Re: [volt-nuts] 3458A drift checking question
the manual defines a 4 hours warmup time. after tat the meter is supposed to be within spec. then the note 18 test can be started (ACAL and reading the cal constant). then it should be left on for a couple of days before a new acal is done, ideally as long as the note 18 specifies (7days iirc) , however if you see there is no drift (against a known good 732A e.g.), then it might be shortened. my experience is, if an AD board has a drift issue, it drifts quite a bid in short time in most of the cases, have seen 10+ ppm a day. also, note 18 covers two drift issues, AD and REF board related drift. do not confuse. > Gesendet: Mittwoch, 10. Januar 2018 um 12:34 Uhr > Von: "David C. Partridge" > An: "'Discussion of precise voltage measurement'" > Betreff: [volt-nuts] 3458A drift checking question > > How long does the meter need to have been powered on before it makes any > sense to perform the Service Note 18 drift test? > > Thanks > 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.
Re: [volt-nuts] 3458A drift checking question
In message <000301d38a06$f6971650$e3c542f0$@perdrix.co.uk>, "David C. Partridge " writes: >How long does the meter need to have been powered on before it makes any >sense to perform the Service Note 18 drift test? I generally turn my meter on in the evening if I need it to be precise next day. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [volt-nuts] 3458A drift checking question
Few days usually enough. 10/01/18 19:34, David C. Partridge пишет: How long does the meter need to have been powered on before it makes any sense to perform the Service Note 18 drift test? Thanks 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] 3458A drift checking question
How long does the meter need to have been powered on before it makes any sense to perform the Service Note 18 drift test? Thanks 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.
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 -0.5 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.
Re: [volt-nuts] 3458A question
In message <003801d389fb$bbba1f10$332e5d30$@perdrix.co.uk>, "David C. Partridge " writes: >After running an ACAL 0 with a four wire short in place I get a DCV reading >starting at about -0.5 mV to increasing to about 0.00060 to 0.00070 mV >over a minute or so at which point it seems to stabilise. That is pretty normal, it's very hard to control temperatures so precisely that you don't get a few hundred nanovolts of seebeck voltage. If you touch the short with your finger, you will change the temperature enough that it registers clearly. I mount the short, then hang a piece of cloth over the terminals and wait about 15-30 minutes before I run ACAL 0 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] 3458A question
After running an ACAL 0 with a four wire short in place I get a DCV reading starting at about -0.5 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.
