So sorry for late responce :oops: Freq: 133Khz Voltage: 2.01 Vrms clean sinus Probe 1:1 Spectrum setup Sample interval: 3,200uS Sample rate: 312,5 kS/s No. samples: 32,768 Window: Blackman No. Bins: 16384 Meassurements: Range +- 20V: 8,8 dbV Range +- 10V: 8,8 dbV Range +- 5V: 8,8 dbV Range +- 2V: 7,...