Features Extended Current. WK Series models have maximum current ratings that are equivalent to a 600W supply. These currents are available for all voltages up to 84% of rated output voltage. Above this point, current is derated to maintain a constant 500W maximum output. Pulse-Width Modulation. Off-the-line pulse-width modulation provides high efficiency and a reduced parts count for improved reliability. Constant Voltage/Constant Current Operation. Automatic crossover from voltage to current regulation is used to provide protection from overloads, arcs, and short circuits. Low Ripple. Ripple is less than 0.1% of rated voltage at full load. Tight Regulation. Voltage regulation is better than 0.005%, line or load, and current regulation is better than 0.1% from short circuit to rated voltage. Front Panel Controls (Analog and Digital Versions.) Separate 10-turn controls with locking vernier dials are used to set voltage and current levels. A high voltage enable switch and an AC power on/off switch complete the panel controls. L.E.D.'s indicate when high voltage is on, the output polarity, and whether the supply is operating in a voltage or current regulating mode. For the blank panel version, only a power on/off switch is provided. Air insulated. For improved serviceability and decreased weight. Small Size and Weight. WK Series power supplies consume only 5.25 inches of panel height. Weight is 30 pounds typical. Warranty. Standard power supplies are warranted for three years; OEM and modified power supplies are warranted for one year. A formal warranty statement is available.