Hach DR 5000 用户手册

Select Mark to mark the next data point collected. This mark is 
not used by the instrument, but is available for the user and 
may indicate a significant event, such as the addition of a 
sample or other reagent. The mark is also shown in the table.

Select Stop to stop taking sample readings.

After the data are collected, the following manipulations can be 
done on the graphic data:

The Time Course Program is complete, if 

the sound is turned on, the instrument beeps when the 
readings are done

the graph is shown fullsize,

the scaling of the x-axis occurs automatically,

the Cursor functions in the vertical navigation bar are 
highlighted.