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Signal without undesired component
Fig. 1 8
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 • 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
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-
1
t i n g ) x " x 1 0 M A G " v a l u e
1 cycle = 40/ts (5/ts/div. x 8 div.)
Fig. 20
POSITION control to set this
distance between the
two
(1/10)
[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. 19)
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 =
period
Adjust to the vertical scale
with
POSITION
Horizontal distance
Fig. 19
[EXAMPLE]
A period of 4 0 /*s is observed and measured. (See Fig. 20)
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. Set 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.
display one cycle of
Adjust t o horizontal
center line with
A P O S I T I O N
4
= 25 kHz
2 1
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