Lock-in amplifiers (Stanford Research Systems 830) display sine wave signals in RMS values SR830 Manual (page 3-3). One can use the internal buffer to rapidly measure a signal, storing up to 16000 points with a measurement rate of 512Hz. These points are RMS values of the original signal, if I'm not mistaken, and often slowly oscillate (due to a small frequency component not completely filtered out by the low pass filter). How does one 'average' these buffered points?
I'm not sure it makes sense to calculate the RMS value of a wave build up from RMS values, but taking the simple average of this wave also feels incorrect.
Thanks in advance!