Keithley KUSB-3100, User Manual

Page: 42 / 129

Chapter 2
28
Counter/Timer Operation Modes
The KUSB-3100 module supports the following counter/timer
operation modes:
• Event counting, described on this page.
• Frequency measurement, described on page 29 .
• Edge-to-edge measurement, described on page 30 .
• Rate generation, described on page 31 .
Event Counting
Use event counting mode if you want to count the number of falling
edges that occur on Counter 0 In when the gate is active (high-level
gate or software gate). Refer to
page 26 for information about
specifying the active gate type.
You can count a maximum of 4,294,967,296 events before the counter
rolls over to 0 and starts counting again.
For event counting operations, use software to specify the
counter/timer mode as count, the C/T clock source as external, and
the active gate type as software or high-level.
Make sure that the signals are wired appropriately. Refer to the
KUSB-3100 Getting Started Manual for an example of connecting an
event counting application.