# Unit of Expanded Uncertainty in Percentage

A

#### akmal122g

Hello. Can someone teach me how to convert the unit of expanded uncertainty for current from percentage to ampere? Example in this certificate is

Nominal value = 1 A
Measured value = 1.0001 A
Error = 0.0001 A
Expanded uncertainty = 0.04 %

Thank you.

S

#### stefanhg

Unit of absolute expanded uncertainty = Unit of measured value

A

#### akmal122g

So the expanded uncertainty is 1.0001 * 0.04%=0.0004 A. Am I right?

S

#### stefanhg

Yes,

0.0004 A or 0.4 mA

#### Hershal

##### Metrologist-Auditor
Trusted Information Resource
The math seems right but the application is the key. If reporting a single measurement, then the same unit is preferred. If across a range, then often a percentage is a better and more understandable approach. Of course, for a range, one can also use a floor and range concept.

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