When I apply 142mV (100mV rms) from the internal signal generator to Ch A I do measure:
Amplitude at peak: -20.69 dBV
Average amplitude at peak: 74.2mV
Why do I read 74.2mV and not 92.4mV that is equal to -20.69 dBV?
And why not 100mV or 142mV (peak value)?
According to the Picoscope 6 users guide (Spectrum measurements):
Amplitude at peak.
The amplitude of the peak signal value.
Average amplitude at peak.
The amplitude of the peak signal value averaged over a number of captures.
In other words: "Average amplitude at peak" should be equal to "Amplitude at peak" when the stddev is close to zero..
PicoScope® 6 - PC Oscilloscope software version: 126.96.36.199
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Model: PicoScope 4262