DPO6000
，
MPO6000 Series Digital Phosphor Oscilloscope Instruction V1.1
- 28 -
deviation angle obtained should be within quadrant II and III, namely within (π/2 to π) or
(π to 3π/2). The XY function can be used to measure the phase deviation occurred when
the signal under test passes through a circuit network. Connect the oscilloscope to the
circuit to monitor the input and output signals of the circuit.
Note
:
When XY mode is enabled, "
Sweep
" will be disabled automatically.
In XY mode,the oscilloscopes will select channels group automatically,CH1-CH2 or
CH3-CH4.
The following functions are not available in XY mode:
"Delayed Sweep", "Vectors", "Protocol Decoding", "Acquisition Mode","Pass/Fail Test",
"Digital Channel" and "To Set the Persistence Time" all don’t work.
4.1.2.1.XY single-window display mode
Application example
: measure the phase deviation of the input signals of two channels.
1.
Connect a sine signal to CH1 and then connect a sine signal with the same frequency
and amplitude but a 90° phase deviation to CH2.
2.
Press
Auto Scale
and then adjust the vertical positions of CH1 and CH2 to 0 V.
3.
Set the time base mode to XY. Rotate
Horizontal SCALE
to adjust the sample rate
properly to get better Lissajous figure for better observation and measurement.
4.
Rotate
VERTICAL SCALE
of CH1 and CH2 to make the signals easy to observe. At
this point, the circle as shown in the figure below should be displayed.
5.Observe the measurement result shown in the figure above. According to the
measurement schematic diagram of the phase deviation, A/B (C/D) = 1. Thus, the phase
deviation angle
=
arcsin1=90°.
