TESTING DEVICE OF ARM BLOCK

PURPOSE:To realize a device which displays whether each test part is defective or not, by applying a test signal having a purpose to the coil of each test part and discriminating whether the output from each magnetic sensor is a desired value or not by comparison. CONSTITUTION:A test signal can be applied to a coil 16 of an arm stretcher 31 from a variable frequency signal generating circuit 40 through a switch 41 for the purpose of testing its frequency response. The output signal frequency of this variable frequency signal generating circuit 40 is varied on a basis of data from a control circuit 38 by the generation of a frequency control signal FCS in a digital-analog converting circuit 39. Meanwhile, the output of a Hall element 34 for detecting the frequency response of the arm stretcher 31 is inputted to a gain detecting circuit 42. Each time the signal frequency applied to the coil 16 is changed, the gain detecting circuit 42 detects the peak of the output of the Hall element 34, and this detected level and a preliminarily set ideal level are compared with each other.