This is the time it takes for the servo to change from one position to another. In particular if you attempt to command a servo past its maximum or minimum rotation it will use the maximum amount of current trying unsuccessfully to achieve that position.ДЄnother parameter that varies from servo to servo is the slew rate. However, these are just guidelines and should be checked on the servos you use. Pulse will be about 1000 uS wide and the maximum pulse will be 2000uS wide. Different brands, and even different servos of the same brand, will have different maximum and minimums. The minimal width and the maximum width of pulse that will command the servo to turn to a valid position are functions of each servo. When the pulse is wider than 1500 uS the opposite occurs. the servo positions and holds its output shaft some number of degrees anti-clockwise from the neutral point. When the pulse sent to a servo is less than 1500 uS. In this state in can be pushed out of position and it will not return to the commanded position. When this timeout expires and there hasn't been another pulse the servoДe-energizes the motor. You can repeat the pulse more often than this, but not less often. Typical values for the command repetition rate are 20 - 30 mS. The maximum amount of time that can pass before the servo will stop holding its position is the command repetition rate. Servos will not hold their position forever though, the position pulse must be repeated to instruct the servo to stay in position. Typically this is about the equivalent of 1kg at 1 inch away The maximum amount of force the servo can Thus, if a servo is commanded to the neutral position and an external force is present to push against the servo (presumably through the mechanical linkage) the servo will actively resist being moved out of that position. These servos are 'active' devices, meaning that when commanded to move they will actively hold their position. It is important to note that different R/C servos will have different constraints on their rotation but they _all_ have a neutral position, and that position is always around 1500 uS. Given the rotation constraints of the servo, neutral is defined to be the position where the servo has exactly the sameДЄmount of potential rotation in the counter clockwise direction as it does in the clockwise direction. The convention is that a pulse of approximately 1500 uS (1.5 mS) is the 'neutral' point for the servo. These values are not 'standard' but there are conventions that are generally accepted. The parameters for this pulse are that it has a minimum width, a maximum width, and a repetition rate. Servos are controlled by sending them a 'pulse' of variable width. In an R/C model, this line it attached to the radio receiver, on robots it is usually attached to the processor. The control line is used to position the servo. These servos typically run on 4.8v (four NiCd batteries) but they often work with voltages between 4 and 6 volts. The three wires are V+, Control, and Ground. This is a plastic piece with holes in it forДЄttaching push rods or other mechanical linkages to the servo. Attached to the motor shaft is usually (but not always) a 'control horn'. A typical hobbyist servo looks like a rectangular box with a motor shaft coming out of one end and a connector with three wires out of the other end. Generally there is a circuit that allows the motor to be commanded to go to a specified 'position'. A servo is a motor that is attached to a position feedback device.

Servo controller circuit