Power supply for single application in the usb port of a pc or for modular application in a device chassis has voltage and electricity programmingreadback with a high measurement sensitivity of 100 pa with a resolution of 16 bit the device is able to work in four quadrant mode and therefore serves as a power source and electrical load with positive and negative polarity in the voltage output in addition to the standard device u2722a the u2723a offers a faster response time reaction time a