Agreed maximum magnitudes for positive or negative deviations on the indication (output) from measuring devices.
Error limits are pre-defined essentially in relation to systematic deviations from the correct or agreed value of the measured variable. They are also not allowed to be exceeded by random deviations (DIN 1319).
On digital measuring instruments the quantisation error F Q caused by the digital measuring step must also be stated.
The worst case total error limit of a measuring device is obtained from the algebraic sum of the individual error limits (Figure F 4).
On instruments that must be calibrated, a differentiation is made between the calibration error limit, which states the largest permissible error in the new state, and the in-service error limit that is not allowed to be exceeded also during continuous usage (VDI 2600).
Figure F 4: Error limit on a pressure measurement device