HP 54645A, User'S And Service Manual

Page: 155 / 301

To use the XY display mode
The XY display mode converts the oscilloscope from a volts-versus-time
display to a volts-versus-volts display. You can use various transducers so
the display could show strain versus displacement, flow versus pressure, volts
versus current, or voltage versus frequency. This exercise shows a common
use of the XY display mode by measuring the phase shift between two signals
of the same frequency with the Lissajous method.
1
Connect a signal to channel 1, and a signal of the same frequency but
out of phase to channel 2.
2
Press
Autoscale
, press
Main/Delayed
, then press the XY
softkey.
3
Center the signal on the display with the Vertical Position
(HP 54645A) or Analog Position (HP 54645D) knobs, and use the
Volts/Div knobs and the vertical
Vernier
softkeys to expand the signal
for convenient viewing.
sin
θ
=
A
B
or
C
D
Example of Centering a Signal on the Display
Figure 5-8
Making Measurements with HP 54645A/D Oscilloscopes
To use the XY display mode
5-14