if an y o r all of t he trig ger signal logic
states are true, the condition is false, otherwise t he condition is true.
This function is the inverse of the OR function.
Remember that the l ogic function evaluates the lo gic states of two
signals, and that the logic state of each signal depends on whether they
are set to high-true or low-true logic.
For example, assume that yo u want to trigger t he oscilloscope only
when signal one is low at the same time that signal two is high.
Therefore y ou want to:
Set a threshold level that is appropriate for each signal.
Set signal one to be true when it is lo w (low-true signal logic).
Set signal t wo to be true when the signal is high (high-true signal
logic).
Trigger when both conditions are true ( AN D trigger logic).
TDS3000C Series O scilloscope User Manual 119
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