[volt-nuts] 3458A question

[David C. Partridge]

To add some more information

The meter has now been on for a number of days with a newly cleaned 4 wire short in place all the time.

I have run a full CAL 0 to zero the offsets, but even so, and after running an ACAL 0, I get a DCV reading of -200 to -400nV (0.00040mV).

Is that normal?  I'd have thought it would typically be less than that given that the 1 year limit is 0.00106mV (1.06Uv).

Thanks again
David

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of David C. Partridge
Sent: 10 January 2018 10:25
To: 'Discussion of precise voltage measurement'
Subject: Re: [volt-nuts] 3458A question

Correction to -0.00060mV to -0.00070mV

Dave

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of David C. Partridge
Sent: 10 January 2018 10:14
To: 'Discussion of precise voltage measurement'
Subject: [volt-nuts] 3458A question

After running an ACAL 0 with a four wire short in place I get a DCV reading starting at about  -0.00005 mV to increasing to about 0.00060 to 0.00070 mV over a minute or so at which point it seems to stabilise.

Is this "normal" and if not what could be wrong (AZERO is turned on).

Dave

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