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

[Grant Richter]

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.
>>
>>