A 0 to -50V DC variable offset may be applied to the output. The offset is connected through a 1 kilohm resistance, limiting the maximum offset current to 50 mA. This is provided to bias a laser diode just below threshold, if desired. The AVOZ-F2-B is similar, except that it is designed to drive a high impedance load of 2 Ohms. The maximum output current is -90 Amps.