Data Translation DT3000 Series, User Manual, Page: 87 / 156

Chapter 6
86
Counter/Timer Operation Modes
DT3000 Series boards support the following counter/timer operation modes:
• Event counting
• Frequency measurement
• Rate generation
• One-shot
• Repetitive one-shot
Event Counting
Use event counting mode to count events from the counter’s associated clock input source.
You can count a maximum of 65,536 events before the counter rolls over to 0 and starts
counting again.
In event counting mode, use an external clock source; refer to page 84 for more information on
the external clock source.
Using software, specify the counter/timer mode as event counting (count), the clock source as
external, and the gate type that enables the operation. Refer to
page 84 for information on
gates.
Ensure that the signals are wired appropriately.
Figure 24 shows an example of an event counting operation. In this example, the gate type is
low level.
Figure 24: Example of Event Counting
Gate Input
Signal
low level
enables operation
high level
disables operation
External C/T
Clock
Input Signal
event counting
operation starts
event counting
operation stops
3 events are counted while
the operation is enabled
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com