It is very nice of someone do tests and show images about:
Scope (DS2000: 70, 100 or 200MHz model) settings 1 or 2 channel in use.
Full BW
(Just all settings so that pure maximum level of front end peak-peak noise is visible on the screen.)
As I have a 2102, I implicitly some bandwidth limiting. Did you want dots or vectors?
2102 have of course some amount less noise as 2202.
the purpose is to see the actual analog front-end peak to peak noise level (including ADC).
Peak-to-peak instead of rms noise level is what we meet with the measurements if can not use any methods for hide this noise. Of course rms numbers, depends of method, give more nice values and manufacturers like show these, if they show any number about noise levels.
Agilent:
http://cp.literature.agilent.com/litweb/pdf/5989-3020EN.pdf"Peak-to-peak Noise: the peak-to-peak range of noise in an oscilloscope based
on a particular criterion such as time, number of acquisitions, and/or acquisition
memory depth.
RMS Noise random noise measured as
one standard deviation"
It is just the same as the pulse generators, for example, where the manufacturer like to tell us the rms jitter value, but the user will have to live, however, with peak to peak values. And more fun come when they do not tell us how they have measured and calculated rms. If now need sure know what is real peak to peak example so that 99.99% of samples are all inside some value (IF distribution is gaussian true random)... well... with what number you multiply this rms value. Is it ten or more...
Sure, I know that the noise images are "ugly", but it is a reality.
Of course, in practice, it is possible depending on the situation, "filter" produce noise out of sight. For example, using the BW limit, or waveform average (usual average) or High-Res (other kind of averaging with low speeds as long as true to the ADC sample rate is much higher than displayed sample rate)
No average, no any kind of filtering, no high res mode.
Horizontal speed: 1ms/div
Memory: 14M (memory depth not auto but 14M selected. Becouse acquisition peak detect there can also use example 1.4M or even less, no markable difference?)
Acquisition: Peak Detect
Sampling: Real time
Antialising: Off
Coupling: DC
BW limit: Off
Probe 1x (
Edit: in oscilloscope menu! Probe is not at all connected, open or terminated inputs)
Display: Vectors.
Sin(x)/x imitation or what ever it is and all other possible after ADC user adjustable filters off (if there is any).
Scope Input BNC: Just open, nothing connected (if have 50 ohm terminator and if it makes difference, then with terminator and without) (envinroment need be quite silent about EMI)
Also 50ohm terminators can use so that center pin do not make connection but still terminator works as emi shielding cap.Vertical:
500uV/div
1mV/div
2mV/div
5mV/div
10mV/div
(scope internal TFT images)