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R e a d m e a s u r e m e n t s w h e n A F T . D B s w e e p t r a c e s ©
t o s a m e p o s i t i o n
P u l s e T i m e D i f f e r e n c e u s i n g D e l a y e d
[EXAMPLE]
In the example s h o w n in Fig. 5 8 , if the first measure-
ment is 0 . 7 8 4 (is and the second measurement is
6 . 1 6 4 fis.
Repetition time = 6 . 1 6 4 - 0 . 7 8 4 = 5 . 3 8 / u s
20. RISE AND FALL TIME MEASUREMENT
USING DELAYED SWEEP
(1) Normal Procedures
The rise time and fall time are determined based on time
between the 1 0 % and 9 0 % amplitude points.
1)
Apply the signal to the input connector. Select the chan-
nel to be used with the V E R T I C A L MODE s w i t c h . A d -
just the w a v e f o r m peak-to-peak height to 5 divisions
w i t h the V O L T S / D I V and V A R I A B L E controls.
2)
Adjust each control for normal s w e e p display. Center
the waveform with the • POSITION control. Set the
S W E E P T I M E / D I V to a s fast point as possible. Set the
A S W E E P T I M E to C A L .
3)
Select A INT B of the H O R I Z O N T A L MODE s w i t c h e s ,
and set the B S O U R C E to A F T . D . Adjust the B S W E E P
T I M E / D I V to minimize the intensity-modulation
4)
Adjust the D E L A Y POSITION so that the 1 0 % point on
the waveform is intensity-modulated. Make a record of
the measurement following D E L A Y in the upper right
of the C R T .
5)
T h e n , adjust the D E L A Y POSITION so that the 9 0 %
point on the w a v e f o r m is intensity-modulated.
The rise time and fall time can be determined by sub-
tracting the first measurement from the second meas-
urement.
Rise (fall) time =
2nd measurement - 1 s t measurement
40
a n d ®
a r e a d j u s t e d
1 s t
" m e a s u r e m e n t
2 n d
m e a s u r e m e n t
S w e e p
Fig. 58
part.
1 s t s e t t i n g
R i s e t i m e
Fig. 59
[EXAMPLE]
In the example s h o w n in Fig. 5 9 , the first measurement
( 1 0 % point) is 2 . 1 8 0 /xs and the second measurement
( 9 0 % point) is 1 4 . 3 5 2 fis,
Rise time = 1 4 . 3 5 2 -
2 1 . TIME DIFFERENCE MEASUREMENT USING
DELAYED SWEEP
Using the delayed s w e e p operation, time difference of sig-
nals synchronized with each other can be measured ac-
curately.
1)
Apply the t w o signals to the C H 1 and C H 2 input con-
nectors. Select C H 1 and C H 2 as well as A L T or CHOP
of the V E R T I C A L MODE s w i t c h e s .
2)
Adjust each control for normal s w e e p display. Select
the faster of the t w o signals a s the A S O U R C E (refer-
ence signal), and adjust 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 proper w a v e f o r m display.
Set the A S W E E P T I M E to C A L .
3)
Select A INT B of the H O R I Z O N T A L MODE s w i t c h e s ,
and set the B T R I G G E R I N G S O U R C E to A F T . D . Adjust
the intensity-modulation part w i t h the B S W E E P T I M E /
DIV. Adjust the ARFF or D E L A Y POSITION so that the
intensity-modulation part coincides with the leading (or
trailing) edge of the reference pulse.
4)
Select A L T of the H O R I Z O N T A L MODE s w i t c h e s . A d -
just the B s w e e p trace to an easy-to-see point with the
T R A C E S E P control.
5)
Adjust the D E L A Y POSITION so that the correspond-
ing part of the comparison signal is set to the same seg-
ment of the vertical graduation line.
Time difference can be determined by subtracting the
measurement of the reference signal displayed follow-
ing D E L A Y in the upper right of the C R T from meas-
urement of the comparison signal displayed following
D E L A Y .
Time difference =
Measurement of comparison signal
-
measurement of reference signal
2 n d
m e a s u r e m e n t
1 s t m e a s u r e m e n t
- 2 n d
s e t t i n g
2 . 1 8 0 = 1 2 . 1 7 2 its
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