DSO203 GCC APP - Community Edition (2.51+SmTech1.8+Fixes)

[horse]

chip:

@chip

horse:

@horse

220 ac from wall it very very dirt source ))

because of many consumers like flyback power source, gas discharge lamp, etc

sine wave of 220 with transformer

220 ac spectrogram without second 100 Hz harmonic?
Very strange ))) just do not know what to suggest
How about your spectroscope dynamic range?