My Siglent SAG1021 arrived and did some testing directly at its outputs, here are the (to my surprise) results at a 1 Mhz 4 VPP square wave:
- Using hookprobe and clip: obvious ringing
- Using probetip and gndspring attachment: no ringing
- Using hookprobe and clip via breadboard probing setup: obvious ringing
- Using probetip and gndspring attachment via breadboard probing setup: no ringing
So my conclusion would be for the moment: The probe clipwire introduces ringing. The breadboard probing setup also, but might be clear of ringing if clip isn't used in the the ground connection.
I don't understand it at all!
15 min later....., it seems that the ground clip/wire of my used probe isn't conducting at all! (Tested that) My other probes don't ring in any of the above conditions.
So the verdict is that this setup isn't to bad in respect to ringing.