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Using Designer, it is possible to only log a measurement when it changes value.
The following modules are needed:
Data Recorder Module
The Arithmetic module will compare the current value of the measurement to the last value. When the different between those two values is anything other than 0, the output of the arithmetic module will be 1. The convert module will see the change from 0 to 1 and pulse out to the record input of the Data Recorder Module. The value being compared will be the source of both the Arithmetic Module and the Data Recorder Module.
Input of the Arithmetic Module
Formulas used in the Arithmetic Module
Input of the Convert Module
Input of the Data Recorder Module