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Signal without undesired component
Fig. 13
TIME MEASUREMENTS
This is the procedure for making time measurements
be-
tween 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 jack. Set
the vertical MODE to the channel to be used (unapplied
to CS-1020
and
1010).
Adjust the 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
centerline.
Use the <»
POSITION
control to set this
point atthe intersection of any vertical graduation line.
3. Measure
the
horizontal
distance
between
the
two
points.
Multiply this by the setting of the SWEEP TIME/DIV con-
trol 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
set-
ting) x '' x10 MAG" value™! (1/10)
Adjust to the vertical scale
with «> POSITION
Adjust to horizontal
Horizontal distance
center line with
4
POSITION
Fig. 14
y
[EXAMPLE]
For the example, the horizontal distance between the two
points is 5.4 divisions.
If the SWEEP
TIME/DIV is 0.2 ms/div we calculate. (See
Fig. 14)
Substituting the given value:
Time = 5.4 (div) x 0.2 (ms)=1.08 ms
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:
F
=
ra
period
1 cycle=40us (5yus/div. x 8 div.)
Fig. 15
[EXAMPLE]
A period of 40 ys is observed and measured. (See Fig. 15)
Substituting the given value:
Freq = 1/[40 x 10°*] = 2.5 x 104= 25 kHz
While the above method relies on the measuremer
directly
of the period of one
cycle, the frequency
may
also be
measured
by counting the number of cycles present in a
given time period.
1. Apply the signal to the INPUT
jack.
Set the
vertical
MODE to the channel to be used (unapplied to ¢ S-1020
and 1010) and adjusting the various controls jr a nor-
mal display. Set the VARIABLE to CAL.
2. Count the number
of cycles of waveform
be ween
a
chosen set of vertical graduation lines.
Using the horizontal distance between the verjcal lines
used above and the SWEEP
TIME/DIV,
the tnne span
may be calculated. Multiply the reciprocal of tis value
21
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