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-boun...@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-boun...@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 _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
