Specifications

CHOP
is more suitable
for low-frequency signals.
The
reference signal
should
precede
the comparison signal
in time.
4. lt the
signals
are
of opposite
polarity,
set
the
INVERT switch
to
invert the
Channel 2
display.
5.
Set
the CH
1 and
CH 2
VOLTS/DlV switches
and the
CH
1 and CH
2
VAR controls
to
produce
displays
that
are
equal
in
amplitude.
Measure the
horizontal difference
between
cor-
responding
points
on
the waveforms
at
a common
horizontal
graticule
line
(at
50%
of
risetime) and
cal-
culate the
phase
difference
using
the
following
formula:
8.
Phase
horizontal
Difference
=
difference
X
(degrees)
(divisions)
sweep
rate
(degrees/div)
6. Use
vertical
position
controls
both
signals around
the
center
line.
to
vertically center
horizontal
graticule
7.
Set
the
TIME/DlV
switch
to show
about
one
cycle
of
the
waveform.
Position
the
display and
adjust
the
VAR
TIME/DlV
control to
place
one
reference
signal
cycle
in
exactly
eight
divisions
at
the 50%
risetime
points
(see
Figure 21!'.
Each division
of
the
graticule
now
represents
45o of the
cycle
{360'
+
I
divisions)
and
the sweep
rate can
be stated
as
45oldivision.
@
CHANNEL 1
(REFERENCE)
CHANNEL
2
(LAGGING)
I
^
A.r r.^r^rt^
|
MEASURE
TIME FROM
ATOB
HORIZONTAL
DIFFERENCE
465/DM-0-1s
4658/DM44
Operators
Figure
21.
Phase difference.
53