Active Measurement
You can have several measurements in a window (called measurement group as described above). One of these measurements is called the active measurement. When performing or inserting a new measurement, this will become the active measurement.
The active measurement is used in several ways
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File->Save Active Measurement As.… will save the active measurement
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Measurement->Measurement Information... will display information about the active measurement.
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If auto-refresh is enabled in “active measurement” mode (Plot->Auto Refresh is set as shown in the figure below,
the curve belonging to the active measurement will be refreshed when changes in the plot settings are made.