Hi everyone, I'm trying to develop ad ultra stable reference using the ADR1399, I've been studying circuits for weeks, even those using the LTZ1000, and I'm getting everything figured out, also thanks to countless simulations (I can't believe how useful LTSpice is)
However, there's one thing that bothers me: hysteresis effects. I know that to have an extremely stable voltage one must keep the device powered on like the famous Fluke 732 standard, but that would be very inconvenient.
I was wondering if you happen to have any information on the hysteresis effects with the LM399 or the ADR1399, especially the effects of repeated power cycles on the long and short term stability of the zener.
I have already ordered an evaluation board to do some experiments, but i really don't have the equipment right now to start counting ppms. All I have is a calibrated 34401A, but soon i'll buy a DMM7510 or even a 3458A if I find a good deal.