I caught that as well, it confirms Dr Frank's assertion on the forum that they tried at least once and failed. I believe Dr Frank has inside contacts there. John mentioned ruefully the one original designer is still working, but working for the competition. That must be Wayne Goeke/ Fluke I think.
Well, I had personal phone contacts to Keysight people, when discussing with them these bugs on the 34465/470A ACAL DCV function.
Scott Stever was in the phone call, being introduced as the project manager for the 34465/470 DMMs.
Wayne Goeke is obviously responsible for the DMMs at Keithley, as the patent implies.
Both were the main engineers for the 3458As A/D, as can be seen in the hpj 4/1989, page 98.
This interview is really great and very interesting, regarding international development processes.
Would like to see more of videos like this.
Frank