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Signal without undesired component
Fig. 14
T I M E M E A S U R E M E N T S
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. Adjust the
VOLTS/DIV and SWEEP TIME/DIV for a normal display.
Be sure that the VARIABLE control is set to C A L posi-
tion.
2. Using the T POSITION control, set one of the points to
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 between the
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-
t i n g ) x " x 10 M A G " v a l u e
1
•Adjust to the vertical scale
with
POSITION
Horizontal distance
Fig. 15
POSITION control to set this
two
(1/10)
Adjust to horizontal
center line with
A POSITION
[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. 15)
Substituting the given value:
Time = 5 . 4 (div) x 0 . 2 (ms) = 1.08 ms
F R E Q U E N C Y M E A S U R E M E N T S
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=
-
period
4(tys
(5/ts/div.
1 cycle =
Fig. 16
[EXAMPLE]
A period of 4 0 its is observed and measured. (See Fig. 16)
Substituting the given value:
F r e q = 1 / [ 4 0 x 1 0 "
6
] = 2 . 5 x 1 0
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. Select the vertical
MODE to the channel to be used and adjusting the
various controls for a normal display. Set the VARIABLE
control to C A L position.
2. Count the number of cycles of waveform between a
chosen set of vertical graduation lines.
display one cycle of
x 8 div.)
4
= 2 5 kHz
19
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