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Use the V O L T S / D I V and V A R I A B L E controls to adjust
the waveform peak-to-peak height to six divisions.
2. Set each control for a normal display, and adjust the
$
P O S I T I O N
control such that the waveform
centered vertically
in the display.
T I M E / D I V control to the maximum speed to the extent
the
10% and
90% points
V A R I A B L E control to C A L .
3. Use the O
P O S I T I O N control to adjust the 10% point
to coincide with a vertical graduation line, and measure
the horizontal distance in divisions between the 10% and
90%
points on the waveform.
S W E E P T I M E / D I V setting, and also by 1/10 if " x 1 0
M A G " is used.
N O T E :
The
C R T screen has graduation lines representing 0 ,
10, 9 0 and 100%, where 6 div = 100%. These lines
should be used for this measurement.
Risetime = Horizontal distance (div) x ( S W E E P T I M E / D I V
s e t t i n g ) x " x 10 M A G " value"
A d j u s t t o t h e v e r t i c a l s c a l e
w i t h
P O S I T I O N
R i s e t i m e
Fig. 2 1
[ E X A M P L E ]
For the example shown in F i g . 2 1 , the horizontal distance
is 4.0 divisions.
Suppose the S W E E P T I M E / D I V setting is 2 jus.
Risetime = 4.0 (div) x 2 (jus) = 8jus
Risetime and falltime can also be measured by changing
step 3 above as follows:
4. Use the <«• P O S I T I O N control to set the 10% point to
coincide with the center vertical graduation line, and
measure the horizontal distance to the point that crosses
the center horizontal line. L e t this distance be D i . Next
adjust the waveform position such that the 90% point
coinsides with the vertical centerline, and measure the
horizontal distance from that line to the point that
crosses horizontal centerline.
is
Set the S W E E P
are observable. Set the
Multiply this by the
1
( 1 / 1 0 )
Let this distance be D
.
2
The total horizontal distance is then D
ply the total distance by the S W E E P T I M E / D I V setting
and the reciprocal of " x 10 M A G " setting.
Risetime = ( D
+ D
) (div)x ( S W E E P T I M E / D I V setting) x " x
1
2
10 M A G " value*
1
(1/10)
A d j u s t 9 0 % p o i n t t o t h e c e n t e r
a n d m e a s u r e D
R i s e t i m e
Fig. 22
[ E X A M P L E ]
For the example shown in Fig. 2 2 , the measured D
divisions while D
is 2.2 divisions. If S W E E P T I M E / D I V
2
setting is 2 jus, then
Risetime = (1.8 + 2.2) (div) x 2 (/lis) = 8/is
TIME D I F F E R E N C E MEASUREMENTS
This procedure is useful in measurement of the time differ-
ences between two signals that are synchronized to each
other.
Procedure:
1. Apply the two signals to channel 1 and channel 2 IN-
P U T jacks, and select the vertical M O D E switch to
D U A L by choosing either A L T or C H O P mode.
Generally, C H O P is chosen for low frequency signals
with A L T used for high frequency signals.
2. Set each control for a normal display. Select the faster
of the two signals as the S O U R C E , and use the V O L T S /
D I V
and S W E E P T I M E / D I V controls to obtain an
easily observable display.
Set the V A R I A B L E control to C A L .
3. Using each ^ P O S I T I O N control, set the waveforms to
the center of the C R T display. Then use the ~ < o ~
T I O N 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
S W E E P T I M E / D I V setting.
multiply this further by 1/10.
plus D
. Multi-
x
2
2
A d j u s t 1 0 % p o i n t t o t h e
c e n t e r a n d m e a s u r e D i
is 1.8
A
P O S I -
If " x 10 M A G " is used,
27
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