What does "Percent of Reading" uncertainty describe?

What does "Percent of Reading" uncertainty describe?

• A. A fixed value of measurement uncertainty
• B. The average deviation of measurements over time
• C. A percentage of the reading value reflecting measurement uncertainty
• D. A method to express uncertainties in absolute terms

Answer: (C)

"Percent of Reading" uncertainty describes a measurement uncertainty expressed as a percentage of the actual reading value. This means that the uncertainty is not a fixed value, but rather varies depending on the size of the measurement itself. For instance, if a measurement is taken at a certain value, the uncertainty will be calculated as a percentage of that value, making it scalable. This approach is particularly useful when the magnitude of the measured quantity can change significantly, allowing for a proportionate understanding of the uncertainty involved in the measurement. Other options suggest fixed values or methods to express uncertainties in absolute terms. However, these do not capture the dynamic nature of "Percent of Reading," which ties the uncertainty directly to the measurement’s size, ensuring the uncertainty remains relevant to the specific context of the reading.

"Percent of Reading" uncertainty describes a measurement uncertainty expressed as a percentage of the actual reading value. This means that the uncertainty is not a fixed value, but rather varies depending on the size of the measurement itself. For instance, if a measurement is taken at a certain value, the uncertainty will be calculated as a percentage of that value, making it scalable. This approach is particularly useful when the magnitude of the measured quantity can change significantly, allowing for a proportionate understanding of the uncertainty involved in the measurement.

Other options suggest fixed values or methods to express uncertainties in absolute terms. However, these do not capture the dynamic nature of "Percent of Reading," which ties the uncertainty directly to the measurement’s size, ensuring the uncertainty remains relevant to the specific context of the reading.