Many thanks to all for your replies on both these topics.  I have not addressed many of the comments regarding standards because I now have a LOT of material to go through, read, and understand.  Also looking at purchasing a copy of the Fluke "Calibration: Philosophy in Practice" which will hopefully learn me a thing or two.  If anybody has other suggested reading material, please do share. On the Fluke 332B, it's alive!!  I went ahead and just shotgunned all the electrolytics since so many were bad, and that alone (more or less) fixed the instrument.  It seems very stable, output after just a minute or so has not budged in 12 hours.  10V measures 10.0020V on the HP 3456A.  Odds are both units are out of cal so I'm not doing any tweaking just yet.   A list member suggested that perhaps there is another volt nut near me who might possibly offer some assistance.  I am in a far Southwest Chicago suburb, if there IS anyone on list who has the ability, and time or desire to assist me in getting one or both of these units into cal I would certainly be very appreciative!  Now knowing just enough to be dangerous, I fear I have very much to read and even more to spend in order to truly calibrate anything to this level of accuracy.  Example, several hundred or thousand dollar plus calibrators or Kelvin-Varley dividers are _not_ in the budget for any foreseeable amount of time.  If it was, I would have just bought a freshly cal'd 3458 and been done with it :) Regards, Chris Farley  Sent from my SMRTphone

Greetings all, As suggested several months ago, I'm put out an inquiry/request to see if there's anybody in the area who has an HP3458A or better anywhere near me down here in Sandwich, that I might be able to either A) compare readings to my 3456A, or possibly use (without removing from your premises, obviously) use to calibrate my Fluke 332B.  I have means to keep my units powered during transport, so hopefully would not require hours of sitting to stabilize before taking any readings.  The 3456A's limitations are really being stretched, in trying to calibrate a 332B with it alone.  Alternatively, is anybody aware of a Geller Labs (closed) voltage reference available on the used market, or something of equal or better precision available today?  The Malone Electronics VREF10-003 looks very interesting, with supposed 6mos accurace of ±300uV.  Regards, Chris

Hi Chris, I plan to be near Chicago for few weeks around Xmas. I could take one of my LTZ references with me, if you want to meet up and do some tests. I don't have plans bringing any DMMs yet though. As of references, you could build your own LM399 based or LTZ-based references, and have somebody measure it for you. I did so for few EEVBlog metrology section members earlier this year, with my PCB "KX" modules which is LTZ1000-based design. I don't sell any finished units though. BR, Illya 12/08/17 5:55, Chris Farley via volt-nuts пишет: > Greetings all, > > As suggested several months ago, I'm put out an inquiry/request to see if there's anybody in the area who has an HP3458A or better anywhere near me down here in Sandwich, that I might be able to either A) compare readings to my 3456A, or possibly use (without removing from your premises, obviously) use to calibrate my Fluke 332B. I have means to keep my units powered during transport, so hopefully would not require hours of sitting to stabilize before taking any readings. The 3456A's limitations are really being stretched, in trying to calibrate a 332B with it alone. > > Alternatively, is anybody aware of a Geller Labs (closed) voltage reference available on the used market, or something of equal or better precision available today? The Malone Electronics VREF10-003 looks very interesting, with supposed 6mos accurace of ±300uV. > > Regards, > Chris > _______________________________________________ > 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.

Hi Chris, You might consider taking a look at the EEVBlog USA Cal Club thread. We are mailing a Geller Labs reference around the country. The reference doesn't have a lot of history built up yet, and we haven't tried shipping it back and forth between the same two parties multiple times to characterize shipping-induced instability, but it has been in the hands of a couple of 3458A owners, so its uncertainty is a bit of a mixed bag at the moment. Either way, its fun to participate :) http://www.eevblog.com/forum/metrology/usa-calibration-club/ -Jason Pepas On Fri, Aug 11, 2017 at 4:55 PM, Chris Farley via volt-nuts < volt-nuts@febo.com> wrote: > Greetings all, > > As suggested several months ago, I'm put out an inquiry/request to see if > there's anybody in the area who has an HP3458A or better anywhere near me > down here in Sandwich, that I might be able to either A) compare readings > to my 3456A, or possibly use (without removing from your premises, > obviously) use to calibrate my Fluke 332B. I have means to keep my units > powered during transport, so hopefully would not require hours of sitting > to stabilize before taking any readings. The 3456A's limitations are > really being stretched, in trying to calibrate a 332B with it alone. > > Alternatively, is anybody aware of a Geller Labs (closed) voltage > reference available on the used market, or something of equal or better > precision available today? The Malone Electronics VREF10-003 looks very > interesting, with supposed 6mos accurace of ±300uV. > > Regards, > Chris > _______________________________________________ > 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. >

If for some reason the US Cal Club doesn't fit for you: My parents live north of Chicago in Lindenhurst, and I *might* be visiting there for X-Mas this year. Or if you get really motivated I live in Terre Haute IN, which is probably only 3 hours south of you. Only one point of history but I have two recent cal'ed 3458As and a 731B. BR Andy On Fri, Aug 11, 2017 at 6:51 PM, Jason Pepas <jasonpepas@gmail.com> wrote: > Hi Chris, > > You might consider taking a look at the EEVBlog USA Cal Club thread. We > are mailing a Geller Labs reference around the country. > > The reference doesn't have a lot of history built up yet, and we haven't > tried shipping it back and forth between the same two parties multiple > times to characterize shipping-induced instability, but it has been in the > hands of a couple of 3458A owners, so its uncertainty is a bit of a mixed > bag at the moment. > > Either way, its fun to participate :) > > http://www.eevblog.com/forum/metrology/usa-calibration-club/ > > -Jason Pepas > > > On Fri, Aug 11, 2017 at 4:55 PM, Chris Farley via volt-nuts < > volt-nuts@febo.com> wrote: > > > Greetings all, > > > > As suggested several months ago, I'm put out an inquiry/request to see if > > there's anybody in the area who has an HP3458A or better anywhere near me > > down here in Sandwich, that I might be able to either A) compare readings > > to my 3456A, or possibly use (without removing from your premises, > > obviously) use to calibrate my Fluke 332B. I have means to keep my units > > powered during transport, so hopefully would not require hours of sitting > > to stabilize before taking any readings. The 3456A's limitations are > > really being stretched, in trying to calibrate a 332B with it alone. > > > > Alternatively, is anybody aware of a Geller Labs (closed) voltage > > reference available on the used market, or something of equal or better > > precision available today? The Malone Electronics VREF10-003 looks very > > interesting, with supposed 6mos accurace of ±300uV. > > > > Regards, > > Chris > > _______________________________________________ > > 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. > -- projecthuh.com Never underestimate the carelessness of boredom... Most people prefer Windows because most people are idiots...