1.6 Performance characteristics - Static

Static Characteristics can be divided into several types and some of items that will be discussed are as follows:

1) Accuracy

2) Precision

3) Resolution

4) Sensitivity

5) Expected Value

6) Error

Accuracy

Accuracy: the degree of exactness (closeness) of measurement compared to the expected (desired) value. Or closeness of the instrument output to the true value of the measuring quantity (as per standards)
Relative accuracy, 𝑨 = 1 −[ 𝑌𝑛 − 𝑋𝑛/ 𝑌𝑛 ]
% 𝑨𝒄𝒄𝒖𝒓𝒂𝒄𝒚, 𝒂 = 100% − % 𝑒𝑟𝑟𝑜𝑟 = 𝐴 × 100
Where- 𝑌𝑛: expected value; 𝑋𝑛: measured

Precision

Precision – a measure of consistency or repeatability of measurement, i.e. successive reading do not differ.
Precision,P =1- Xn-Xn/Xn
Where ;
𝑋𝑛: value of the nth measurement;
𝑋𝑛: average set of measurement

3) Resolution – the smallest change (or interval) in a measurement variable to which an
instrument will respond.

4) Sensitivity – ratio of change in the output (response) of instrument to a change of
input or measured variable.

5) Expected value – the design value or the most probable value that expect to obtain.

6) Error – the deviation of the true value from the desired value.