1. 732A drift (Alan Ambrose)
 2. Re: 732A drift (Andre)
 3. Re: 732A drift (m k)

Ever wonder why they have  FOUR 732b units in a 734? (smile) You need at least 3 of anything unknown. 4 is better. On 8/31/2017 12:00 PM, volt-nuts-request@febo.com wrote: > Send volt-nuts mailing list submissions to > volt-nuts@febo.com > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > or, via email, send a message with subject or body 'help' to > volt-nuts-request@febo.com > > You can reach the person managing the list at > volt-nuts-owner@febo.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of volt-nuts digest..." > > > Today's Topics: > > 1. 732A drift (Alan Ambrose) > 2. Re: 732A drift (Andre) > 3. Re: 732A drift (m k) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 30 Aug 2017 16:33:55 +0000 > From: Alan Ambrose <alan.ambrose@anagram.net> > To: "volt-nuts@febo.com" <volt-nuts@febo.com> > Subject: [volt-nuts] 732A drift > Message-ID: <F18848E7-C3D6-4375-9F82-F7C6CEA2FB8F@anagram.net> > Content-Type: text/plain; charset="utf-8" > >>>> My 732A<x-apple-data-detectors://28> e.g. has a drift of only about 0.2ppm pa over a couple of year > Hope you don't mind me jumping on this thread and asking a basic question: is there any kind of procedure for the 'enthusiast' (say with single 3458A/single 732 and not say 4x732) to measure the drift of a particular 732. > > Alan > > ------------------------------ > > Message: 2 > Date: Thu, 31 Aug 2017 05:15:18 +0000 > From: Andre <Andre@Lanoe.net> > To: Discussion of precise voltage measurement <volt-nuts@febo.com> > Subject: Re: [volt-nuts] 732A drift > Message-ID: <1504156517622.25651@Lanoe.net> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, first post! > Yeah, I ran into this issue a while back. Fortunately for most applications 10mV resolution is fine (eg measuring charge state on Li-ion cells) but I did find that old meters do seem to experience random drift failures of precision resistors and more so trimpots. Would it be a good idea for someone to do a "732 FAQ" with likely faults that would cause a particular matrix of symptoms? > > Also how do you deal with failures where a precision component has "gone bad" ? Surely all the calibrations are suspect which is why any sensible engineer always has two references at a bare minimum and sets up a master/slave or main/backup then maintains a calibration table of each? so if a drift is seen then the "bad" unit can be dealt with sternly. > > I looked into making a 10.0000Vref a while back and had some success with active feedback via thermal pad: it almost worked but in the end it was cheaper and simpler to buy one ready made (cough REF02 /cough) > Also relevant, since originally buying my RS IDM65 you can now get I2C precision CT references which can replace the troublesome parts > with something that does not drift, ever! > > -Andre > > > ________________________________________ > From: volt-nuts <volt-nuts-bounces@febo.com> on behalf of Alan Ambrose <alan.ambrose@anagram.net> > Sent: 30 August 2017 17:33 > To: volt-nuts@febo.com > Subject: [volt-nuts] 732A drift > >>>> My 732A<x-apple-data-detectors://28> e.g. has a drift of only about 0.2ppm pa over a couple of year > Hope you don't mind me jumping on this thread and asking a basic question: is there any kind of procedure for the 'enthusiast' (say with single 3458A/single 732 and not say 4x732) to measure the drift of a particular 732. > > Alan > _______________________________________________ > 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. > > > > ------------------------------ > > Message: 3 > Date: Wed, 30 Aug 2017 20:12:46 +0000 > From: m k <m1k3k1@hotmail.com> > To: Discussion of precise voltage measurement <volt-nuts@febo.com> > Subject: Re: [volt-nuts] 732A drift > Message-ID: > <HE1PR0301MB2283CFEF8B3D344A07BAA9FE919C0@HE1PR0301MB2283.eurprd03.prod.outlook.com> > > Content-Type: text/plain; charset="utf-8" > > On 30/08/2017 17:33, Alan Ambrose wrote: >>>>> My 732A<x-apple-data-detectors://28> e.g. has a drift of only about 0.2ppm pa over a couple of year >> Hope you don't mind me jumping on this thread and asking a basic question: is there any kind of procedure for the 'enthusiast' (say with single 3458A/single 732 and not say 4x732) to measure the drift of a particular 732. >> >> Alan >> _______________________________________________ >> 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. >> . >> > Not really, you have a Voltmeter and a 732b, they drift a little, how do you know which one is drifting, and by how > much? you cant know unless you have at least one other unit to compare with, then you can build a matrix of all the > relative drifts and then guess which one is actually the most accurate... > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > volt-nuts mailing list > volt-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > ------------------------------ > > End of volt-nuts Digest, Vol 96, Issue 15 > ***************************************** > > --- > This email has been checked for viruses by AVG. > http://www.avg.com > >