Figure 3-4. Below-Low-Level Triggering Mode; Figure 3-5. Above-High-Level Triggering Mode - National Instruments DAQ PCI-4451 User Manual

Chapter 3 Hardware Overview
bandwidth of interest. This jitter has no effect on the processing of the data,
and you can decrease this jitter by oversampling.
There are five analog level triggering modes available, as shown in
Figures 3-4 through 3-8. You can set lowValue and highValue
independently in the software.
In below-low-level triggering mode, shown in Figure 3-4, the trigger is
generated when the signal value is less than lowValue. highValue is
unused.
lowValue
Trigger

Figure 3-4. Below-Low-Level Triggering Mode

In above-high-level triggering mode, shown in Figure 3-5, the trigger is
generated when the signal value is greater than highValue. lowValue is
unused.
highValue
Trigger

Figure 3-5. Above-High-Level Triggering Mode

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