Re: [volt-nuts] 3458A in the SW Chicagoland area/Geller Labs references?

2017-08-12 Thread Andy Lawrence 
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  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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Re: [volt-nuts] 3458A in the SW Chicagoland area/Geller Labs references?

2017-08-11 Thread Illya Tsemenko 

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
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