Each sensor has an associated column where that sensor's data is
displayed. Live readouts are values that are taken approximately
5 times a second (if you are collecting at a slower rate, the live
readouts will be updated at the same frequency as the collection) and
displayed with each sensor's column name in the
second row of the toolbar next to the icon for the interface that the
sensor is attached to.
Live readouts for calculated columns
that are based on sensor columns are also displayed here. You can
turn live readouts on or off for any sensor column or calculated column
that depends on a sensor column via a checkbox in the column
options dialog.
The motion detector makes a distracting noise when taking its reading,
so by default its sensor column (Position) and calculated columns
(Velocity, Acceleration) have live readouts turned off.
Sensors will only report their state at the instant the live readout is
taken. Intermediate values will not be displayed.
Calculated columns that depend on more than one point for their display
(e.g. Velocity) will not report live readouts since a live readout is
by definition a single value. However, while you are doing a data
collection the live readout display will show the most recently
collected point, and thus this type calculated column will show a value.
You can turn live readouts on or off from the Experiment menu.
While live readouts are on, the application automatically
polls each device to see if sensors have been added or
removed. When it detects that a sensor has been removed, the
application will delete the associated sensor column unless that column
has data in it. When the application detects that a sensor has
been added, it will add the appropriate sensor column. If you do
not like this sensor polling, you can prevent it by turning live
readouts off.