Rise time
[EXAMPLE]
For the example, the horizontal distance is 4.0 divisions.
The SWEEP TIME/DIV is 2 ps. (See Fig. 18)
Substituting the given value:
Risetime = 4.0 (div)x2 (/is) = 8/ns
Risetime and falltime can be measured by making use of
the alternate step 3 as described below as
well.
4.
Use the o POSITION control to set the 10% point to
coincide with the center vertical graduation line and
measure the horizontal distance to the point of the in-
tersection of the waveform with the center horizontal
line.
Let this distance be D
v
Next adjust the waveform
position such that the 90% point coincides with the ver-
tical centerline and measure the distance from that line
to the intersection of the waveform with the horizontal
centerline. This distance is D
2
and the total horizontal
distance is then Dj plus D
2
for use in the above relation-
ship in calculating the rise time or falltime.
[EXAMPLE]
For the example, the measured D
x
is 1.8 divisions while D
2
is 2.2 divisions. If SWEEP TIME/DIV is 2 (is we use the
following relationship. (See Fig. 19)
Substituting the given value:
Risetime = (1.8+ 2.2) (div)x2 (/*s) = 8
/AS
TIME DIFFERENCE MEASUREMENTS (Unapplied to
CS-1020 and 1010)
This procedure is useful in measurement of time
dif-
ferences between two signals that are synchronized to one
another but skewed in time.
Procedure:
1.
Apply the two signals to CH1 and CH2 INPUT jacks. Set
the vertical MODE to either ALT or CHOP mode.
Generally for low frequency signals CHOP is chosen
with ALT used for high frequency signals.
2.
Select the faster of the two signals as the SOURCE and
use the VOLTS/DIV and SWEEP TIME/DIV to obtain an
easily observed display.
Set the VARIABLE to CAL.
3. Using the t POSITION control set the waveforms to the
center of the CRT display and use the <«• POSITION
control to set the reference signal to be coincident with
a vertical graduation line.
4.
Measure the horizontal distance between the two
signals and multiply this distance in divisions by the
SWEEP TIME/DIV setting.
If "x10 MAG" is being used multiply this again by 1/10.
Using the formula:
Time = Horizontal distance (div) x (SWEEP TIME/DIV
setting) x " x 10 MAG" value"
1
(1/10)
Using the formula:
Risetime = (D
t
+ D
2
) (div) x (SWEEP TIME/DIV
setting)x"x 10 MAG" value
1
(1/10)
[EXAMPLE]
For the example, the horizontal distance measured is 4.4
divisions. The SWEEP TIME/DIV is 0.2 ms. (See Fig. 20)
Substituting the given value:
Time = 4.4 (div)x0.2 (ms) = 0.88 ms
Time difference
Fig.
20
23
Adjust to the vertical scale
" with POSITION
Fig.
18
Adjust 90% point to the center
and measure D
2
.
Rise time
Fig.
19
Adjust 10% point
"to the center and
measure D
t
.
- Reference signal
Comparison signal
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