TABLE OF CONTENTS All transducers, irrespective of their measurement requirements, exhibit the same characteristics such as range, span, etc. This section explains and demonstrates the interpretation of the most common of these characteristics.
The very first, and most common term a ccuracy is also the most misused and least understood.
It is nearly always quoted as this instrument is X% accurate , when in fact it should be stated as this instrument is X% inaccurate . In general, accuracy can be best described as how close the measurement's indication is to the absolute or real value of the process variable. In order to obtain a clear understanding of this term, and all of the other ones that are associated with it, the term error should first be defined.
Error means a mistake or transgression, and is the difference between a perfect measurement and what was actually measured at any point, time and direction of process movement in the process measuring range. There are two types of accuracy, static or steady-state accuracy and dynamic accuracy.
Static accuracy is the closeness of approach to the true value of the variable when that true value is constant.
Dynamic accuracy is the closeness of approach of the measurement when the true value is changing, remembering that a measurement lag occurs here, that is to say, by the time the measurement reading has been acted...
