How to measure the analog input signal‘s frequency by USB-6341

[HahaMama]

Hi  all:

I want to measure the analog signal's frequency by USB-6341.

When i open the add channels button,there is the frequency option there, but after i open it,it shows that NO supported devices found.

So the USB-6341 not support this measure or need some others setting?

would you help to provide a detail guide for frequency test?

[GerdW]

Hi Mama,

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@HahaMama wrote:

I want to measure the analog signal's frequency by USB-6341.

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Create a simple voltage measurement task and read your signal.

Then use one of those SignalAnalysis functions on your signal to determine frequencies…

[HahaMama]

hi GerdW：

How to use SignalAnalysis functions？Any detail guideline?

[GerdW]

Hi Mama,

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@HahaMama wrote:

How to use SignalAnalysis functions？Any detail guideline?

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There are functions to determine spectra and main frequencies, so use them to find your main frequency...

[NIquist]

Your screenshot shows NI-MAX where you are trying to create a task to add to LabVIEW.  You don't need that until you get more experience.

Just open the example called Voltage - Continuous Input to read your signal.  Add the Extract Signal Tone Info VI from the Signal Processing > Wfm Measure palette that GerdW mentioned and simply connect the waveform output to it.  Also add an array indicator and you will be able to read the detected frequency(s).

You will find that there are so many examples (Help > Find Examples..), that almost anything you want to code has an example to get you started.  Make sure you play around with all the parameters so you can learn what they do.  The example is defaulting to very low sampling rates so it can work with cheap DAQs.  You have a faster 6341 card so you can use higher sampling rates for better frequency ranges.

Also, check this page for NI DAQ tutorials:  Getting Started with NI-DAQmx - NI    SKIP the sections on the DAQ ASSistant!  It is a waste of time.