[volt-nuts] Which meter?

[WB6BNQ]

Bram,

You need to consider a different method !  You would be better off renting a
Fluke 732 voltage transfer standard with current calibration and a Fluke 845A/B
(desk version - not the rack mount version) null meter.  The desk version has a
high isolation resistance then the rack mount unit.

The 845 series null meter has a DC output on the rear that is a full scale
representation of whatever scale you have selected on the front panel.  This way
you can use just about any piece of crap meter with computer connections to log
the results.

I am assuming you are setting the LTZ1000 to a standard 10 volts.  If not you may
need to use a good divider; either a Fluke 750A or the Fluke 720A Kelvin divider
if you have a weird voltage level below 10 volts.  If you have a voltage that is
higher then you may need a good high quality voltage source like the Fluke 332 or
335 or one of the newer ones from Fluke.

Bill....WB6BNQ


"The-al-bundy at home.nl" wrote:

> Hi Greg,
>
> Well I've made a design with the LTZ1000A and must test it's stability. The
> best DVM we have is the 34401, but with the 6.5dig you don't get far with a
> LTZ1000 as DUT. So we need something better. As far as I've seen the only
> options are the 8508A and the 3458A.
>
> The 8508A is relativly new (2002 I thought), so one would expect better
> specifications than the 3485A and more options like other connectivity than
> GPIB.
> However the 3458A is already around there for >20years and it seems to be
> one of the best DVM. The 100k sample rate is a feature which could be handy
> in the future.
>
> Money is not so much an issue, just we have to make a good investment for
> the next 5+ years or so.
> Of course we expect to use the DVM more often for ultra stabile
> circuits/sources (in currents as wel as volts).
>
> Thanks,
> Bram
>
> ----- Original Message -----
> From: "Greg Burnett" <gbusg at comcast.net>
> To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Sent: Saturday, November 14, 2009 6:52 PM
> Subject: Re: [volt-nuts] Which meter?
>
> > Hi Bram,
> > If you want to make high-speed measurements, the Agilent 3458A is the
> > clear
> > choice (because it can take up to 100,000 readings per second). The same
> > reasoning would apply if you need to use your DVM to make precision
> > digitization of waveforms. (For example the 3458A's triggered, digitized
> > measurements can be used to evaluate the linearity of a triangle
> > waveform.)
> >
> > For basic DC linearity (e.g., from full-scale to tenth scale or lower),
> > the
> > 3458A is as good as it gets, as far as I know.
> >
> > Having said that, there might be a particular application where the Fluke
> > 8508A would be your best fit? But I'm not sure about that. Do you have
> > specific measurement applications in mind?
> >
> > I've personally always been extremely impressed with the 3458A
> > performance,
> > so unless I had a specific measurement application (that I'd researched
> > and
> > found that was addressed better by the 8508A), I'd buy the 3458A.
> >
> > Best,
> > Greg
> >
> > ----- Original Message -----
> > From: "The-al-bundy at home.nl" <the-al-bundy at home.nl>
> > To: <volt-nuts at febo.com>
> > Sent: Saturday, November 14, 2009 8:03 AM
> > Subject: [volt-nuts] Which meter?
> >
> >
> > Hi,
> >
> > I'm at a point to purchase a new 8.5dig DVM. Choices are the (good old HP)
> > Agilent 3485A or the Fluke 8508A. The Fluke is almost 2x as expencive...
> >
> > My feelings say that the 3485A is still the best one out there, is that
> > true?
> >
> > Thanks,
> > Bram
> >
> >
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