The front panel contains high reliability encoders for both fine and coarse adjustment. The LED meters display both output voltage and current and are also used to preview and program the operating modes. Five push buttons are utilized for flexible user configuration. Internally, high resolution 16-bit Analog-to-Digital converters and Digital-to-Analog converters are used, which eliminates the need for the Z+ to be calibrated. The transition from constant voltage to constant current mode (and vice versa) is automatic. Up to six units can be paralleled for additional power, with the “master” control unit reporting and displaying the total system current for ease of use.