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EZ Digital OS-3060D Especificações Página 73

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2-3-4. Phase Difference Measurements
Phase difference in phase angle between signals can be measured using
the dualtrace method
of
pha
se measurement or Lissajous diagrammatic
method of phase measurem
ent
in the X-Y mode of the oscilloscope.
(J)
Dual-trace Method
Thi
s method works with
an
y type of waveform. Even if the waveforms are
different from each other or the
pha
se difference is great, the
measurement up to 20MHz is practicable.
Measurement shall comply with the following:
1. Set the switches as described in 2-2-4
Dual-trace
Measurement.
Connect one signal to the CH
I IN connector
191
and another one to
the CH2 IN connector 110]
NOTE : Where the frequency is bec
omin
g higher, usc the same probe or
the cable having an equal delay time so that an measurement
error can be reduced.
2. Position the Trigger SOURCE switch 12
81
toward the stable waveform.
At this time, move
another
waveform upward or downward by adjusting
the vertical
POSmON
control so as to make the said waveform
invisible.
3. Move the waveform to the center adjusting the vertical POSITION
control,
and
make the waveform occupy 6 divisions.
4. Adjust the Trigger LEVEL control130J and ensure that the beginning
point
of
the wav
ef
orm corresponds exactly to the starting point of
the horiz
ont
al graticule line (See Fig. 2-19).
5. Adjust the TIME/DIV switch 122JTIM E VARIABL E control
125]
, and the
horizontal POSITION control 126] properly so as to make one cycle of
the wavef
orm
become 7.2 divsions.
When
this is done, each major
horizontal division represents 50°
and
each subdivision represents
10°.
6. Perf
orm
the same procedure as that described in Item 3 above so as
to have another
waveform already moved to be invisible also
displayed on center
of
the horizontal graticule line.
7.
The
horizontal distance between the beginning points on the
horizontal axis
of
two waveforms is the phase difference.
For
example, the phase difference shown in Fig. 2-10 is 5.2
divisions, hence 60°
73
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