The PLH series achieves an exceptional power density for a linear regulated power supply offering up to 90 watts from a ¼ rack 3U sized casing. For rack-mount application, up to four units can be mounted into a single slot. Linear regulation offers the lowest output noise and the best transient response. PLH provide high output voltages and maintains output noise figures of below 2mV, and transient recovery times of better than 250µs. The lack of a high frequency switching circuit reduces radiated noise and common mode signals enabling the PLH series to be used in sensitive environments. The PL series introduces S-Lock. This offers complete security and exceptional stability with each setting controlled by an instrumentation quality DAC V-Span function of the PL series allows the user to redefine the end-stop values of the voltage control to define a specific voltage range. Digital Remote Control interfaces. USB and LAN / LXI, RS-232 , GPIB interface . Free down load software Test Bridge PSU control and logging software.