A power supply device for a test equipment, test equipment having a power supply device and a method for operating a power supply device are described. The power supply device is configured for an at least partly capacitive load and has an output voltage provider configured to generate a target voltage, which is energized by an input supply voltage provided at an input of the power supply, wherein the target voltage generates an output supply voltage at the capacitive load, when the capacitive load is connected to an output of the power supply and a supply current monitor configured to monitor supply current flowing into the input of the power supply and to temporarily reduce the target voltage generating the output supply voltage, if a current value of the supply current exceeds a first predetermined threshold.