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Measuring frequency with NI USB 6009

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Hello, I have problem with counting edges. I have voltage-frequency conterter, so I change voltage and measure frequency by counting edges. I use DAQmx assistant (prepared block) and everything works good until voltage is 3,8V and frequency 70 kHz. Then counter shows 0 ...frequency = 0. Hardware is all right. It´s very strange that it´s working and then not.

Do you know where could by mistake? (... I know that it is probably imposible :smileyfrustrated: )

Thank you very much for ideas.


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