UTD2000M
User
Manual
Fig.
3
‐
9
X
‐
Y
Schematic
Diagram
Based
on
sin
θ
=A/B
or
C/D,
among
which,
θ
is
the
angle
of
phase
difference
between
channels.
See
above
graphic
for
the
definition
of
A,
B,
C
and
D.
Hence
we
can
conclude
that
the
angle
of
phase
difference,
θ
=
±
arcsin
（
A/B
）
or
θ
=
±
arcsin
（
C/D
）
.
If
the
principal
axis
of
the
ellipse
is
within
quadrant
I
or
III,
then
the
angle
of
phase
difference
obtained
should
be
within
quadrant
I
or
IV,
that
is
within
0~
π
/2
or
3
π
/2~2
π
.
If
the
principal
axis
of
the
ellipse
is
within
quadrant
II
or
IV,
then
the
angle
of
phase
difference
obtained
should
be
within
quadrant
II
or
III,
that
is
within
π
/2~
π
or
π
~3
π
/2.
In
addition,
if
either
the
frequency
or
phase
difference
of
the
two
signals
under
test
is
in
integral
multiple,
the
frequency
and
phase
relation
of
the
two
signals
can
then
be
calculated
based
on
the
graphic.
X
‐
Y
Phase
Difference
Table
Signal
‐
Frequency
Ratio
Phase
Difference
0
°
45
°
90
°
180
°
270
°
360
°
1
：
1
3.6
Example
of
Video
Triggering
Observe
a
video
circuit
and
apply
video
triggering
to
acquire
stable
display
of
video
output
signal.
Video
Field
Trigger
To
do
video
field
trigger,
please
follow
the
following
steps
to
operate:
1
．
Press
MENU
key
located
in
the
trigger
control
area
to
display
trigger
menu;
2
．
Press
F1
key
and
then
use
“MULTIPURPOSE”
knob
to
set
trigger
type
as
“Video”;
3
．
Press
F2
key
and
then
use
“MULTIPURPOSE”
knob
to
set
trigger
source
as
“CH1”;
4
．
Press
F5
to
enter
into
Video
Setting.
Press
F1
to
set
video
format
to
PAL;
5
．
Press
F2
to
synchronize
to
odd
or
even
field.
Time
base
knob
located
in
the
horizontal
control
area
should
be
used
to
adjust
horizontal
time
base
so
as
to
get
a
clear
waveform
display.
70
