Abstract: The invention provides an electronic gage amplifier which converts sinusoidal signals representing measurement data from a gage head into a visual display of measurement data. The measurement signals are received by the amplifier at the input of a mixer where they are combined with a coarse adjustment signal. The coarse adjustment signal, which is provided by a multiplying digital-to-analog converter (MDAC) which is controlled by a microcomputer, yields a fine adjustment signal when mixed with the measurement signal. The resulting fine adjustment signal is amplified by a preamplifier, translated into a steady-state voltage by a programmable-gain demodulate-and-hold circuit (D/H) and converted to a digital word by an analog-to-digital converter (ADC). The microcomputer further causes a known reference signal to be processed through the MDAC, mixer, preamplifier, D/H, and ADC.