Risetime
Risetime measurements use the same methods as time-dura
tion measurements, except the measurements are made be
tween the 10% and 90% points of the waveform. Falltime
is measured between the 90% and 10% points on the trailing
edge of the waveform.
Use a sweep speed setting that displays several cycles or
events (if possible) and be sure the HORIZ MGF VAR con
trol is in the calibrated detent. Set the VOLTS-mA/DIV
and VOLTS-mA/DIV VAR controls (or signal amplitude)
for exactly a 5 division display. Set vertical positioning so
the display bottom crosses the midpoint of the bottom
graticule division and the display top crosses the midpoint
of the top graticule division (see Fig. 14).
_,I
�
""
/
/
�
V
L
10%
POINT
I
I
I
[__HORIZONTA�
i
DISTANCE
1
I
:
Fig. 14. Risetime.
-
-
90%
-POINT
1480-1
Set the SEC/DIV control for a single-event display and hori
zontally position the display to the 10% point of the wave
form intersects the second vertical graticule line (see Fig. 14).
Using the time duration formula to find risetime:
Measure the horizontal distance between the 10% and 90%
points and multiply the distance measured by the SEC/DIV
control setting.
EXAMPLE: The horizontal distance between the 10% and
90% points is 4 divisions and the SEC/DIV control is set to
2µ.
Time
Duration
(risetime)
Substituting:
26
213 Operators
horizontal
distance
(divisions)
4
X
2 µ
X
8
µs
SEC/DIV
setting
REV. A, MAR. 1975
Summary of Contents for 200 Series
Page 1: ...213 DMM OSCILLOSCOPE WITH OPTIONS OPERATORS ...
Page 2: ... ...
Page 8: ...213 DMM Oscilloscope 213 Operators ...
Page 52: ......
Page 54: ......
Page 55: ... ...
Page 56: ......