How to Determine the Highest Frequency Analog Signal Sampling Rate
Analog signals have to be sampled to be converted into a format that can be used by digital circuits. Analog to digital converters are used to convert analog signals to digital signals. The frequency at which the analog signal is sampled determines the quality of the converted digital signal. An optimum sampling frequency has to be determined based on the frequency of the analog signal to be sampled. The sampling can be performed using a data acquisition system.
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Instructions
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Note the frequency of the analog signal that has to be sampled. Call it "Fin."
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Multiply the signal with 10. Call the result as "Fs," i.e. "Fs = 10 * Fin." The minimum frequency of the sampling signal has to be at least 10 times the frequency of the signal to be sampled in order to correctly reproduce the signal digital. Choose Fs as the minimum value for sampling frequency. This is called as Nyquist frequency.
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Note the highest frequency of sampling allowed by your data acquisition system. The highest frequency that can be chosen to sample an analog signal is the maximum that the acquisition is capable of. This chosen highest frequency should be greater than 10 times the frequency of the analog signal to be sampled.
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