I totally agree with you and I know exactly what you mean. I apologize if there is some confusion on my posts. The FG is NOT for my personal needs.
My lab is fully equipped with:
PG506
TG501 with a Rb time base
TG501 with High accuracy 5Mhz time base
SG503
SG504 (recently repaired)
067-0681-01 Tunnel Diode Pulser
2X type 284’s both repaired and rebuilt both with working TD’s
Type 106 High amplitude square wave generator
Type 184 Time mark generator
Type 191 Leveled sine wave generator
2x leo bodnar pulsers
I have a YouTube channel that currently has showcased rebuilding and aligning this listed equipment as well as scopes and I have gotten the function generator question SO much it is prompting a video as to WHY this is not the best solution and the appropriate gear should be used.
So the current idea is to do the alignment with a function generator taking care to make it as good as possible with available equipment. And then test the scope with the correct gear to see where it ends up. This might be good enough for some home techs. I can not speak to anyone else’s needs but my own.
It also does my fellow technicians no good if I acquire a scope calibrator from Fluke as this will not help with the exercise or what I want to show. The question being asked of me is if this is all I have how good can I get?
I also do not want to get a 20 Mhz FG and try to do a 100 Mhz scope This would more than a bit ambitious. But I also don’t want to shoot the budget and acquire something that a hobbyist might not have as well.
A channel link is here for reference -
https://www.youtube.com/c/ZenwizardStudios as well as in my signature