03-23-2016 04:06 AM
I am developing Test automation. in the tests i measure analog and digital outputs\inputs using NI DAQMX 6220
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 which functions to use on the data to see if the signal is actually 5Hz and 2 Volt DC in RMS?
What should my sample rate and # of samples be?
03-24-2016 10:13 AM
There's a WhitePaper that might help: Acquiring an Analog Signal: Bandwidth, Nyquist Sampling Theorem, and Aliasing