Please look carefully these images (If anyone wants try to replicate it. The sigal is a pulse of 3.3V, wide 50ns and rise time 2ns):
First, all the measurements were performed under the same conditions and with the same probe (Agilent 10073D).
Now let us assume that the signal integrity is maintained in both oscilloscopes, and that ~8bits can't give us more.
The wave "form" is constantly changing in the SDS8102V, depending of the scale V/div, but at least it maintains the peak's amplitude within of a range, between the different scales (at least as far as ~ 8 bits reach).
But please:
- One volt peak that comes and goes in the DS2072 depending of the scale V/div.
For 200mV/div the peak's amplitude is 1V and for 50mV/div and 100mV/div the peak's amplitude is ~ 300mV! Note 1: In both oscilloscopes the acquisition mode is
peak (for all the acquisition modes occurs exactly the same).
Note 2: I've tried with all these probes:
- RP3300 BW: 350MHz.
- P6200 BW: 250MHz.
- T5100 BW: 100MHz.
And the same thing is still happening.
What the hell is going on?