APPLICATION
Signal without undesired component
TIME
MEASUREMENTS
This
is the
procedure
for
making time measurements
between
two
points
on a
waveform.
The
combination
of the
SWEEP TIME/DIV
and the
horizontal distance
in
divisions
between
the two
points
is
used
in the
calculation.
Procedure:
1.
Apply
the
signal
to be
measured
to the
INPUT
con-
nector
and set the V
MODE
to the
channel
to be
used.
Adjust VOLTS/DIV
and
SWEEP TIME/DIV
for a
normal
display.
Be sure that
the
VARIABLE control
is set to CAL
2.
Using
the £
POSITION control
set one of the
points
to
be used
as a
reference
to
coincide with
the
horizontal
centeHine.
Use
the «•
POSITION control
to set
this point
at the
intersection
of any
vertical graduation line.
3. Measure
the
horizontal distance between
the two
point^.
Multiply this
by the
setting
of the A
SWEEP TIME/DIV
control
to
obtain
the
time between
the two
points.
If
horizontal
" x 10 MAG" is
used, multiply this further
by
1/10.
Using
the
formula:
Time
=
Horizontal distance
(div) x
(SWEEP TIME/DIV
setting)
x " x 10 MAG"
value
1
(1/10)
[EXAMPL^]
For
the
example,
the
horizontal distance between
the two
points
is 5.4
divisions.
If
the
SWEEP TIME/DIV
is
0.2ms/div
we
calculate.
Adjust
to
the vertical—j-
scale with •*
•
POSITION
Adjust
to
horizontal
center line with
POSITION
Horizontal distance
Substituting
the
given value:
Time
= 5.4 (div) x 0.2 (ms)=
1.08ms
FREQUENCY
MEASUREMENTS
Frequency measurements
are
made
by
measuring
the
period
of
one
cycle
of
waveform
and
taking
the
reciprocal
of
this
time value
as the
frequency.
Procedure:
1.
Set the
oscilloscope
up to
display
one
cycle
of
waveform
(one
period).
2.
The
frequency
is the
reciprocal
of the
period measured.
Using
the
formula:
^
req
—
period
1
cycle=40jus(5/is/div.x 8div.)
[EXAMPLE]
A period
of 40fis is
observed
and
measured.
Substituting
the
given value:
Freq
=
1/[40x
10
6
] = 2.5x 10
4
= 25 kHz
5-3
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