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

[harrybissell]

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....

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.
> > >>
> > >>
> >
> >