关键词: 数控电位计, 非线性误差, ATE

Abstract: The non-linear error is an important index to reflect the accuracy of the digitally controlled potentiometer. For resistance and capacitance load exists between digital channel and analog channel in ATE test system, which can affect the measurement of nonlinear error accuracy of the digitally controlled potentiometer. This paper adds the high input impedance voltage follower between the sliding end of potentiometer and the analog channel of ATE. It can keep the output constant and keep open between the sliding end and the load, which can eliminate the influence of the load of ATE on the non-linear error, and realize the high accuracy test of the non-linear error of the digitally controlled potentiometer.

Key words: digitally controlled potentiometers;nonlinear error, ATE