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by the number of cycles present in the given time span.
If 'x 10 MAG"
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 MAG" value
Horizontal distance (div) x SWEEP TIME/DIV setting
Freq=
Se
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GRRE RNRR
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Count cycles between this portion
Fig. 16
[EXAMPLE]
For the example, within 7 divisions there are 10 cycles.
The SWEEP TIME/DIV is 5 ys. (See Fig. 16)
Substituting the given value:
eq= ——
= 285.7 kHz
7 (div) x 5 (us)
PULSE WIDTH MEASUREMENTS
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 1010).
2. Use the VOLTS/DIV, VARIABLE and ¥ 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 10MAG"
mode is being used.
Using the formula:
Pulse width=
Horizontal distance (div) x (SWEEP TIME/DIV
setting) x ''x MAG 10''value™ (1/10)
22
Adjust to the vertical scale
with <» POSITION
100;
90} ---+4---
Align the waveform
Pulse length
with the center using
{at 50%)
. POSITION
Fig. 17
[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)
xO0.2 ms=0.92 ms
PULSE RISETIME AND FALLTIME MEASUREMENTS
For risetime
and
falltime
measurements,
the
10%
and
90%
amplitude
points are used
as starting and ending
reference points.
Procedure:
1. Apply a signal to the INPUT jack. Set the vertical MODE
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.
2. Using the ¥ POSITION
contro! and the other controls,
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 10%
and 90%
points. Set the VARIABLE to
CAL.
2. Use the <»
POSITION control to adjust the
10% point
to coincide with a vertical graduation line and measure
the distance in divisions between
the 10% and 90%
points on the waveform.
Multiply this by the SWEEP
TIME/DIV and also by 1/10, if ''x 10
MAG"
mode was
used.
NOTE:
Be sure that the correct 10% and 90% lines are used. For
such measurements the 0, 10, 90 and 100% points are
marked on the CRT screen.
Using the formula:
Risetime = Horizontal
distance
(div) x (SWEEP
"TIME/DIV
setting) x ''x 10 MAG"' value" (1/10)
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