Data Precision Model 3400DMM is a local-or remote-programmable 4-1/2 digit digital multimeter, providing up to 12 conversion measurements per second with high accuracy performance. It incorporates Data Precision's Tri-Phasic"^ A/D Conversion, Isopolar^ referencing, and 2- or 4-wire Ratiohmic resistance measurements, as well as auto-zero circuitry that compensates for instrument drift before each and every conversion. Each Model 3400DMM includes all interface signals for remote programming of range (selected range or auto-range) and mode of signal measurement (DCV, ACV, k i2, or Voltage Ratio), for external trigger control or holding function, and for BCD-formatted output data. All output data signals, as well as conversion status (for remote recording or display) are available as DTL/TTL compatible voltage levels. Complete measurement and control instrumentation is provided as part of the standard Model 3400DMM equipment.