APPLICATION
[EXAMPLE]
For the example, the horizontal distance is 4.0 divisions.
The SWEEP TIME/DIV is 2
M
s.
Substituting the given value:
Risetime = 4.0 (div) x 2 (/is) = 8/IS
Risetime and falltimes can be measured by making use of
the alternate step 3' as described below as
well.
4.
Use the 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
intersection of the waveform with the center horizontal
line.
Let this distance be Di. Next adjust the waveform
position such that the 90% point coincides with the
vertical centerline and measure the distance from that
line to the intersection of the waveform with the ho-
rizontal centerline. This distance is D2 and the total ho-
rizontal distance is then Di plus D2 for use in the above
relationship in calculating the risetime or falltime.
Using the formula:
Risetime = (D1 + D2) (div) x (SWEEP TIME/DIV setting)
x " x 10 MAG" value
1
+i/10)
[EXAMPLE]
For the example, the measured Di is 1.8 divisions while D
2
is 2.2 divisions. If SWEEP TIME/DIV is 2/is we use the
fol-
lowing relationship
Substituting the given value:
Risetime = (1.8 + 2.2) (div) x 2 (ns)= 8/is
TIME DIFFERENCE MEASUREMENTS
This procedure is useful in measurement of time differences
between two signals that are synchronized to one another
but skewed in time.
Procedure:
1.
Apply the two signals to CH1 and CH2 and set the V
MODE to DUAL choosing 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 VOLTS/DIV and SWEEP TIME/DIV to obtain an
easily observed display.
Set A VAR to CAL.
3. Using * 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
sig-
nals and multiply this distance in divisions by the
SWEEP TIME/DIV setting.
If x 10 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)
[EXAMPLE]
For the example, the horizontal distance measured is 4.4
divisions. The SWEEP TIME/DIV is 0.2ms.
Substituting the given value:
Time= 4.4 (div) x 0.2(ms) = 0.88ms
5-5
Adjust to the vertical scale
with POSITION -
-Rise time
Adjust 90% point to the center
and measure
D2.
Rise time
-Adjust 10% point
to the center and
measure Di.
Referance signal
-Comparison signal
Time differencer
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