Pulse Width; Trigger Polarity - National Instruments PCI-8254R User Manual

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 width and
delay.
Figure 2-3 shows how to create a high and low pulse train with a
microsecond delay and width.
© National Instruments Corporation
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Delay
Trigger
Pulse
Figure 2-2. Output pulse generator
High Pulse Train
Delay
Low Pulse Train
Software
Start
Figure 2-3. High and low pulse train
2-7
Chapter 2 Hardware Overview
Width
Width Delay Width
NI PCI-8254R User Manual