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Automatic calibration denotes a system of computer-controlled self-calibrating electrical measurements. Its purpose is to minimize the calibration support required for electrical measurements in maintenance or check-out applications. The system utilizes techniques whereby all electrical measurements are automatically reduced to and expressed in terms of several basic standards. Measurement data are transmitted to a digital computer for computation of the value of the unknown parameter. Automatic self-calibration procedures are carried out just before unknown inputs are measured. Development of instrumentation known as the automatic calibration program, laboratory evaluation unit has been accomplished. This unit automatically measures and calibrates a wide range of the most common dc and low-frequency electrical parameters. Only three single valued, certified standards are included: a 1-V cell, a 1-Â¿ resistor, and a 1-MHz oscillator.