No wonder this thing messes with photo sensors

That's in fact an option Tektronix provided an installation manual for.

One fancy plugin I have is this 7S12 TDR / Sampler. A plugin that itself has plugins, naughty.

Time Domain Reflectometry is used to detect and locate faults in cabling by sending a sharp pulse down the cable and measuring the reflections.

In the TDR configuration the right bay takes a pulse generator, such as the S-52, that achieves rise times of < 25 ps, while the left takes a sampling head. Sadly, I don't seem to have a pulse generator plugin.

What I do have however is the S-53 Trigger Recognizer and the S-2 Sampling Head, which provides me with a sampling setup with a 75 ps rise time. That equals to about 4.66 Ghz bandwidth.

That weird connector on the sampling head is a GR 874. It may look bend, but it's not. In the world of GR 874 there is no male or female, everything can mate with everything else. I might have cables. But luckily I have plenty BNC adapters

The S-2 is the thing I fixed earlier

It's so satisfying to dial right into the kink (of the cable).

Sampling is a technique to resolve repeating signals that would otherwise be too fast. The signal is sampled at certain intervals over many periods to reconstruct the waveform.