Table of Contents
Advertisement
Signal w i t h o u t undesired component
Fig. 13
TIME MEASUREMENTS
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 t o be measured t o the INPUT jack. Set
the vertical MODE t o 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 t o CAL.
2. Using the • POSITION control, set one of the points t o
be used as a reference to coincide w i t h 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 t o 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 t o the vertical scale
w i t h
POSITION
Horizontal distance
Fig. 1 4
POSITION control t o set this
t w o
(1/10)
Adjust t o horizontal
center line w i t h
A
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 w e 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 t o
waveform (one period).
2. The frequency is the reciprocal of the period measured.
Using the formula:
Freq — — - — -
period
1 cycle = 40/iS (5/is/div. x 8 div.)
Fig. 15
[EXAMPLE)
A period of 4 0 /is is observed and measured. (See Fig. 15)
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 t o the channel t o be used and adjusting the
various controls for a normal 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
= 2 5 kHz
4
19
Advertisement
Table of Contents
