Calibration refers to the process of setting the magnitude of the output of a measuring instrument to the magnitude of the input, within specified accuracy and precision
Calibration of analog amplifiers is performed by applying a minimum of two known input conditions, and then making adjustments to the gain and offset controls until the required output is obtained.
Due to the tendency for interaction between the gain and offset controls of pure analog amplifiers, the calibration process may need to be repeated several times to achieve the required precision.
The calibration of digital amplifiers (or indicators or controllers) is simplified by the fact that the gain and offset controls are applied in software, and therefore do not have any interaction with one another.
A further benefit that is often available on newer designs is the ability to calibrate by direct entry of known calibration parameters, such as can be found on the transducer manufacturer's calibration certificates. This simplifies the process because actual inputs do not need to be applied or simulated.
The implementation of TEDS involves the placing of a miniature EEPROM chip inside the sensor (or inside the connector). Then, during calibration, the relevant data is written to the TEDS chip and any TEDS enabled indicator can then self-calibrate upon start up, by reading the TEDS data.
The IEEE 1451.4 standard defines TEDS as a truly plug and play sensor environment. Mantracourt supports TEDS on several products, including the model PSD hand held display.