Hi,
My DS203 is harwdare version 2.73.
I just made the modification suggested by bielec:
For ch A.
Remove C73
C11=1.5pF
Across R17 3.3pF
Across R21 22pF
C9=1.5pF
Across R15 3.3pF
Across R19 12pF
For ch B.
Remove C74
C12=1.5pF
Across R18 2.2pF
Across R22 15pF
C10=1.5pF
Across R16 2.2pF
Across R20 12pF
I can confirm a bandwidth of about 11MHz at all input gain stages. This is the maximum possible bandwidth with the used amplifier. At low sensitivity higher bandwidth is possible.
At frequencies higher than 1 MHz there is notable jitter because of unstable trigger I think. Maybe this can be overcome with an improved software.
At the digital inputs I found that rectangle signals with an amplitude of 5V can be measured up to a frequency of about 4 MHz.
Greets
Ingo.