The TM 620.20 system for data acquisition, as an accessory for the TM 620 and TM 625 experimental units, enables vibrations to be recorded and analysed. The system consists of two inductive displacement sensors, a measuring amplifier and software for further processing and displaying the measured values.
The two displacement sensors take contactless measurements of the deflection of the rotating mass disks on the elastic shaft of TM 620 or TM 625. The relative position of the two displacement sensors can be varied. By arranging the displacement sensors at right angles to each other (90° offset) in the measuring plane, the movement of the shaft can be represented over one whole revolution as an orbit.
With an arrangement with two different mass disks, it is possible to measure the natural mode of the vibrating shaft. The analogue signal of the displacement sensors is digitised in the measuring amplifier and sent to a PC via USB. The GUNT software provided allows the signals to be displayed optionally as either a time series on the oscilloscope or amplitude as a function of speed.
The displacement sensors are powered by the measuring amplifier. All necessary cable connectors are included. The experiments are described in the instruction material of the TM 620 or TM 625 unit.