Hacking the Rigol MSO5000 series oscilloscopes

[rolfdegen]

This is my 100 kHz pulse generator with Teensy4 (1GHz overclocking) and MSO5104 (350MHz hack). The best rise time is 1.12 ns. I measured directly at the BNC connector without a 50 ohm termination. Teensy4 output buffer impedance is 23R.

[BRZ.tech]

Hello
@rolfdegen
I tried using the nanoVNA square wave generator, which you can use a good 50 Ohm cable, and put a 50 Ohm load on the input of your MSO5000.

I used the nanoVNA H. As for the signal frequency, I suggest using higher than 10MHz. But it is worth doing several experiments.

I got the rise time lower than 1ns.

Good luck. 73.

[rolfdegen]

New measurement with a self-built Avalanche Pulser (Jim Williams). Pulserate is 106KHz

DIY Pulser

[rolfdegen]

This is without 50R resistor at the oscilloscope input and 50R coax cable (50cm long) at capacitor C1



And this is with 50 R resistor at the oscilloscope input and 50R coax cable (50cm long) at capacitor C1



And this is with 50 R resistor at the oscilloscope input and without  50R coax cable

[rolfdegen]

This is my Pulser on old Hameg HM203-6 scope 

[6SN7WGTB]

You get the same results as I do. We are at the ‘scope limit I think.

[rolfdegen]

There's news from me here...  https://www.eevblog.com/forum/blog/eevblog-306-jim-williams-pulse-generator/625/