Audio Analyzer Measurement Functions 5Keysight U8903A User’s Guide 125The figure below shows the DFD measurement.Figure 5-13 DFD measurementPhasePhase measurements are used to describe the positive or negative time offset in aperiodic waveform cycle (such as a sine waveform), measured from a referencewaveform. The reference is usually the same signal at a different point in thesystem, or a related signal in a different channel of the system. Phase is expressedin degrees (°).Phase shift varies with frequency, and therefore, it is common to make phasemeasurements at several frequencies or to plot the phase response of a frequencysweep.There are generally two types of phase measurements as follows.– interchannel phase delay– device phase response
