I have a specific question about the phase trace in Smaart. Lots of reading and a Smaart training seminar with Jamie have given me a pretty good understanding of how to read it, but one aspect has puzzled me for a while now.
Feeding identical signals to both of Smaart’s inputs gives you a horizontal trace at 0 degrees on the graph. This logically tells you that the two signals are aligned in time at all frequencies. Makes sense.
If I understand correctly, the following points are true when looking at the phase of the pass band of a driver (the typical smile-shaped trace).
1 – Where the trace is roughly horizontal (the bottom of the smile) the two signals are aligned with each other as described above.
2 – Where the trace is angled downward from left to right, the measurement signal is lagging behind the reference signal.
3 – Where the trace is angled upward from left to right, the measurement signal is leading the reference signal.
Okay…now what does it mean when you have a horizontal portion of the trace (the bottom of the smile described above) that does not fall at 0 degrees on the graph? How does the graph’s degree scale relate to the trace? Does it mean anything at all for a single reading, or is it just there so you can compare the relative positions of two separate traces? If I understand correctly, you can’t compare phase angles for different frequencies anyway. Someone please enlighten me!