The SPE 120.3 is a three-phase computer controlled voltage and current source, designed for used in meter test systems and in the laboratory. It is in two performance steps with 300 VA and 600 VA output power available. The models are housed within a 19”-plug-in unit, 6 or 9 height modules, depending on output power.
 
The SPE 120.3 creates a three-phase network, using a base of electronically generated sine waves. The network is completely independent of the supply voltage, and the use of a voltage stabiliser at the entry point is not necessary. The amplifiers are of pulse-width modulation type. The SPE 120.3 is controlled by a PC via RS232C serial standard interface.
 
To complete the power source an STE 10 control unit having the following functions is necessary: on-off switch, emergence stop switch, surveillance of the mains power supply and protection against short circuits between U and I in the output circuits.  
 
When only the SPE 120.3 rack is required customers will need to provide these functions. In the test station version, the SPE 120.3 will be delivered with further components, e.g. control unit, reference meter, etc. completely wired in a cabinet.