Hello,
I (dont) like these "artificial" tests "with sockets (non soldered)" at constant temperature and humidity keeping all stress from the references away.
What has this to do with a "real life" application in industrial environment?
Even a short period (perhaps 2 days at the week end) with different humidity which has a time constant of several days (more like 5-7 days) has more influence than all other effects during the whole 3kHrs.
with best regards
Andreas
Hobbyists are not the market they aim for. In industrial applications, you want stability. Removing a sensor unit from a production line for calibration is expensive in downtime and handling costs. The aim is to calibrate it once (after burn-in), install it and forget it. The sensor is sealed, and if necessary fitted with special membranes to allow for pressure relief and to keep humidity out, combined with humidity absorbing material. Anything that needs extra precision lives in a controlled environment (temperature, humidity, EMC). My employer has such an environment for the precision measurements toolmaking (diecast and plastic molds) needs.
I suspect the measurement regime Maxim chose is based on some MIL Std. and as such it is easily reproducible by anyone with similar equipment. Changing temperature and humidity (simultaneously? one after the other?) requires more detailed specifications: rate of change for example. How comparable are the measurements if your climate chamber is slower in changing temperature and/or humidity?
Standards often also specify the number of specimens you must test to get statistically relevant results - this gets expensive for hobbyists if precision references are involved
BTW "artificial" tests are the norm in industry standards work: take the LISN used in EMC work. The typical line impedance specified in the sixties is as artificial as it gets, but it is useful because everyone measures to the same standard, so results are comparable.
Sockets are not a problem, if you use the special type that is designed for burn-in: Teflon body with precision gold plated contacts - Fischer Elektronik still manufactures them:
https://www.fischerelektronik.de/web_fischer/de_DE/Steckverbinder/F03/Fassungen%20f%C3%BCr%20TO%20...-Geh%C3%A4use/search.xhtmlTo sum it up: this reference is NOT designed for metrology grade applications. It is nice if it works for our voltnut aims, but there is no guarantee. It works for applications that need a "set and forget" approach as in industrial applications, where calibration after burn-in is done once. We are not the market. Period.
Greetings,
Rainer