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Voltage Uncertainty : Confidence Level?

Hello,

 

I am currently using a PXIe-5114 from NI to measure a voltage.

I am interested in the uncertainty along the y-axis (voltage value measured) and the specifications mention among other things a "DC accuracy" with a formula (page 4). 

My question is then: what is the confidence level associated with this "DC accuracy" formula? 1 sigma (68%) or 2 sigmas (98%)?

 

Thank you for your help!

 

 

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