I
I
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I
I
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5.
Measure
the horizontal difference between the
two
signals
and
calculate the time difference using the
following formula:
Time
Difference
TIME/DIY
horizontal
switch X difference
setting (divisions)
magnification
EXAMPLE: The
TIME/DIY
switch
is
set
to
50
JlS,
the
MAG switch
to
X10,
and
the horizontal difference between
waveforms
is
4.5 divisions
(see
Figure 20).
Substituting the given values:
Time
Difference
50 Jls/division X 4.5 divisions
10
= 22.5
JlS
TIME COMPARISON
Repetitious time comparisons
of
unknown
signals
with
a reference signal (e.g., on assembly line test) may
be
easily
and accurately made using the 4658.
To
accomplish this a
reference signal
of
known time duration
is
first
set
to
an
exact number
of
horizontal divisions by adjusting the
TIME/DIY
and the
YAR
TIME/DIY
controls. Unknown
signals
can
then
be
quickly
and accurately compared
with
the reference
signal
without
disturbing the setting
of
the
YAR
TIME/DIY
control. The procedure
is
as
follows:
1.
Set the time duration
of
the reference
signal
to
an
exact number
of
horizontal divisions by adjusting the
TIME/DIY
and
YAR
TIME/DIY
controls.
2.
Establish a horizontal conversion factor, using the
following formula (reference signal time duration
must
be
known):
Horizontal
Conversion
Factor
reference signal time duration
(seconds)
horizontal
TIME/DIY
deflection X switch
(divisions)
setting
3. For the unknown signal, adjust the
TIME/DIY
switch
to
a setting that provides sufficient horizontal
deflection
to
make
an
accurate measurement. Do
not
readjust the
YAR
TIME/DIY
control.
4. Establish
an
arbitrary deflection factor, using the
following formula:
Arbitrary
Deflection
Factor
Horizontal
Conversion
Factor
X
TIME/DIY
switch
setting
@
465B/DM44
Operators
51
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