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Improve initial error when ensure temperature with the ADR4530 ?

Category: Hardware
Product Number: ADR4530

Hey there,

for a lab project where we need ultra precise voltage reference, I wanted to use the ADR4530 as ref. 

In the datasheet it is stated that the B grade chip has initial error of 0,02% +/- .

Is this over the full temp range and is it improved when I can asure to keep temperature in the perfect range like in my graph below?

Thanks and best regards