l
J
l
l
l
l
J
l
EXAMPLE:
The
horizontal
difference
is 0.6
division
with
a sweep rate
of
45°
/division
as
shown
in Fig.
23.
Using the formula:
Phase
Difference
horizontal
difference
divisions
Substituting
the given values:
X sweep
(degrees/div)
Phase Difference
= 0.6 X 45° = 27°.
HIGH
RESOLUTION PHASE
DIFFERENCE MEASUREMENTS
Make more accurate phase measurements
by
in-
creasing
the
sweep rate
(without
changing
the A VAR
TIME/DIV
control)
by
using
the
X10
MAG
mode. Delayed
sweep
magnification
may also
be
used (see Fig. 24).
EXAMPLE: If the sweep rate were increased
10
times
with
the magnifier, the magnified sweep rate
would
be 45°
-;-
10 = 4.5°
/division.
Fig.
24
shows the same signals
as
used in Fig. 23
but
with
the X10
MAG
switch
set
to
X10.
I
I
100
90
CHANNELl
(REFERENCE)
I
,..._,_
J
-
'
----©)
0
I
0
..
....
I
~
I
I I
· · · ·
CHANNEL
2 · · · ·
I
I
I
®-
J
-
-
...
.
...
.
...
....
HORIZONTAL
----
DIFFERENCE
----
Fig.
24.
High-resolution phase difference.
MEASURE
TIME
FROM
ATOB
1737-21
With a horizontal difference
of
6 divisions, the phase
difference is:
Phase
Difference
horizontal
difference
(divisions)
Substituting the given values:
magnified
X sweep rate
(degrees/div)
Phase Difference
= 6 X 4.5° = 27°.
@
466/464 DM44 Operators
47
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