Basic
Applications-2230
Operator$
Rise
Time
horizontal distance A SEC/DIV
(divisions) X switch setting
magnification factor
EXAMPLE: The horizontal distance between the 10%
and 90% points is 5 divisions (see Figure 6-22), and the
A SEC/DIV switch is set to 1 µs. The X10 magnifier
knob
is
pushed
in
(1
X magnification).
Substituting the given values
in
the formula:
Rise Time = 5 div X 1 µS/div = 5
µS
1
TIME DIFFERENCE BETWEEN
TWO
TIME-RELATED PULSES
The calibrated sweep speed and dual-trace features of
the instrument allow measurement
of
the time difference
between
two
separate events. To measure time difference,
use the following procedure:
1 . Preset instrument controls and obtain a baseline
trace.
2.
Set the A TRIGGER A&B INT switch to
CH
1.
3. Set both AC-GND-DC switches to the same posi-
tion, depending on the type of input coupling desired.
4.
Using either probes or cables with equal time
delays, connect a known reference signal to the Channel 1
input and the comparison signal to the Channel 2 input.
5.
Set both VOL TS/DIV switches for
4-
or 5-division
displays.
6.
Select BOTH VERTICAL MODE; then select either
ALT or CHOP, depending on the frequency of the input
signals.
7.
Adjust the A TRIGGER LEVEL control for a stable
display.
6-22
8.
Set the A SEC/DIV switch to a sweep speed which
provides three or more divisions of horizontal separation
between the reference points
on
the two displays. Center
each of the displays vertically (see Figure 6-23).
CHANNEL 1 (REFERENCE)
~~
L--L--.C
i i
1~0
· · · · · · · ·
00
I
50%
AMPLITUD
LEVEL
E......_
r
'~
I
01'.··
I I
I I
l5.0mi
i-+
l'-..1
I
' I
'-A
I
I
I
c;vl
G
!
-:f
...
B..._
f
i
1
HORIZONTAL
DIFFERENCE
I
,...
1
CHANNEL 2
I
/
JL
'
~+
'
'
le:,,~
i
i-
l
i
I
M EASURE
ME FROM Tl
A
@To@
I
I
4998-36
Figure 6-23. Time difference between two time-related pulses.
9.
Measure the horizontal difference between the
two
signal-reference points and calculate the time difference - -
using the following formula:
Time
Difference
A SEC/DIV horizontal difference
switch setting X (divisions)
magnification factor
EXAMPLE: The A SEC/DIV switch is set to 50
µS,
the
X10 magnifier knob is pulled out, and the horizontal
difference between waveform measurement points
is
4.5 divisions.
Substituting the given values
in
the formula:
Time Difference =
50
µs/div X
4
·
5
div = 22.5
µs
10
To Next Page
Loading...
Need help?
General
