EINRICHTUNG FUER AMPLITUDENMESSUNGEN

1. Apparatus for taking measurements of amplitudes with a housing (1) in which a spring-mounted measuring rod (2) terminating with a measuring attachment (3) is mounted so as to be capable of axial movement, characterised in that the measuring rod (2) is designed as a piston (4) acted upon by a restoring spring (6) arranged in the housing (1) and acting in the axial direction, in that there is rigidly secured in the piston (4) a transmitter (5) terminating in the measuring attachment (3) which is axially moveable relative to the piston (4), in that there is provided in the housing (1) a duct (8) extending at an acute angle to the piston axis, in which there is arranged a fixing element (7), designed as a rotary body, which is pressed in a fixing position against the side surface of the piston and the wall of the duct (8) by the action of a spring (12) provided in the duct (8), wherein the duct (8) and the fixing element (7) are arranged such that the fixing element (7) is pushed out of the fixing position when the piston (4) moves towards the restoring spring (6) and is pressed into the fixing position when the piston (4) moves away from the restoring spring (6), and the duct (8) is connected to an opening (9) formed in the housing (1) in which there is provided a spring-mounted, axially displacable disconnection switch (10), the tip of which is located at a distance (delta) away from the fixing element (7) and which is arranged and designed such that when it is actuated, the fixing element (7) is pressed out of the fixing position.