Tektronix programmable dc power supply pws4000 series tektronix pws4721 the tektronix pws4721 is a programmable dc power supply that has a wide current and voltage range and flexible features making it a versatile addition to your workbenchthe pws4721 has a basic voltage accuracy of 003 and a basic current accuracy of 005 so you can be confident in the output value remote sense capability to eliminate the effect of voltage drop in your lead wires and noise of less than 3mvp p furthe