For sale is a HP 75000 Series C Summing Amplifier / DAC E1446A Inputs 5V max Outputs +-20V Main +-3V Diff. 1-Slot, C-Size, Register-Based VXI Module Drive 50 Ohm Loads With 20 Vp-p Sum Two Input Signals Add DC Offset With Internal DAC Can Function as a Standalone Power DAC Can Act as Servant to the E1445A 1 PER BID!!!!