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csignal-processingdata-acquisitionlabwindowscvi

Measure Volt DC from an Analog input into an array and Calculate Volt DC in RMS

I am developing Test automation in GeoTest ATEasy and LabWindows\CVI, in the tests i measure analog and digital outputs\inputs.

In one of the test i need to measure an Analog input which contains an audio signal - and verify its Hz and Volt DC RMS.

The audio Signal is 5Hz and 2 Volt DC in RMS.

I have the possibilty to measure multiple Volt samples into an array, but i need to decide what is the sample rate and the # of samples i want to sample.

After measuring, i need to verify that the signal is 5Hz and 2 Volt DC in RMS.

Any suggestion on how to analyze the data to see if the signal is actually 5Hz and 2 Volt DC in RMS?

I Need an algorithm, or a library function that can do these calculations.

What should my sample rate and # of samples (its also the size of the array) be?

Solution

  • If you have the Advanced Analysis Library (part of the LabWindows/CVI Full Development System), NI provides these capabilities for you in the functions RMS() and PulseMeas().