The 59501B Power Supply Programmer is an isolated digital-to-analog converter designed to provide an interface between HP-IB and HP power supplies. Output mode is unipolar 0 to 9.99 V (low range 0 to 9.999V), Bipolar -10 to +9.98 V (low range -1 to +0.998V). DC output current 10 mA maximum. Resolution unipolar 10 mV (low range 1 mV), bipolar 20 mV (low range 2 mV).