Each trace in the following image contains all twenty PT() mV/V values (left axis) for a given
record number and an average value showing the measurements as percent of final reading
(right axis). The reading has settled to 99.5% of the final value by the fourteenth measurement,
which is contained in variable PT(14). This is suitable accuracy for the application, so a settling
time of 1400 µs is determined to be adequate.
22.11.6 Factors affecting accuracy
Accuracy describes the difference between a measurement and the true value. Many factors
affect accuracy. This topic discusses the effect percent-of-reading, offset, and resolution have on
the accuracy of an analog voltage measurement. Accuracy is defined as follows:
accuracy = percent-of-reading + offset
where percents-of-reading and offsets are displayed in the Analog measurement specifications
(p. 243).
NOTE:
Error discussed in this section and error-related specifications of the data logger do not
include error introduced by the sensor, or by the transmission of the sensor signal to the data
logger.
22. Tips and troubleshooting198
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