Tdk lambda variable programmable power supplies z series tdk lambda z 20 40 the tdk lambda z20 40 800w is a z high density 2u format bench top and rack mountable power supply the z20 40 has been designed to meet the demands of a wide variety of ate laboratory and oem applications including test and measurement semiconductor burn in component test ledlaser test rf amplifiers electromagnetic and electrochemical this z model can provide an output voltage from 0 to 20v dc and an o