What must an operator do to avoid sweep errors when changing targeting points?

To avoid sweep errors when changing targeting points, it is essential for the operator to release the trigger of the laser device. This action is vital because it allows the laser to reset before targeting a new vehicle or object. When the trigger is continuously held down while shifting from one target to another, the system may inadvertently register multiple reflections or interactions, leading to inaccuracies in measured speed readings. By releasing the trigger, the operator ensures that the laser measurement begins fresh for the new target, thereby maintaining the integrity and accuracy of the data being recorded.

The other choices, while related to speed measurement techniques, do not specifically address the need to reset the system between targets and may introduce their own set of complications or inaccuracies in the measurement process.