If I make a device that can hold a stable voltage to 1ppm or less for 7 days an output 1mv to 100v, that had great value as a transfer standard for hobbyists. That could be nulled to a 732B and sent around anywhere in the world. You could use it to calibrate your hobbyist lab meters. That has business potential.
As for gathering data on monolithic ICs, that can actually prove to be useful as most IC manufacturers only gather initial data on 100 chips over 1000 hours. That's what goes into the datasheet. If we've got people gathering data on batches of chips for 10,000 hours, that's producing real data that could be very useful to others. That's science.
At any rate, no one is trying to replicate the 732B. I think the goal is to make a standard good enough to validate and maybe even calibrate up to 6.5 digit meters.
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The gentleman above was comparing his DiY standard to a 732B....
also where is the proof of holding such calibration? graphs, control to measure against....test methodology, ambient conditions....tes equipment certificates of cal etc etc etc
I am not saying I doubt you or what any of us here can or can't do....I can make a standard that holds as well.....but how would anyone accept that data, when it doesn't conform to industry specifications?
Also that statement about only characterizing a couple IC's isn't always the case....Ti actually has a massive, and in detail report of long term testing on the REF102....showing exactly how and when chips were chosen, ambient conditions...PSU injected error...uncertainty against a standard cell (null) etc....
I just don't understand what "breakthrough" anyone is going to have.....basically the ideal scenario (assuming you don't have the build quality of Awesome14's "ref") is that it follows the typical...min or max results of the datasheet....
not at all the case if you build your own discreet ref.....a nice current stabilized zener and stabilized precision amplifier to follow.....
I mean if the devices aren't to sell and make profit from, and all you learn is that it conforms to the datasheet (monolithic IC)....I don't get it?
Now implementing various forms of heater control...that is a different story. However that is far beyond the scope of the manufacturer, and you will still have pretty large obstacles to overcome to calibrate each unit....as the drift in each IC will be different.....so you would have to hand cal each device, burn in for 1k hrs min, then datalog the drift long term, before you could accept it as a usable standard.....