Meteorological Instrument Performance Characteristics

Instrument Performance Characteristics » Static Calibration » Calibration Errors

A calibration curve showing the measured value (output) versus the input value can be constructed. Differences from the identity line indicate systematic error, which can have many forms. An example of systematic error is a consistent offset, indicating the need to adjust the zero offset of the instrument. This type of zero error is shown in the figure below. A span error, where the error depends on the value of the measurement, is also shown.

example of a zero error.

Graph showing example of a zero error. Image from R. Clark.

Generalized illustration of the characteristics of a a span error (right). Span error is corrected by calibration of the static sensitivity.

Graph showing example of span errors. Image from R. Clark.