I noticed a lot of people comparing the noise floor in FFT graphs without considering FFT size/gain and scalloping loss.
There must be a better way do it?!
Manufacture datasheets seem to uses Voltage Noise Density:
To me it looks like this is the better way of specifying Noise because the its free from the uncertainty's introduced by FFT size/gain and and scalloping loss.
Alternatively there is this 1/3 Octave Band method:
lewitt seems to use this
But its also kind of confusing and i don't fully understand what Lewitt is doing, (actually it looks wrong to me)
is it clever marketing or actually the proper way to do it?
1. there graph is way higher resolution then 1/3 octave.
2. from beeping used to FFTs i would associate a flat line with White noise but in this 1/3 octave view it would correspond to Pink noise?
3. do other manufactures do this?
Is there a good way to show semi or quasi peak values in a noise (density) graph?
A FFT or any method with long averaging would be insufficient so show intermittent noise like clicks and pops every view seconds.
but with some sort of a peak hold it could be visualized?
There must be a better way do it?!
Manufacture datasheets seem to uses Voltage Noise Density:
To me it looks like this is the better way of specifying Noise because the its free from the uncertainty's introduced by FFT size/gain and and scalloping loss.
Alternatively there is this 1/3 Octave Band method:
lewitt seems to use this
But its also kind of confusing and i don't fully understand what Lewitt is doing, (actually it looks wrong to me)
is it clever marketing or actually the proper way to do it?
1. there graph is way higher resolution then 1/3 octave.
2. from beeping used to FFTs i would associate a flat line with White noise but in this 1/3 octave view it would correspond to Pink noise?
3. do other manufactures do this?
Is there a good way to show semi or quasi peak values in a noise (density) graph?
A FFT or any method with long averaging would be insufficient so show intermittent noise like clicks and pops every view seconds.
but with some sort of a peak hold it could be visualized?