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Everything posted by kkubik

  1. I didn't buy Analog Discovery to use a soundcard. Can you please explain what is AWG?
  2. Thank you guys for the input. I will try to understand all you are writing about, but so far i think i'm not wise enough to get it. Can you please simply tell me is it possible to measure THD as low as -80dB with AD2? And what causes a problem - built in generator or analyzer? Thanks.
  3. Thank you mister for a very nice answer, everything is clear now :)
  4. OK, thanks for the tip, but it only lowers the noise floor but doesn't reduce the distortion. Can you please answer my other questions? Thank you.
  5. Hello. I have a problem with my Analog Discovery 2, and it's existing since i received it. I wanted to test the device parameters and simply plugged W1 output to 1+ scope input. Twisted 1+ and 1- cables and shorted 1- input to ground. The measured NF is quite ok (but i thought it would be better) - it's around -91dBV. But THD is really high. I'm measuring a CABLE so there should be no distortion and I receive around -70dB dBV THD (so it's around 0,03%). The output waveform is 1kHz sine, amplitude of 2V. I use spectrum analiser with averaging on, I've set the highest range (50V) - using maximum range helped a bit but i'm still not there. The frequency range is 10Hz - 50kHz. Couple of screenshots should picture the problem. Are my settings wrong? Is waveform generator not precise enough? Is the input somehow clipping - if yes, why? Is Analog Discovery 2 simply not capable of measuring THD lower than -70dB? I also marked with light blue circle a lot of artifacts on the spectrum - what's that?! Thanks for the answer and have a nice day.