Cursors Set to Center of Signal
6
Move the Y1 and Y2 cursors to the center of the signal.
Again, note the
∆
Y value.
7
Calculate the phase difference using the formula below.
sin
θ
=
second
∆
Y
first
∆
Y
=
111.9
244.4
=
27.25 degrees of phase shift.
XY Display Mode Operating Hint
When you select the XY display mode, the time base is turned off. Channel 1 is
the X-axis input, channel 2 is the Y-axis input, and the external trigger in the
HP 54645A is the Z-axis input. If you only want to see portions of the Y versus X
display, use the Z-axis input. Z-axis turns on and off the trace (analog
oscilloscopes called this Z-blanking because it turned the beam on and off).
When Z is low (<1.4 V), Y versus X is displayed; when Z is high (>1.4 V), the trace
is turned off.
Figure 5-11
Making Measurements with HP 54645A/D Oscilloscopes
To use the XY display mode
5-16
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