Turns ON/OFF the averaging trigger function. The function
executes a sweep the number of times specified by the averaging
factor with a single trigger for the channels with the averaging
enabled.
The averaging process begins again with each trigger.
Note: The point trigger function has priority against this command.
When the point trigger is enabled the number of pulses equal to
(number of points) x (averaging factor) is needed to complete the
averaging.
(command/query)