Hello All,
I posted this in Rec.Audio.Tech as well, and have received some excellent replies. I would like to see what other replies I may get to see if I can generate a concensus.
My question deals with the validity of my test setup and if THD+N is actually being measured. The setup deals with a DUT configured as a SE ended amplifier, BTL output. The input of the DUT is stimulated with a 1V@1kHz signal. The power supply rail is actually from a power amp superimposing a 100mVp@20Hz to 20 kHz ripple voltage on a 5Vdc signal. The DUT is being measured by an Audio Precision 2700, and the AP is setup to measure THD+N.
Would the ripple voltage on the rail be considered 'noise' in the THD
+N measurement; therefore, making this a valid THD+N measurement?Thanks in advance.