If you followed along in that video where I went over some of the basic math and simulate the termination, I am suggesting it is the scopes input that screws up the response, which I assume is why graybeard asked my to look at it.
I enjoyed watching the video a lot, great presentation of measurements and their evaluation.
My takeaway was that for best performance, a custom termination is adjusted to the individual scope on which the termination is going to be used. I especially liked the use of an inductance to linearize the response. Felt like adusting a speaker crossover.
Thanks for the recording,
Christian
I was planning to make a terminator that I could trim. Ran some simulations for it but didn't have parts on-hand to construct it. OP who started the last thread had lost interest, so I saw no point taking it any further.
I summed it up in the end. For best performance, buy tools capable of making the measurements you need to make. You may be able to gain some performance by hacking up a custom terminator like I show but if you are working with say high speed digital, it is going to be difficult to match the performance of a better scope and probes. Of course, that can be six figures which is why you see old vintage equipment in my home lab.