I´m using a RMS VI to see a rms value of a simple signal, like sin, but I observed that the value measured is about 15% under the correct value. I used the Spectrum Unit Conversion VI, but I heve the same problem, does anybody can help me?
When checking the function using a sine wave, make sure it has an integer number of cycles. If your wave does not contain an integer number of cycles, you will not get what you expect (0.707*Amp). If you are still having problems, post your code with a waveform (use Operate > Make Current Values Default)
