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The accurate tune determination is essential for the stable operation of storage rings. The Beam Motion Monitor (BMM), developed at HZB, permits the permanent measurement of betatron tunes at the BESSY storage ring without exciting the beam. With this system it is possible to detect the transverse beam oscillations of less than 1nm [rms]. The large dynamic range of more than 120 dB for observing the beam motion, the fast update rates (10 Hz) of the wide spectrum (DC to f rev) allows to use this system for beam dynamics studies and for detecting beam instabilities. The big advantage of the BMM is that it operates without switching and adjusting the system for different currents and fill patterns in the storage ring. Only two stripline signals installed in the storage ring are needed as input for BMM. The high sensitivity of the monitor is based on the suppression of the common mode by carefully adjusting the difference of the two input signals. All components for this system are available on the market.
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