1.1.0 GENERAL DESCRIPTION 1.1.1 The Model CR103 is a versatile combination of a high accuracy DC current source, a high accuracy DC Voltage source and calibrator, combined in one instrument. 1.1.2 The unit is laboratory calibrated against a primary measuring system, having an absolute error of less than lOppm. The saturated standard cells used are certified, and are traceable to the National Bureau of Standards, having a long history of documented Stability. 1.1.3 Current and voltage calibrator controls are obtained through front panel rotary and decade switches. No trims of adjustments required between Calibration Cycles. Adjustment settings are made at final calibration and are fully described under calibration procedures. 1.1.4 The circuitry is completely solid state packaged in discrete, hybrid and integrated circuit modules. These are proven circuits, using derated components to insure maximum reliability. Major discrete circuits are packaged on etched glass epoxy boards, so that the instrument can withstand abnormal environmental conditions. The instrument is also overload and short circuit protected.