Principles of Operation
29
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Frequency Measurement
Using software, specify the counter/timer mode as count, the clock
source as external, and the time over which to measure the frequency.
To specify the duration, you can use the Windows timer (which uses
a resolution of 1 ms), or if you need more accuracy than the Windows
timer provides, you can connect a pulse of a known duration to the
Counter 0 Gate signal.
If you are using a known pulse for the duration, specify the active
gate in software (high level or low level). When the operation starts,
read the number of counts that occurred when the gate was active.
You can determine the measurement period using the following
equation:
Measurement period = 1 * Active Pulse Width
Clock Frequency
You can determine the frequency of the clock input signal using the
following equation:
Frequency Measurement = Number of Events
Measurement Period
Make sure that the signals are wired appropriately. Refer to the
KUSB-3100 Getting Started Manual
for an example of connecting a
frequency measurement application.
Содержание KUSB-3100
Страница 10: ...Contents x...
Страница 14: ...About this Manual xiv...
Страница 15: ...1 1 Overview Features 2 Supported Software 3...
Страница 18: ...Chapter 1 4...
Страница 46: ...Chapter 2 32...
Страница 47: ...33 3 Supported Device Driver Capabilities...
Страница 86: ...Chapter 4 72...
Страница 87: ...73 5 Troubleshooting General Checklist 74 Service and Support 77...
Страница 100: ...Chapter 6 86...
Страница 101: ...87 A Specifications...
Страница 112: ...Appendix A 98...
Страница 113: ...99 B Connector Pin Assignments...
Страница 115: ...101 C Reading from or Writing to the Digital Registers...