National Instruments DAQ X Series User Manual page 232

above high threshold.
Hysteresis
Then signal must go below low threshold
before Analog Comparison Event asserts.
Analog Comparison Event
•
Analog Comparison Event
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First signal must go
Figure 11-7. Analog Edge Triggering with Hysteresis Falling Slope Example
Analog Window Triggering—An analog window trigger occurs
when an analog signal either passes into (enters) or passes out of
(leaves) a window defined by two voltage levels. Specify the levels by
setting the window Top value and the window Bottom value.
Figure 11-8 demonstrates a trigger that asserts when the signal enters
the window.
Top
Bottom
Figure 11-8. Analog Window Triggering Mode (Entering Window)
11-7
Chapter 11 Triggering
High threshold
(Level + Hysteresis)
Low threshold
(Level)
X Series User Manual