Programming instructions

Chapter 24 Generating a Square Pulse or Pulse Trains
© National Instruments Corporation 24-9 LabVIEW Data Acquisition Basics Manual
Figure 24-11.
Frame 2 of Delayed Pulse (8253) VI
While this example works well for most pulses, it does have limitations
when your pulse delay gets very short (in the microsecond range), or
when the ratio of pulse delay to pulse width gets very large. For a
complete description of this example, refer to the information found in
Windows»Show VI Info…
.
Generating a Pulse Train
There are two types of pulse trains:
continuous
and
finite
. You can use a
continuous pulse train as the SOURCE (CLK) of another counter or as the
clock for analog acquisition (or generation). You can use a finite pulse train
as the clock of an analog acquisition that acquires a predetermined number
of points, or to provide a finite clock to an external circuit.
Generating a Continuous Pulse Train
How you generate a continuous pulse varies depending upon which counter
chip your DAQ hardware has. Most National Instruments DAQ devices
contain one of three different counter chips: the DAQ-STC, the Am9513,
or the 8253/54 chip. If you are not sure which chip your device uses, refer
to your hardware manual.