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Duty cycle measurement using NI DAQ USB-6003. (Help needed with C coding)

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Hello, I am a beginner using DAQ and my objective is to read absolute rotary encoder PWM output signal. Currently I have got NI DAQ USB-6003 which has only one counter and two PFI-0,1 channels. My encoder output frequency is 1.1kHz. Could anyone help me with duty cycle measurement? It would be really grateful if you can help me with the algorithm (C language) too. Thank you! 


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