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They must have changed it on the HD model then, because that wasn't the case for previous Siglents I've looked at
Why can't they just copycat the UI from R&S or Keysight, I don't know..
Maybe we can make a noise comparison between Rigol and Siglent 12 bit scope. For this purpose, 8 files (binary) per device would be useful.Each with 50 Ohm and 1 MOhm1 mV/div with 200MHz and 20 MHz with the largest possible memory and highest sampling rate.And1 V/div with 200MHz and 20 MHz with the largest possible memory and highest sampling rate.The files would probably be quite large. But there are file hosters with free access and hopefully enough storage space.
Noise data for 1M memory depth, 1mV/1V, 20M/200M, and 50ohm/1Mopen all at 1ms/DIVhttps://eevblog.com/files/RigolHDO4000data.zip
....Getting those now.Maybe 1M memory is better as a standard?
Thanks! Can you confirm the LSB scaling? For RigolDS1-50ohm1mV20M.bin I am getting STD=19.8uV assuming full scale of 10 mV in 2^16 bits.Also need to know sampling rate to calculate PSD.
Quote from: maxwell3e10 on September 21, 2022, 03:17:58 amThanks! Can you confirm the LSB scaling? For RigolDS1-50ohm1mV20M.bin I am getting STD=19.8uV assuming full scale of 10 mV in 2^16 bits.Also need to know sampling rate to calculate PSD.4GS/s for all files.For actual LSB I don't know if there is a way to actually get this exact figure?As I showed in my video there is some extra dynamic range outside of the displayed window. So it's at least 8 divisions + whatever extra there is. Maybe 10V full scale?EDIT: Hang on, I think I know how to get this.
For 1 M Sample files it can't be 4GS/sec and 1 msec/div.
I have confirmed on the 100mV range that the dynamic signal acquisition range is about 960mVpp (assuming my Keysight 3000 sig gen is accurate.I did this by feeding in a triange wave, capturing, and seeing where it clips. 970mVpp definitely clipped.I assume the same on the 1V and 1mV ranges, so call it 9.60Vpp/4096 = 2.34mV/bit
Quote from: EEVblog on September 21, 2022, 04:27:20 amI have confirmed on the 100mV range that the dynamic signal acquisition range is about 960mVpp (assuming my Keysight 3000 sig gen is accurate.I did this by feeding in a triange wave, capturing, and seeing where it clips. 970mVpp definitely clipped.I assume the same on the 1V and 1mV ranges, so call it 9.60Vpp/4096 = 2.34mV/bitIt could be clipping before reaching full ADC range. Also the binary numbers are encoded in 16 bit unsigned integer. There should be some meta file saved along with binary data that would specify it. But 10 divisions full scale is probably fairly accurate.
It looks like it has a different amplifier path for 50 Ohm, giving lower noise at low frequency.The ffts and plots are made with Matlab.EDIT: Actually, to be sure, was the scope input grounded externally when on 1 MOhm setting, Dave? Because it gives std=48 uV, instead of 19 uV. I think you mentioned in the video it does not make a difference when using on-screen rms measurements.