Abstract: Disclosed herein is a method of detecting relative vibration between an AUT and a probe during any type of near-field testing. The method also provides the means to measure and compensate for any data inaccuracies/errors created by relative vibration while requiring no additional hardware other than that normally utilized in conducting a near-field test. In contrast to the standard process of collecting data only at a series of discrete points, data is collected regularly as the probe moves with a constant velocity across its measurement plane or virtual surface. Due to the constant collection of data, each principle data point is accompanied by a series of leading and trailing secondary data points. While the principle data points are, as in a standard near-field test, transformed by a computer to determine the AUT's far-field pattern (or to identify malfunctioning antenna elements), analysis of the secondary data points reveals any relative vibration between the AUT and the probe.