Hi,
Just for the fun....
1e, 10V reference in a oven, measured with a fresh calibrated 3458a (+0,45PPM)
HP 34401A, 10V range 100PLC.
Keysight 34461A 10V range 100PLC.
Keysight 34461A 5K thermistor measuring the Temp in my LAB.
The measured time is approximately 24 hours.
The Temp measurement...
![](http://www.bramcam.nl/Diversen/34461a-drift-Temp-01.png)
10V 34461A after the use of zero key.
![](http://www.bramcam.nl/Diversen/34461a-drift-01.png)
![](http://www.bramcam.nl/Diversen/34401a-drift-01.png)
The 34401A and 34461A are both very good, they are less than 1PPM / Celsius :-)
Kind regarts,
Bklackdog