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Signal w i t h o u t undesired component
Fig. 13
MEASUREMENTS
T I M E
This is the procedure for making time measurements be-
tween t w o points on a waveform. The combination of the
SWEEP TIME/DIV and the horizontal distance in divisions
between the t w o 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 t o be used (unapplied
to C S - 1 0 2 0 and 1 0 1 0 ) . 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 t o
be used as a reference to coincide with the horizontal
centerline. Use the < •
point at the intersection of any vertical graduation line.
3. Measure the
horizontal distance
points.
Multiply this by the setting of the SWEEP TIME/DIV con-
trol to obtain the time between the t w o 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 " x 10 M A G " v a l u e
1
Adjust to the vertical scale
w i t h
POSITION
Horizontal distance
Fig. 14
POSITION control to set this
between the
t w o
(1/10)
Adjust t o horizontal
center line w i t h
POSITION
[EXAMPLE]
For the example, the horizontal distance between the t w o
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
waveform (one period).
2. The frequency is the reciprocal of the period measured.
Using the formula:
Freq=
1
period
1 cycle = 40/*s ( 5 / * s / d i v . x 8 div.)
Fig. 15
[EXAMPLE]
A period of 4 0 us is observed and measured. (See Fig. 1 5)
Substituting the given value:
F r e q = 1 / [ 4 0 x 1 0 "
] = 2 . 5 x 1 0
6
While the above method relies on the measurement 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 CS-1020
and 1010) and adjusting the various controls for a nor-
mal display. Set the VARIABLE to CAL.
2. Count the number of cycles of waveform between a
chosen set of vertical graduation lines.
Using the horizontal distance between the vertical lines
used above and the SWEEP TIME/DIV, the time span
may be calculated. Multiply the reciprocal of this value
display
one cycle
of
= 25 kHz
4
21
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