Beckhoff EPP3504-0023 Short Manual page 57

Basic accuracy, extended basic accuracy, and averaging
ü The basic accuracy will be designated separately to simplify usage.
a) The basic accuracy includes the offset/gain deviation, non-linearity and repeatability, but not the
temperature coefficient nor the noise and is thereby a subset of the aforementioned complete
calculation. It is possible to increase the measurement accuracy beyond the basic accuracy by
means of the offset correction.
Note: the "extended basic accuracy" also includes the temperature behavior across the specified
operating temperature range, e.g. 0...60°C, via the temperature coefficient.
b) "Averaging" means that the value has been obtained from the arithmetic average of 100,000
(usually) values to eliminate noise. The averaging function integrated into the box module does
not necessarily need to be used. If resources are available, averaging can also be executed
within the PLC.
Measurement accuracy of the measured value (from reading)
In several cases, the "Accuracy based on the up-to-date measured value" (percentage of reading),
i.e. "Accuracy of value", is sought instead of the "Accuracy related to the full scale value (FSV)"
(percentage of range).
This value could easily be calculated from the data given by the specification, as the total accuracy
consists of a measured value and full scale value dependent component and an exclusively full
scale value dependent component, according to the formula:
EPP3504-0023 Version: 1.2
Product overview
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