The SPM-3 is a broadband and heterodyne level meter whose frequency range is is designed for balanced 1 20 channel systems. It can be powered from a built-in rechargeable battery or from the mains.
The level meter can be supplemented with the level transmitter PS-3 to a voluminous level measuring station. The tuning of the two devices is done at the receiver SPM-3. For this purpose, the control oscillator voltage for the level transmitter must be connected to a corresponding socket on the front panel of the SPM-3. socket on the front panel of the SPM-3.
The SPM-3 is available in dB/dBm/volt versions. Here 0 dB = 0.775 V or 0 dBm = 1 mW at Z.