Campbell-scientific CR1000 Measurement and Control System Manuale Utente Pagina 318

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Section 8. Operation
318
Using a pull-up resistor on digital I/O channels C1 - C8
8.1.5.3.1 Frequency Resolution
Frequency resolution of a PulseCount() frequency measurement is calculated as
where:
FR=Resolutionofthefrequencymeasurement(Hz)
S=ScanIntervalofCRBasicProgram
Resolution of TimerIO() instruction is:
where:
FR=Frequencyresolutionofthemeasurement(Hz)
R=TimingresolutionoftheTimerIO()measurement=
P=Periodofinputsignal(seconds).Forexample,P=1/1000Hz=
0.001s
E=Numberofrisingedgesperscanor1,whicheverisgreater.
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