Specifications

Measure the
horizontal
difference
between the
two
signals
and
calculate
the
time
difference
using the
following
formula:
TIME/DlV
horizontal
switch
X difference
Time
=
setting
(divisions)
Difference
magnification
EXAMPLE:
The
TIME/DlV
switch
is set to 50ps,
the
MAG switch
to
Xl0,
and
the
horizontal
difference
between
waveforms
is 4.5 divisions
(see
Figure
20).
Substituting
the
given
values:
Time
_
50
psldivision
I
4.5 divisions
=
22.5
tts
Difference
10
TIME COMPARISON
Repetitious
time
comparisons of
unknown signals
with
a
reference signal
(e.9.,
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/DlV
and
the
VAR TIME/DlV
controls. Unknown
signals
can then be
quickly
and
accurately compared with
the
reference signal
without disturbing
the
setting of the
VAR
TIME/DIV control.
The
procedure
is
as
follows:
1. Set
the time
duration of
the
reference
signal
to an
exact
number
of
horizontal divisions by adiusting
the
TIME/DlV and
VAR
TIME/DlV controls.
2.
Establish
a
horizontal conversion
factor,
using the
following
formula
(reference
signal time
duration
must
be known):
5.
Horizontal
Conversion
=
Factor
Arbitrary
Deflection =
Factor
horizontal
def
lection
(divisions)
Horizontal
Conversion
X
Factor
TIME/D
IV
X
switch
setting
TIME/D
IV
switch
setting
reference signal time
duration
(seconds)
3.
For
the
unknown signal, adjust the TIME/DlV switch
to
a setting that
provides
sufficient
horizontal
deflection to
make
an accurate
measurement.
Do
not
readjust the VAR TIME/DlV
control.
4.
Establish
an
arbitrary
deflection
factor, using
the
following
formula:
@
4658/DM44
Operators
51