Chapter 2
Hardware Overview
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National Instruments Corporation
2-7
Pulse Delay
Pulse delay is the amount of time between a trigger and the first (assertion)
edge of an output pulse. The pulse delay is configurable in units of
microseconds or quadrature encoder counts. If configured for
microseconds, available values are between 1 µs and 4,294,967,295 µs,
which is 4,294 seconds, or approximately 71 minutes. If the delay is
configured for quadrature encoder counts, the range of choices is 0 counts
to 4,294,967,295 counts.
Pulse Width
Pulse width is the amount of time between the first (assertion) edge of a
pulse and the second (deassertion) edge. Pulse width is configurable only
in microseconds from 1 µs to 4,294,967,295 µs.
Trigger Polarity
Each pulse generator can be individually configured for rising or falling
edge triggering. Even if multiple pulse generators are using the same
trigger, each can have different polarities.
Figure 2-2 shows the output of a pulse generator configured to look for a
rising edge trigger and output a high pulse with a microsecond delay and
width.
Figure 2-2.
Pulse generator output when configured to detect rising edge trigger
Pulse
Width
Trigger
Delay
