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3)
Adjust the 1 0 % point to a vertical graduation line with
the
POSITION control. Measure the horizontal dis-
tance between the 1 0 % and 9 0 % points. Multiply this
horizontal distance by the S W E E P T I M E / D I V setting.
N O T E : T h e C R T provides graduation lines representing
0, 1 0 , 9 0 , and 1 0 0 % , where 5 divisions =
1 0 0 % . These lines should be used for this meas-
urement.
Rise time = Horizontal distance (div) x S W E E P
T I M E setting
A l i g n t o v e r t i c a l g r a d u a t i o n line
w i t h <+ •
P O S I T I O N
R i s e t i m e
Fig. 3 8
[ E X A M P L E ]
In the example s h o w n in Fig. 3 8 , measured horizontal
distance is 3 . 3 divisions. If S W E E P T I M E / D I V setting
is 2 /is/div,
Rise time = 3 . 3 (div) x 2 (/is/div) = 6 . 6 ps
Rise time and fall time can also be measured by chang-
ing item 3) above as follows:
4)
Adjust the 1 0 % point to the center vertical graduation
line w i t h the
P O S I T I O N , and measure the horizon-
tal distance to the point that crosses the center horizon-
tal line. Let this distance be D i . T h e n , adjust the 9 0 %
point to the center vertical graduation line with the
P O S I T I O N , and measure the horizontal distance to a
point that crosses the horizontal graduation line like-
w i s e . Let this distance be D2.
The total horizontal distance is then Di + D2. Multiply
this total distance by the S W E E P T I M E / D I V setting.
Rise time = (Di + D
x S W E E P T I M E / D I V setting
•
)(div)
2
C e n t e r 9 0 % p o i n t
< •
P O S I T I O N t o r e a d D
R i s e t i m e
Fig. 3 9
[ E X A M P L E ]
In the example s h o w n in Fig. 3 9 , the measured Di is
1.6 divisions while D
2
T I M E / D I V setting is 2 /xs,
Rise time = ( 1 . 6 + 1 . 4 ) ( d i v ) x 2 (ps/div) = 6 fis
1 2 ) Cursor Measurement Procedures
1)
Adjust amplitude of the displayed w a v e f o r m to 5 divi-
sions through the normal procedures above. Control the
• POSITION so that the crest and trough of the w a v e
are set to the 0 % and 1 0 0 % points respectively.
2)
Select the AT cursor mode with the C U R S O R S .
3)
Align the AREF cursor to the point where the waveform
to be measured crosses the 1 0 % graduation line and
the zlcursor to the point where the w a v e f o r m crosses
the 9 0 % graduation line.
4)
Measured value is displayed following AT in the upper
right of the C R T .
i R E F c u r s o r
Fig. 4 0
w i t h
2
C e n t e r
1 0 %
p o i n t
w i t h
•4 •
P O S I T I O N
t o r e a d D ,
is 1.4 divisions. If S W E E P
M e a s u r e d v a l u e - ^
c u r s o r
35
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