How to Measure frequency of less than 300 Hz

Is it possible to measure frequency without a counter module? All I have is a cDAQ with 9205, 9221 and 9263 modules.

Hello,
I am assuming that you want to measure analog frequency, since you have analog input and output hardware.  There is a useful LabView Help file titled Measuring Analog Frequency.  You will be able to measure analog frequency using just software and no counters.  However, this involves using Fast Fourier Transform (FFT) functions that are only available in LabView Full and Professional versions.  Please also take a look at the examples in the Example Finder.  Some helpful ones are titled … Signal Generation and Processing.vi, Spectrum Measurements.vi, and Simple Spectrum Analyzer (sim).vi.  These example’s block diagrams are a little busy, however you can see how they are using simulated signals with the FFT Power Spectrum.vi.  Note that the example titled Spectrum Measurements.vi uses express functions.  These functions are going to involve less programming, but offer lower program efficiency.
Samantha
National Instruments
Applications Engineer

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