Functionality of the LEP tune meters with 3rd generation DSPs

The LEP tune meters have been upgraded by replacing the original Motorola 68020 processor cards by Texas Instruments TSM320C30 Digital Signal Processor cards with floating point arithmetic and by creating an optional connection to a more sensitive beam position monitor. This upgrade has lead to a considerable increase in speed and accuracy. The new instrument can generate a continuous real time display of the beam motion in the frequency domain which is well suited to monitor dynamic phenomena occurring during injection and acceleration of the LEP collider. The dynamic phenomena can also be stored for off line analysis. The paper describes the functionality of the instrument in terms of user interface and covers some aspects of code debugging and process synchronization for DSP's connected to the standard control system of an accelerator.