[sdiy] Trying to establish confidence in my test equipment

[Chris Manders]

Hi Tom

Yes, the LM199 is a very interesting device.
Seems to have its own inbuilt heater! Not only that,
the Datasheet . . .

http://cache.national.com/ds/LM/LM199.pdf

. . . has a example circuit as a portable calibrator.
Exactly the sort of thing!

I am not sure how easy it would be to get this
component (in the UK).

Chris



--- Tom Arnold <xyzzy at sysabend.org> wrote:

> On Wed, Mar 08, 2006 at 10:59:33AM -0800, Chris
> Manders wrote:
> > http://www.farnell.com/datasheets/23333.pdf
> > 
> > 5.000V and 10.000V exact references. I have the
> > calibration details downloaded off the net for
> both
> > the two meters I have. I could use these reference
> ICs
> > to generate voltages to calibrate them!
> 
> +- .1% or, I believe +-5mv.
> 
> I think to be a usable reference it'd have to be a
> 5.0000 reference +- .01%
> because then any error would be small enough as to
> be beyond what your ear
> would notice.
> 
> The Analog Devices AD584 is .05% initial accuracy
> although they say on the
> datasheet the 5.000v part is +-3mv max. ( AD584L )
> 
> National Appnote AN-161 ( using the LM199 ) and AN42
> from Linear
> Technologies ( several different chips used ) might
> be good starting points.
> 
> I'm trying to find some currently made high-accuracy
> voltage references just
> from a curiousity standpoint.  HP doesnt seem to
> make the modules they used
> to like I have, but I'm sure someone does.
> 
> And yes, when it comes to a reference standard, I am
> kinda anal retentive, I
> do in fact own a Cesium clock too and not a pansy HP
> one but one of 10 my
> dad built in the Army for testing relativity in the
> 1950s...
> ( I think its genetic )
> 
> -- 
> 
>
-----------------------------------------------------------------
>  - Tom Arnold       -  Free Synth DIY webspace
> http://www.sdiy.org 
>  - SynthGeek        -
>  - BBD Fanatic      -  "...is it a virus, a drug, or
> a religion?" 
>  - echo evho wjxo   -    Juanita Shrugs. "What's the
> difference?" 
>  --------------------  
> 
> 


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