After doing an ACAL, I got a reading of 1.0199986V on a voltage reference
set to 1.020000V

Over the next few minutes this edged upward and I'm now getting a reading
between 1.0199998 and 1.020000 which is what I'd expect.

Is what I'm seeing normal?

Dave

Hmmm - not using CuTe (TeCu) banana plugs, so it could just be thermals

Does anyone know where I can get some of these (and some spades) w/o paying Keysight a huge pile of Mars Bars

Dave
-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of David C. Partridge
Sent: 06 July 2017 09:36
To: 'Discussion of precise voltage measurement'
Subject: [volt-nuts] 3458A question

After doing an ACAL, I got a reading of 1.0199986V on a voltage reference set to 1.020000V

Over the next few minutes this edged upward and I'm now getting a reading between 1.0199998 and 1.020000 which is what I'd expect.

Is what I'm seeing normal?

Dave

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I noticed this behaviour after autocal also in my unit.
I think it may be caused by autocal procedure that exercise some relay
switch and this is resulting some uV offset due to EMF.
After waiting some time temperature will equalise again and accuracy will
be slight better.