Tektronix WFM 601A, WFM 601E, WFM 601M - page 58

Reference
3–2 WFM 601A, WFM 601E & WFM 601M User Manual
Figure 3–2 depicts an input audio signal in which the X and Y channels are in
perfect phase and have equal amplitudes.
X
Y
=
=
Figure 3–2: X and Y signal in phase with equal amplitudes
Figure 3–3 depicts an input audio signal in which the X and Y channels are out
of phase by some amount but have equal amplitudes. The pattern is an ellipse
rather than an line, which indicates the signals are out of phase. The axis of the
ellipse lies terminates in the target boxes, which indicates that the amplitudes are
equal.
X
Y
=
=
Figure 3–3: Signals out of phase with equal amplitudes