VK5RCIf you asking HPAK to repair your 3458A, you doing it wrong
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif)
.
Welcome to high-end gear. It's "normal" out there.
MacbethYes, but no. We want perfect, right? How much perfect is only matter of disposable funds available...
Drift ain't there now
![Rant :rant:](https://www.eevblog.com/forum/Smileys/default/rant.gif)
overnight span ~2.4ppm (temp change 26.1C to 30.3C), so that's OK.
I have wild theory now why it's not drifting now. No, A3 not changed, I did not even unscrew bottom cover yesterday. You guess?
![Cheesy :D](https://www.eevblog.com/forum/Smileys/default/cheesy.gif)