Thanks Andy and all for the replies, I have some more reading to do but may
take one of you up on your generous offers.
Very cool idea on the traveling reference! Not sure I can contribute anything
towards the project since my only "good" meter is a recently calibrated 3456A,
but may just have to see about getting in on that! I finally registered on
EEVBlog, lots and lots to see and learn there.
In the meantime... Far as differential voltmeters go for this level of
accuracy, is a Fluke 893A really worth going to the trouble of overhauling, or
should I keep my eyes open for something just a little better? I have two of
these units, one basically works but is inaccurate, the other has no meter
deflection. The reference diode would likely be a candidate for improvement,
but wonder if the rest of the instrument could really take advantage of it.
Thinking thst something a little better, or perhaps just getting/rebuilding a
335A/D would be better bet than the 332B with an external differential meter.
Open to all thoughts, comments, and set-me-straight-isms!
Regards, Chris
Sent from my SMRTphone
-------- Original message --------From: Andy Lawrence <dr.die...@gmail.com>
Date: 8/12/17 7:44 AM (GMT-06:00) To: Discussion of precise voltage
measurement <volt-nuts@febo.com> Subject: Re: [volt-nuts] 3458A in the SW
Chicagoland area/Geller Labs
references?
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 <jasonpe...@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
> > _______________________________________________
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