Servo gear idle position measuring device and method

A servo gear idle position measuring method, comprising:

• outputting a start-up fixed force of a first rotation direction to an output shaft of a servo under test, and recording a value of a start-up position of the output shaft of the servo under test when a position of a rotor of the servo under test changes for the first time;
• outputting a counterrotation force of a second rotation direction contrary to the first rotation direction for rotating the output shaft of the servo under test to the output shaft of the servo under test, and recording a value of an counterrotation position of the output shaft of the servo under test when the rotor of the servo under test is in a stop status after a predetermined interval;
• and
• calculating a value of a servo gear idle position in a current measuring point, wherein the value of the idle position is the absolute value of the difference between the value of the start-up position and the value of the counterrotation position.