Trio CS-1040, Instruction Manual, Page: 21 / 35

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 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 to be used. Adjust the
VOLTS/DIV and SWEEP TIME/DIV for a normal display.
Be sure that the VARIABLE control is set to CAL 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 < • POSITION control to set this
point at the intersection of any vertical graduation line.
3. Measure the horizontal distance between the t w o
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
(1/10)
[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. 19)
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 display one cycle of
waveform (one period).
2. The frequency is the reciprocal of the period measured.
Using the formula:
Freq = -
period
Adjust to horizontal
center line with
A' POSITION
•
[EXAMPLE]
A period of 4 0 /JLS 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
4
= 25 kHz
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 CAL position.
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
2 1
Signal without undesired component
Fig. 18
1 cycle = 40/ts (5/ts/div. x 8 div.)
Fig. 20
•Adjust to the vertical scale
with
o
POSITION
Horizontal distance
Fig. 19