DC Source 20V / 5A, HPIB and RS-232. The 66332A DC Source is the only system DC power supply that provides dynamic measurement and analysis of voltage and current waveforms. This product is ideal for testing digital wireless communications products because it not only provides the power for testing, but also performs the peak current measurements required to characterize the pulsed current demands of these products. The unit is rated 0 to 20 V @ 5 A.