[volt-nuts] Basic question concerning voltage references

m k m1k3k1 at hotmail.com
Mon Feb 20 13:57:37 EST 2017

On 20/02/2017 18:46, Russ Ramirez wrote:
> I very much enjoy what is shared here. It has led me down the path of
> learning more about Metrology in general and the pointers to Flukecal site
> from here are appreciated.
> My question is this. If I measured a 10 volt reference known to be good to
> 8 1/2 digits, but with the LSD being > 0, assuming a transfer standard with
> traceability and documented uncertainties etc, would a 6 1/2 digit
> voltmeter read 10.00000 volts, or round up to the limits of its AD
> converter resolution; say X uV over 10.00000 volts?
> I hope this is not too basic a question.
> Russ
> _______________________________________________
Hi Russ,

some voltmeters will supply extra digits in the output they provide, but whether they are of any use depends upon how 
stable the reference is in that particular 6.5 digit dvm, unfortunately it needs a dvm with better capability to prove 
if those digits are believable.

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