A microcomputer controlled spherical resonator apparatus has been developed for acoustic studies of liquids at 5–500 kHz. A programmable frequency synthesizer producing frequencies in steps down to 1 μHz is used as the source. The received signal is fed into a programmable tuned amplifier, and demodulated. A/D conversion is made with a high‐speed sample‐and‐hold digital voltmeter via a multiplexing scanner. The system allows for very detailed mode mapping of the sphere by accumulating amplitude data both while the sphere is being driven and after a specified decay time interval, along with recording of temperature. The experimental resonance frequencies have been compared with those predicted theoretically and decay rates of a large number of resonances measured. The amplitude decay can be followed through 70 dB with reproducibility within ±0.2 dB s−1 under favorable conditions. The system is also used for cylindrical resonators. [Research supported by ONR—Physics Program.]