PeakTech 1295 Bedienungsanleitung Seite 160

(6) Turn the VOLTS/DIV knob, making the amplitudes of two signals equal in
the rough.
(7) Press the Acquire button to display menu in the bottom.
(8) Switch XY Mode as ON.
The oscilloscope will display the input and terminal characteristics of the
network in the Lissajous graph form.
(9) Turn the VOLTS/DIV and VERTICAL POSITION knobs, optimizing the
waveform.
(10) With the elliptical oscillogram method adopted, observe and calculate the
phase difference (see Bild 0-2).
Based on the expression sin (q) =A/B or C/D, thereinto, q is the phase
difference angle, and the definitions of A, B, C, and D are shown as the graph
above. As a result, the phase difference angle can be obtained, namely, q =±
arcsin (A/B) or ± arcsin (C/D). If the principal axis of the ellipse is in the I and
III quadrants, the determined phase difference angel should be in the I and IV
quadrants, that is, in the range of (0 ～π /2) or (3π / 2 ～2π). If the principal
axis of the ellipse is in the II and IV quadrants, the determined phase
difference angle is in the II and III quadrants, that is, within the range of (π /
2 ～π) or (π ～3π /2).
The signal must be
centered and kept in the
horizontal direction.
Figure 0-6 Lissajous Graph
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