Hi, my name is Alan and I have just received my Picoscope 2205A which I intend to use for my hobby which is mainly to do with audio electronics (both solid state and valves). This new scope replaces an old Pico ADC-212.
There seems to be a constant level of noise on the output even if the input is shorted. If I switch to the Spectrum mode, the noise is at a level of about -104dB and is at that level right up to 12.5MHz. Do you think I have a faulty device or is this normal (or am I doing something wrong)? I don't see how I can accurately measure THD+N with this inherent noise present, or can it be compensated for somehow. Incidentally, I have tried it on both my desktop pc and my laptop running on batteries with the same result.