SV: Re: SV: Re: [Fwd: Re: Op Amp pinouts was Re: [sdiy] more LM3900 stuff]

[Magnus Danielson]

From: harrybissell <harrybissell at prodigy.net>
Subject: Re: SV: Re: SV: Re: [Fwd: Re: Op Amp pinouts was Re: [sdiy] more LM3900 stuff]
Date: Sun, 22 Jan 2006 00:06:25 -0500
Message-ID: <43D312D1.4E863411 at prodigy.net>

> And I hope it has a real good sample hold on the display...
> 8 1/2 digits by 100,000 samples a second ??? I'll light
> the lab notebook on FIRE writing the values down so fast....

Not quite as high resolution when going that rate and also, this is what you
got GPIB for on the backside. It is there as a lab notebook fire-prevention
measure cortesy of HP (now Agilents).

Hmm, I still haven't been able to tame my DMM over GPIB and it annoys me. I do
have the users manual but it doesn't help me. Morrrr...
Writing your own software doesn't help obviously. I really wish to have my two
HP 3457A under GPIB control just as many of the other instruments.

Cheers,
Magnus

> H^) harry
> 
> karl dalen wrote:
> > 
> > The latest thing i heard was "6 1/2 digits"
> > and that was very good!
> > 
> > HP has invented a way to calibrate it away! ;-)
> > 
> > http://www.uni-konstanz.de/physik/Jaeckle/papers/thermopower/node1.html
> > 
> > Anyhow it do sounds like what you say, sales talk!
> > 
> > REG
> > KD
> > 
> > --- Grant Richter <grichter at asapnet.net> skrev:
> > 
> > > Your in the range of thermoelectric voltages produce by differing
> > > metals.
> > > I think they call it the "Seebeck effect".
> > >
> > > Probably a chapter on it in the DVM manual.
> > > Must be some amazing common mode rejection to get rid of RF hash.
> > >
> > > When I see figures like 0.00008% THD, I know it came from marketing
> > > and not engineering.
> > >
> > > I mean what is the X bar distribution on THD for practical
> > > manufacturing?
> > > Can the process be controlled? Do they test for the THD spec?
> > >
> > > Silly numbers stuff.
> > >
> > > On Jan 21, 2006, at 6:28 PM, karl dalen wrote:
> > >
> > > > Oh! Impressive!
> > > > ""8 1/2 digits with 10 nV DC resolution""!
> > > >
> > > > This is not any "off the shelf dual slope" ADC,ing thing!
> > > >
> > > > 10nV!! Slightest oxidation on a component
> > > > leg would ruin that i suppose! There must be
> > > > an entire manual of just cleansing legs before
> > > > measurements!
> > > >
> > > > KD
> > > >
> > > > --- Ian Fritz <ijfritz at earthlink.net> skrev:
> > > >
> > > >> At 12:01 PM 1/21/06, Ian Fritz wrote:
> > > >>> At 11:36 PM 1/20/06, Grant Richter wrote:
> > > >>>
> > > >>>>> Have you looked at the OPA134?  Distortion = .00008%
> > > >>>>
> > > >>>> How do you even measure that? A 24 bit sine wave is 0.001% THD
> > > >>>
> > > >>> I believe a 24 bit sine is better than that.  But, whatever, you
> > > >>> can get a
> > > >>> DVM with enough precision:
> > > >>
> > > >> <http://www.home.agilent.com/cgi-bin/pub/agilent/Product/
> > > >> cp_Product.jsp?
> > > >> LANGUAGE_CODE=eng&COUNTRY_CODE=US&NAV_ID=-11250.536881781.00&cmpid=96
> > > >> 200>
> > > >>
> > > >>>
> > > >>
> > > >> Crap, that link has a timeout.  Just go to agilent.com and look up
> > > >> the
> > > >> 3458A DVM.
> > > >>
> > > >>
> > >
> > >