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by the number of cycles present in the given time span.
If " x 10 M A G " is used multiply this further by 10.
Note that errors will occur for displays having only a few
cycles.
Using the formula:
# of cycles x " x 10 M A G " value
Freq =
Horizontal distance (div) x SWEEP TIME/DIV setting
Count cycles between this portion
Fig. 16
[EXAMPLE]
For the example, within 7 divisions there are 10 cycles.
The SWEEP TIME/DIV is 5 fis. (See Fig. 16)
Substituting the given value:
10
Freq=
= 2 8 5 . 7 kHz
7 (div) x 5 (/*s)
MEASUREMENTS
PULSE W I D T H
Procedure:
1. Apply the pulse signal to the INPUT jack. Set the vertical
MODE to the channel to be used (unapplied to CS-1020
and 1 0 1 0 ) .
2. Use the VOLTS/DIV, VARIABLE and y POSITION to ad-
just the waveform such that the pulse is easily observed
and such that the center pulse width coincides with the
center horizontal line on the CRT screen.
3. Measure the distance between the intersection of the
pulse waveform and the center horizontal line in divi-
sions. Be sure that the VARIABLE is in the CAL. Multiply
this distance by the SWEEP TIME/DIV and by 1/10 is
" x 10 M A G " mode is being used.
Using the formula:
Pulse width = Horizontal distance (div) x (SWEEP TIME/DIV
setting)x " x M A G I C ' v a l u e
22
[EXAMPLE]
For the example, the distance (width) at the center horizon-
tal line is 4 . 6 divisions and the SWEEP TIME/DIV is 0.2 ms.
(See Fig. 17)
Substituting the given value:
Pulse width = 4 . 6 (div) x 0.2 ms = 0 . 9 2 ms
PULSE RISETIME AND FALLTIME MEASUREMENTS
For risetime and falltime measurements, the 1 0 % and
9 0 % amplitude points are used as starting and ending
reference points.
Procedure:
1. Apply a signal to the INPUT jack. Set the vertical MODE
2. Using the
2. Use the
NOTE:
Be sure that the correct 1 0 % and 9 0 % lines are used. For
such measurements the 0, 10, 9 0 and 1 0 0 % points are
(1/10)
- 1
marked on the CRT screen.
Using the formula:
Risetime = Horizontal
Adjust t o the vertical scale
w i t h
Pulse length
(at 5 0 % )
Fig. 17
to the channel to be used (unapplied to CS-1020 and
1010).
Use the VOLTS/DIV
and VARIABLE to adjust the
waveform peak-to-peak height to six divisions.
POSITION control and the other controls,
T
adjust the display such that the waveform is centered
vertically in the display. Set the SWEEP TIME/DIV to as
fast a setting as possible consistent with observation of
both the 1 0 % and 9 0 % points. Set the VARIABLE to
CAL.
POSITION control to adjust the 1 0 % point
to coincide w i t h a vertical graduation line and measure
the distance in divisions between the 1 0 % and 9 0 %
points on the waveform. Multiply this by the SWEEP
TIME/DIV and also by 1/10, if " x 10 M A G " mode was
used.
distance
setting) x " x 10 M A G " value"
POSITION
Align the w a v e f o r m
w i t h the center using
POSITION
(div) x (SWEEP
TIME/DIV
(1/10)
1
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