This talk will describe techniques used to measure performance parameters of both analog and digital audio equipment. Particular attention will be given to methods that are also appropriate to acoustic measurements, such as the use of maximum-length sequences (MLS) for pseudo-anechoic frequency response determination. In addition, measurement modes unique to Audio Precision's test equipment will be described. The aim of the talk is to introduce an acoustically-minded audience to the methods used to characterize familiar equipment such as amplifiers, CD players, effects processors, and loudspeakers.