Hi,
I own a Voltcraft DSO-1062D, which I modded a long time ago to 200 MHz according to tinhead's instructions.
Now after seeing tatus' improvement I was curious and gave it a try.
At first I built myself the same pulse generator as tatus as I also had an eval board with the same microcontroller laying around.
This shows the rising edge of this pulse generator measured with an Agilent infiniium Scope 54825A (500 MHz, 2 GSa/s) with sin(x)/x inerpolation turnded off:
![](https://www.eevblog.com/forum/testgear/hantek-ds5000-series-300mhz-input-stage-mod/?action=dlattach;attach=314430;image)
The other images show this signal as measured by my scope before (i.e. with tinhead's mod) and after applying tatus' mod.
Unfortunately my scope can not be tricked to disable the sin(x)/x interpolation by choosing EquTime and dot display mode as with tatus' scope (my scope is HW 1007 and FPGA 83eb), so i assume interpolation was always enabled.
The overshoot was significantly reduced. In fact it is not overshooting at all, it just reaches the final level and then swings back a bit.
Next thing I will do is to adjust the attenuator, because when switching to 500 mv/div, the overshoot is a bit higher than on the 100 and 200 mV setting (see last attachment).