DAQmx - Measure High Frequency 2 Counter Method
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Measure High Frequency 2 Counter Method
This example uses two counters to measure a high frequency TTL pulse. This method is helpful when the frequency to be measured approaches the frequency of the internal timebase. Synchronization error can become significant if other methods are used. We will use the high frequency of an unknown signal as our source, and count during a known period of time.
The first counter's output will be a pulse of known period. The second counter is configured for period measurement, the signal to be measured is connected to the source of this counter. The gate of the second counter is internally connected to the output of the first counter. Since we know the period of the pulse generated by the first counter, and we can measure how many edges of the unknown signal occurred during that time, we can calculate the frequency of the unknown signal.
Filename: 3063.vi
Application Software: LabVIEW Full Development System 7.1
Language(s): C, LabVIEW, Visual C++
Driver: NI-DAQmx 7.4
Filename: 3065.zip
Application Software: LabWindows/CVI Base Development System 7.1
Language(s): Visual C++, C, LabVIEW
Filename: 3064.zip
Language(s): C, Visual C++, LabVIEW
This example uses two counters to measure a high frequency TTL pulse. This method is helpful when the frequency to be measured approaches the frequency of the internal timebase. Synchronization error can become significant if other methods are used. We will use the high frequency of an unknown signal as our source, and count during a known period of time.
The first counter's output will be a pulse of known period. The second counter is configured for period measurement, the signal to be measured is connected to the source of this counter. The gate of the second counter is internally connected to the output of the first counter. Since we know the period of the pulse generated by the first counter, and we can measure how many edges of the unknown signal occurred during that time, we can calculate the frequency of the unknown signal.
Requirements
Filename: 3063.vi
Software Requirements
Application Software: LabVIEW Full Development System 7.1
Language(s): C, LabVIEW, Visual C++
Hardware Requirements
Driver: NI-DAQmx 7.4
Software Requirements
Application Software: LabWindows/CVI Base Development System 7.1
Language(s): Visual C++, C, LabVIEW
Software Requirements
Language(s): C, Visual C++, LabVIEW
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