Abstract: In the installation of a position measuring device it is necessary that parameters such as amplitude and phase position of the analog scanning signals as well as the position of the reference mark signal are tested. In order to accomplish such testing, a control device is provided that has a display field for visually indicating these parameters. A first bar is displayed in the display field and its width represents a measure for the fluctuation range of the radius and its position represents a measure for the average radius of a Lissajous figure. In addition, a marking is displayed for permissible fluctuation in range of this radius. Furthermore, a second bar is displayed in the display field, which indicates the position of the reference mark signal in relation to the analog signals generated by the scanner.

Abstract: A miniature electrically powered vehicle including an electric motor having a pair of permanent magnets mounted in the car to serve as the stator of the motor and also being mounted to extend in close magnetic proximity to the electric rails positioned in the track upon which the vehicle is operated. The magnets are mounted one behind the other in the vehicle such that a magnetic flux path exists running between one of the permanent magnets to at least one of the electric rails and then to the other of said permanent magnets. The resulting magnetic force between the car and the track provides an increased normal force of the car against the track to increase the traction of the driving wheels and to decrease slippage and prevent the vehicle from spinning as it negotiates curves in the track.