This 4 channel unit can accept a full scale input of +10 VDC on each channel, individually selectable in 4 ranges. It also has a program-controlled reverse channel for driving small signal lamps, relays or TTL circuits. An HP-IB controller can command this unit to perform a single conversion or initiate a series of internally paced conversions at one each of 6 selectable rates (up to 100/s on one channel; up to 50/s on each of 4 channels).