Hi,
There is much talk on this forum about the LTZ1000 (a) and several multimeters like the 3458a.
I want to show you what is possible, with a TEK DMM4050 end one of my voltage references.
This is a link to the topic of the voltage reference that is used for this test.
Page two and schematic version 1.3 is the last one.
https://www.eevblog.com/forum/projects/10v-reference-(i-did-it-my-way)-no1/In my LAB i have 2x TEK DMM4050 and KeySight 2x 34461A and a 3458a, but no good script for the last one.
Both TEK DMM4050 multimeters are very stable and also a lot better than the KeySight 34461a multimeters.
The 34461a let u see 0,1 PPM or better resolution, but the temperature coefficient of these multimeters is not as good as that of the TEK DMM4050.
The TEK DMM4050 is "always on" 24/7/365.
I used the zero function one hour after being connected to the 10V reference.
The measurement is done at 100PLC.
OK, the drift picture.
The oven in my referent has about 60x reduction of the outside temperature, that is more than enough for the LT1021, it has a very flat temperature coefficient.
Even just now its still on 0.00000 afther almost 3 days.
Please ignore the error message, I had forgotten to remove it before I started to measure.
And fore everyone who like to play with excel =>
www.bramcam.nl/24H-11-Feb-2015-DMM4050-QuadOven-LT1021.csvThe two 34461a multimeters i own, are about 3 times as sensitive to temperature changes than the TEK DMM4050...
I'am happy with both instuments, these different instrument's have good and bad points, nothing new about that...
I hope you find this interesting because it often is just about the interface of multimeters and almost never of the stability of the multimeters!
Kind regarts,
Blackdog