302 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 10 Operate the Module
Measurement Accuracy
Consider the following items relative to measurement accuracy:
•Absolute Error
Absolute error quantifies the average of the measurements that are
compared to the expected result. The measurement error, for both AC
and DC measurements, is less than ± 0.5%.
•Measurement Output Variation
Output variation describes how individual measurements of the same
input deviate from the average. For a given configuration, the modules
output variation is related to the signal amplitude. Small AC signals
experience the highest percentage deviations, example: 0.7% for signals
less than 100 mV p2p typically reducing to 0.2% or less for AC signals of
several volts and all DC measurements.
• Overall Accuracy
Overall measurement accuracy is the combination of the absolute
measurement error and measurement deviation, so it varies depending
on actual signal levels. Nevertheless, it is reasonable to expect a typical
overall measurement accuracy of not less than ± 1.0% of the typical
range or alarm limit.
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